Relevant bibliographies by topics / Quantum coherent communications

Academic literature on the topic 'Quantum coherent communications'

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Published: 1 June 2024

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Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Journal articles on the topic "Quantum coherent communications":

1

Djordjevic, Ivan B. "LDPC-Coded Optical Coherent State Quantum Communications." IEEE Photonics Technology Letters 19, no. 24 (December 2007): 2006–8. http://dx.doi.org/10.1109/lpt.2007.909688.

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Sidhu, Jasminder S., Michael S. Bullock, Saikat Guha, and Cosmo Lupo. "Linear optics and photodetection achieve near-optimal unambiguous coherent state discrimination." Quantum 7 (May 31, 2023): 1025. http://dx.doi.org/10.22331/q-2023-05-31-1025.

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Coherent states of the quantum electromagnetic field, the quantum description of ideal laser light, are prime candidates as information carriers for optical communications. A large body of literature exists on their quantum-limited estimation and discrimination. However, very little is known about the practical realizations of receivers for unambiguous state discrimination (USD) of coherent states. Here we fill this gap and outline a theory of USD with receivers that are allowed to employ: passive multimode linear optics, phase-space displacements, auxiliary vacuum modes, and on-off photon detection. Our results indicate that, in some regimes, these currently-available optical components are typically sufficient to achieve near-optimal unambiguous discrimination of multiple, multimode coherent states.
3

Эскандери, М. М., Д. Б. Хорошко, and С. Я. Килин. "Безошибочное различение когерентных состояний двухмодового оптического поля." Журнал технической физики 128, no. 8 (2020): 1171. http://dx.doi.org/10.21883/os.2020.08.49716.83-20.

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The procedure of a quantum measurement, the unambiguous state discrimination, is studied for the case of four two-mode coherent states of the optical field, interesting for information transmission via an optical communication channel. It is shown that a complex conjugation of the amplitude of one of the modes results in a better distinguishability of the states. An interferometric scheme is suggested for unambiguous discrimination of such states and the probability of successful discrimination is found. Applications of the considered state set are discussed for quantum cryptography, quantum teleportation and optical communications with a high level of loss.
4

PIRANDOLA, STEFANO. "A QUANTUM TELEPORTATION GAME." International Journal of Quantum Information 03, no. 01 (March 2005): 239–43. http://dx.doi.org/10.1142/s0219749905000815.

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We investigate a game where a sender (Alice) teleports coherent states to two receivers (Bob and Charlie) through a tripartite Gaussian state. The aim of the receivers is to optimize their teleportation fidelities by means of local operations and classical communications. We show that a non-cooperative strategy corresponding to the standard telecloning protocol can be outperformed by a cooperative strategy which gives rise to a novel (cooperative) telecloning protocol.
5

Meddour, H., Sh Askar, S. Dehraj, F. Al-dolaimy, B. S. Abdullaeva, A. Alsaalamy, M. N. Fenjan, A. Alawadi, S. H. Kareem, and D. Thabit. "Efficient two-dimensional Fraunhofer diffraction pattern via electron spin coherence." Laser Physics 33, no. 11 (October 6, 2023): 116003. http://dx.doi.org/10.1088/1555-6611/acfd9a.

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Abstract In this letter, we have discussed the two-dimensional diffraction pattern via electron spin coherence in a GaAs quantum dot. Impulsive stimulated Raman excitation utilizing coherent optical fields is employed for the purpose of regulating the electron spin coherence within a charged ensemble of GaAs quantum dots, by means of an intermediate charged exciton (trion) state. We show that for the coupling two-dimensional standing wave (SW) field in the x and y directions, the two-dimensional Fraunhofer pattern can be formed for a weak probe light. By using the experimental parameters and controlling the Rabi frequency of the SW field and relative phase between applied lights, the symmetry and asymmetry diffraction pattern are obtained for the weak probe light due to the four-wave mixing mechanism. Our proposed model may have potential applications in high-capacity optical communications and quantum information technologies.
6

Becerra, F. E., J. Fan, and A. Migdall. "Photon number resolution enables quantum receiver for realistic coherent optical communications." Nature Photonics 9, no. 1 (November 17, 2014): 48–53. http://dx.doi.org/10.1038/nphoton.2014.280.

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El-Nahal, Fady. "Coherent 16 Quadrature Amplitude Modulation (16QAM) Optical Communication Systems." Photonics Letters of Poland 10, no. 2 (June 30, 2018): 57. http://dx.doi.org/10.4302/plp.v10i2.809.

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Coherent optical fiber communications for data rates of 100Gbit/s and beyond have recently been studied extensively primarily because high sensitivity of coherent receivers could extend the transmission distance. Spectrally efficient modulation techniques such as M-ary quadrature amplitude modulation (M-QAM) can be employed for coherent optical links. The integration of multi-level modulation formats based on coherent technologies with wavelength-division multiplexed (WDM) systems is key to meet the aggregate bandwidth demand. This paper reviews coherent 16 quadrature amplitude modulation (16QAM) systems to scale the network capacity and maximum reach of current optical communication systems to accommodate traffic growth. Full Text: PDF ReferencesK. Kikuchi, "Fundamentals of Coherent Optical Fiber Communications", J. Lightwave Technol., vol. 34, no. 1, pp. 157-179, 2016. CrossRef S. Tsukamoto, D.-S. Ly-Gagnon, K. Katoh, and K. Kikuchi, "Coherent Demodulation of 40-Gbit/s Polarization-Multiplexed QPSK Signals with16-GHz Spacing after 200-km Transmission", Proc. OFc, Paper PDP29, (2005). DirectLink K. Kikuchi, "Coherent Optical Communication Technology", Proc. OFC, Paper Th4F.4, (2015). CrossRef J. M. Kahn and K.-P. Ho, "Spectral efficiency limits and modulation/detection techniques for DWDM systems", IEEE J. Sel. Topics Quantum Electron., vol. 10, no. 2, pp. 259–272, (2004). CrossRef S. Tsukamoto, K. Katoh, and K. Kikuchi, "Coherent demodulation of optical multilevel phase-shift-keying signals using homodyne detection and digital signal processing", IEEE Photon. Technol. Lett., vol. 18, no. 10, pp. 1131–1133, (2006). CrossRef Y. Mori, C. Zhang, K. Igarashi, K. Katoh, and K. Kikuchi, "Unrepeated 200-km transmission of 40-Gbit/s 16-QAM signals using digital coherent receiver", Opt. Exp., vol. 17, no. 32, pp. 1435–1441, (2009). CrossRef H. Nakashima, Et al., "Digital Nonlinear Compensation Technologies in Coherent Optical Communication Systems", Proc. OFC, Paper W1G.5, (2017). CrossRef S. J. Savory, "Digital filters for coherent optical receivers", Opt. Exp., vol. 16, no. 2, pp. 804–817, (2008). CrossRef D. S. Millar, T. Koike-Akino, S. Ö. Arık, K. Kojima, K. Parsons, T. Yoshida, and T. Sugihara, "High-dimensional modulation for coherent optical communications systems", Opt. Express, vol. 22, no. 7, pp 8798-8812, (2014). CrossRef R. Griffin and A. Carter, "Optical differential quadrature phase-shift key (oDQPSK) for high capacity optical transmission", Proc. OFC, Paper WX6, (2002). DirectLink K. Kikuchi, "Digital coherent optical communication systems: fundamentals and future prospects", IEICE Electron. Exp., vol. 8, no. 20, pp. 1642–1662, (2011). CrossRef F. Derr, "Optical QPSK transmission system with novel digital receiver concept", Electron Lett., vol. 27, no. 23, pp. 2177–2179, (1991). CrossRef R. No’e, "Phase noise tolerant synchronous QPSK receiver concept with digital I&Q baseband processing", Proc. OECC, Paper 16C2-5, (2004). DirectLink D.-S. Ly-Gagnon, S. Tsukamoto, K. Katoh, and K. Kikuchi, "Coherent detection of optical quadrature phase-shift keying signals with carrier phase estimation", J. Lightw. Technol., vol. 24, no. 1, pp. 12–21, (2006). CrossRef M. Taylor, "Coherent detection method using DSP for demodulation of signal and subsequent equalization of propagation impairments", IEEE Photon. Technol. Lett., vol. 16, no. 2, pp. 674–676, (2004). CrossRef S. Tsukamoto, K. Katoh, and K. Kikuchi, "Unrepeated transmission of 20-Gb/s optical quadrature phase-shift-keying signal over 200-km standard single-mode fiber based on digital processing of homodyne-detected signal for Group-velocity dispersion compensation", IEEE Photon. Technol. Lett., vol. 18, no. 9, pp. 1016–1018, (2006). CrossRef S. Tsukamoto, Y. Ishikawa, and K. Kikuchi, "Optical Homodyne Receiver Comprising Phase and Polarization Diversities with Digital Signal Processing", Proc. ECOC, Paper Mo4.2.1, (2006). CrossRef K. Kikuchi and S. Tsukamoto, "Evaluation of Sensitivity of the Digital Coherent Receiver", J. Lightw. Technol., vol. 20, no. 13, pp. 1817–1822, (2008). CrossRef S. Ishimura and K. Kikuchi, "Multi-dimensional Permutation Modulation Aiming at Both High Spectral Efficiency and High Power Efficiency", Proc. OFC/NFOEC, Paper M3A.2, (2014). CrossRef F. I. El-Nahal and A. H. M. Husein, "Radio over fiber access network architecture employing RSOA with downstream OQPSK and upstream re-modulated OOK data", (Optik) Int. J. Light Electron Opt., vol. 123, no. 14, pp: 1301-1303, (2012). CrossRef T. Koike-Akino, D. S. Millar, K. Kojima, and K. Parsons, "Eight-Dimensional Modulation for Coherent Optical Communications", Proc. ECOC, Paper Tu.3.C.3, (2013). DirectLink B. Sklar, Digital communications: Fundamentals and Applications, Prentice-Hall, (2001).
8

AWSCHALOM, DAVID D. "CONTROLLING SPIN COHERENCE WITH SEMICONDUCTOR NANOSTRUCTURES." International Journal of Modern Physics B 22, no. 01n02 (January 20, 2008): 111–12. http://dx.doi.org/10.1142/s0217979208046165.

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We present two emerging opportunities for manipulating and communicating coherent spin states in semiconductors. First, we show that semiconductor microcavities offer unique means of controlling light-matter interactions in confined geometries, resulting in a wide range of applications in optical communications and inspiring proposals for quantum information processing and computational schemes. Studies of spin dynamics in microcavities — a new and promising research field — have revealed novel effects such as polarization beats, stimulated spin scattering, and giant Faraday rotation. Here, we study the electron spin dynamics in optically-pumped GaAs microdisk lasers with quantum wells and interface-fluctuation quantum dots in the active region. In particular, we examine how the electron spin dynamics are modified by the stimulated emission in the disks, and observe an enhancement of the spin coherence time when the optical excitation is in resonance with a high quality ( Q ~ 5000) lasing mode.1 This resonant enhancement, contrary to expectations from the observed trend in the carrier recombination time, is then manipulated by altering the cavity design and dimensions. In analogy to devices based on excitonic coherence, this ability to engineer coherent interactions between electron spins and photons may provide novel pathways towards spin dependent quantum optoelectronics. In a second example, the nitrogen-vacancy (N-V) center in diamond has garnered interest as a room-temperature solid-state system not only for exploring electronic and nuclear spin phenomena but also as a candidate for spin-based quantum information processing. Spin coherence times of up to 50 microseconds have been reported for ensembles of N-V centers and a two-qubit gate utilizing the electron spin of a N-V center and the nuclear spin of a nearby C-13 atom has been demonstrated. Here, we present experiments using angle-resolved magneto-photoluminescence microscopy to investigate anisotropic spin interactions of single N-V centers in diamond at room temperature.2 Negative peaks in the photoluminescence intensity are observed as a function of both magnetic field magnitude and angle, and can be explained by coherent spin precession and anisotropic relaxation at spin-level anticrossings. Additionally, precise field alignment with the symmetry axis of a single N-V center reveals the resonant magnetic dipolar coupling of a single "bright" electron spin of an N-V center to small numbers of "dark" spins of nitrogen defects in its immediate vicinity, which are otherwise undetected by photoluminescence. Most recently, we are exploring the possibility of utilizing this magnetic dipole coupling between bright and dark spins to couple two spatially separated single N-V center spins by means of intermediate nitrogen spins. Note from Publisher: This article contains the abstract only.
9

Holevo, A. S., and M. E. Shirokov. "Mutual and coherent information for infinite-dimensional quantum channels." Problems of Information Transmission 46, no. 3 (September 2010): 201–18. http://dx.doi.org/10.1134/s0032946010030014.

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Lu, Z. G., J. R. Liu, Y. X. Mao, K. Zeb, G. C. Liu, J. Webber, M. Rahim, et al. "Quantum dot multi-wavelength lasers for Tbit/s coherent communications and 5G wireless networks -INVITED." EPJ Web of Conferences 238 (2020): 01003. http://dx.doi.org/10.1051/epjconf/202023801003.

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We will present the design, growth, fabrication, electronic control and packaging of the InAs/InP quantum dot (QD) multi-wavelength lasers (MWLs) developed by AEP of NRC in Canada. Their key technical specifications include L-I-V curves, optical and RF beating spectra, relative intensity noise (RIN), and optical phase noise of each individual wavelength channel, as well as timing jitter are investigated. Data bandwidth transmission capacity of 5.376 Tbit/s and 10.3 Tbit/s respectively in the PAM-4 and 16-QAM modulation formats are demonstrated by only using a single QD MWL chip. We have also developed a novel monolithic InAs/InP QD dual-wavelength (DW) DFB laser as a compact optical beat source to generate millimeter-wave (MMW) signals. Because of using a common cavity, highly coherent and correlated optical modes with optical linewidth as low as 15.83 kHz, spectrally pure MMW signals around 46.8 GHz with a linewidth down to 26.1 kHz were experimentally demonstrated. By using this QD DW-DFB laser, a 1Gbaud (2Gbps) MMW over-fiber transmission link is demonstrated with PAM-4 signals. The results show that the demonstrated device is suitable for high speed high capacity MMW fiber-wireless integrated fronthaul of 5G networks.
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Journal articles

Dissertations / Theses on the topic "Quantum coherent communications":

1

Aymeric, Raphaël. "Convergence of quantum and classical communications." Electronic Thesis or Diss., Institut polytechnique de Paris, 2022. https://theses.hal.science/tel-03919212.

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Les protocoles de distribution de clé quantique (QKD) permettent de construire des canaux de communications sensibles à l’espionnage grâce aux propriétés quantiques fondamentales de la lumière. L’un des principaux défis à surpasser pour déployer de tels protocoles à grande échelle est le coût de déploiement de la technologie. Une solution attrayante en ce sens serait d’exploiter l’infrastructure de fibre optique déjà existante pour exécuter mettre en oeuvre de tels protocoles. Cela implique cependant de faire coexister des signaux quantiques avec des signaux telecoms classiques, ce qui peut être un défi de part la sensibilité des états quantiques aux perturbations. Ici, nous nous intéressons plus particulièrement aux protocoles de distribution de clé quantique à variables continues (CV-QKD), car leur proximité avec les communications cohérentes classiques indiquent qu’ils sont de bons candidats pour coexister sur une même fibre. En partant du principe que les protocoles CV-QKD sont destinés, à terme, à être déployés de manière conjointe avec des protocoles de communication classique, la question qui se pose est la suivante. Cette coexistence avec des signaux classiques est-elle forcément un désavantage pour la CV-QKD ? Nous montrons qu’en construisant de façon conjointe des protocoles de communication quantique et classique, alors la coexistence peut présenter des avantages exploitables pour la CV-QKD. Dans un premier travail, nous démontrons expérimentalement que le signal classique peut servir de signal pilote au signal quantique, ce qui permet notamment de s’affranchir de signaux pilotes auxiliaires généralement nécessaires en CV-QKD. Dans un second travail, nous montrons que le bruit généré par des canaux classiques peut servir à dissimuler le signal quantique. La communication quantique peut alors être réalisée de façon indétectable, ou « covert », ce qui, combiné à un échange de clé par QKD permet d’envisager des garanties de sécurité extrêmement élevées. Nous analysons les conditions nécessaires, à la faisabilité du déploiement covert de la CV-QKD
Quantum key distribution (QKD) protocols harness fundamental quantum properties of the light to construct communication channels sensitive to eavesdropping. In order to develop the technology at large scale, one of the main challenges to overcome is the deployment cost of such systems. A significant step towards reducing deployment costs would be to use the existing optical fiber infrastructure to perform QKD, since this would relax the need to use dark (and expensive !) fiber. However this also means we must insure QKD protocols can coexist with classical communications, which can be challenging as quantum states are very sensitive to perturbations. Here, we focus particularly on continuous-variable (CV) QKD because their natural proximity to classical coherent communication systems indicates that they are good candidates for coexistence over the same fiber. Assuming CV-QKD is destined to be incorporated in classical communication links, an interesting question is whether the coexistence with classical channels will necessarily be detrimental to the CV-QKD protocol. We show that in some cases, coexistence can actually provide an advantage to the CV-QKD protocol. In a first project, we experimentally demonstrate that a classical channel can be used as a pilot signal for the quantum channel. Thus, the need for pilot-tones, mandatory in a typical CV-QKD protocol, can be relaxed. In a second project, we show that the noise generated by classical channels can be used to ”hide” the quantum signal. The quantum communication therefore can become covert thanks to the classical channels. Covert QKD protocols are interesting because they provide extreme security guarantees. We investigate the necessary conditions for covert CV-QKD as well as scenarios for its deployment in a practical setting
2

Pes, Salvatore. "Nanostructures-based 1.55 μm-emitting Vertical-(External)-Cavity Surface-Emitting Lasers for microwave photonics and coherent communications." Thesis, Rennes, INSA, 2019. https://tel.archives-ouvertes.fr/tel-02892844.

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Les travaux de thèse présentés en ce mémoire ont comme objectif principal le développement des sources lasers à semi- conducteurs en cavité verticale sur substrat InP, intègrent des régions actives à nanostructure quantiques, et émettent à des longueurs d’onde “télécom” (1550-1600 nm). Le développement d’un nouveau procédé technologique pour la réalisation de composants VCSEL compactes est détaillé. Ce procédé (nommé TSHEC) a été utilisé pour réaliser des émetteurs VCSELs en pompage optique sur plateforme hôte Si, ayant des performances très satisfaisantes. Ce même procédé a été adapté à la réalisation de VCSELs en pompage électrique, avec une étude préliminaire de la section de confinement électrique basée sur une BTJ en InGaAs, et le développement d’un nouveau jeu de masque dédié. Grace à la mise au point de la technologie des μ-cellules à cristaux liquides réalisé en partenariat avec LAAS, IMT Atlantique et C2N, on a pu adapter le procédé TSHEC pour la réalisation de dispositifs accordables. Une photodiode accordable autour de 1.55 μm a été réalisée, et des émetteurs VCSELs accordables basés sur la même technologie sont actuellement en cours de développement. Dans ces travaux on a également abordé le développement des VECSELs à base de bâtonnets quantiques InAs et émettent à 1.6 μm. Un premier dispositif a été réalisé et caractérisé en régime multimode et mono-fréquence. Finalement, la réalisation d’un banc expérimental pour la mesure directe de la constante de couplage dans des VECSELs bi-fréquence a été détaillée. Ce banc a permis de quantifier précisément le couplage existant entre deux états propres orthogonaux d’un VECSEL à puits quantiques émettent à 1.54 μm, et prochainement permettra la même étude dans des structures anisotropes, tels quels les bâtonnets quantiques ou le boites quantiques, dans le but d’investiguer l’effet de l’élargissement inhomogène présenté par ces milieux à gain en termes de couplage entre modes propres
The work presented in this dissertation focus on the development of InP-based semiconductor vertical-cavity lasers, based on quantum nanostructures and emitting at the telecom wavelengths (1550-1600 nm). A new technological process for the realization of compact VCSELs is described. This process (named TSHEC) has been employed to realize optically-pumped VCSELs, integrated onto a host Silicon platform, with good performances. The same process has been adapted to develop an electrically-driven version of VCSELs: a preliminary study of the confinement section based on a InGaAs-BTJ is presented, together with the development of a mask set. Thanks to the development of the liquid crystals μ-cell technology (in collaboration with LAAS, IMT Atlantique et C2N), we realized a tunable photodiode at 1.55 μm, and a tunable VCSEL is currently under development. This work also presents the first realization of a 1.6 μm- emitting optically-pumped quantum dashes-based VECSELs, and its characterization in multi-mode and single-frequency regime. Finally, the realization of an experimental setup for the investigation of the coupling between two orthogonal eigenstates of a bi- frequency 1.54 μm-emitting SQW-VECSEL has been conceived and realized. This setup, which allowed the direct quantification of the coupling constant on such a device, in the near future will allow performing the same study on anisotropic structures like quantum dashes or quantum dots, with the objective of studying the inhomogeneous broadening effect observed in these gain regions
3

Harrow, Aram (Aram Wettroth) 1980. "Applications of coherent classical communication and the Schur transform to quantum information theory." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/34973.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2005.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (p. 167-176).
Quantum mechanics has led not only to new physical theories, but also a new understanding of information and computation. Quantum information not only yields new methods for achieving classical tasks such as factoring and key distribution but also suggests a completely new set of quantum problems, such as sending quantum information over quantum channels or efficiently performing particular basis changes on a quantum computer. This thesis contributes two new, purely quantum, tools to quantum information theory-coherent classical communication in the first half and an efficient quantum circuit for the Schur transform in the second half. The first part of this thesis (Chapters 1-4) is in fact built around two loosely overlapping themes. One is quantum Shannon theory, a broad class of coding theorems that includes Shannon and Schumacher data compression, channel coding, entanglement distillation and many others. The second, more specic, theme is the concept of using unitary quantum interactions to communicate between two parties. We begin by presenting new formalism: a general framework for Shannon theory that describes communication tasks in terms of fundamental information processing resources, such as entanglement and classical communication. Then we discuss communication with unitary gates and introduce the concept of coherent classical communication, in which classical messages are sent via some nearly unitary process. We find that coherent classical communication can be used to derive several new quantum protocols and unify them both conceptually and operationally with old ones.
(cont.) Finally, we use these new protocols to prove optimal trade-o curves for a wide variety of coding problems in which a noisy channel or state is consumed and two noiseless resources are either consumed or generated at some rate. The second half of the thesis (Chapters 5-8) is based on the Schur transform, which maps between the computational basis of (Cd)n and a basis (known as the Schur basis) which simultaneously diagonalizes the commuting actions of the symmetric group Sn and the unitary group Ud. The Schur transform is used as a subroutine in many quantum communication protocols (which we review and further develop), but previously no polynomial-time quantum circuit for the Schur transform was known. We give such a polynomial-time quantum circuit based on the Clebsch-Gordan transform and then give algorithmic connections between the Schur transform and the quantum Fourier transform on Sn.
by Aram Wettroth Harrow.
Ph.D.
4

LI, XIAOXU. "WAVELENGTH-DIVISION-MULTIPLEXED TRANSMISSION USING SEMICONDUCTOR OPTICAL AMPLIFIERS AND ELECTRONIC IMPAIRMENT COMPENSATION." Doctoral diss., University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4025.

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Over the last decade, rapid growth of broadband services necessitated research aimed at increasing transmission capacity in fiber-optic communication systems. Wavelength division multiplexing (WDM) technology has been widely used in fiber-optic systems to fully utilize fiber transmission bandwidth. Among optical amplifiers for WDM transmission, semiconductor optical amplifier (SOA) is a promising candidate, thanks to its broad bandwidth, compact size, and low cost. In transmission systems using SOAs, due to their large noise figures, high signal launching powers are required to ensure reasonable optical signal-to-noise ratio of the received signals. Hence the SOAs are operated in the saturation region and the signals will suffer from SOA impairments including self-gain modulation, self-phase modulation, and inter channel crosstalk effects such as cross-gain modulation, cross-phase modulation, and four-wave mixing in WDM. One possibility to circumvent these nonlinear impairments is to use constant-intensity modulation format in the 1310 nm window where dispersion is also negligible. In this dissertation, differential phase-shift keying (DPSK) WDM transmission in the 1310 nm window using SOAs was first considered to increase the capacity of existing telecommunication network. A WDM transmission of 4 x 10 Gbit/s DPSK signals over 540 km standard single mode fiber (SSMF) using cascaded SOAs was demonstrated in a recirculating loop. In order to increase the transmission reach of such WDM systems, those SOA impairments must be compensated. To do so, an accurate model for quantum-dot (QD) SOA must be established. In this dissertation, the QD-SOA was modeled with the assumption of overall charge neutrality. Static gain was calculated. Optical modulation response and nonlinear phase noise were studied semi-analytically based on small-signal analysis. The quantitative studies show that an ultrafast gain recovery time of ~0.1 ps can be achieved when QD-SOAs are under high current injection, which leads to high saturation output power. However more nonlinear phase noise is induced when the QD-SOAs are used in the transmission systems operating at 10 Gbit/s or 40 Gbit/s. Electronic post-compensation for SOA impairments using coherent detection and digital signal processing (DSP) was investigated next in this dissertation. An on-off keying transmission over 100 km SSMF using three SOAs at 1.3 [micrometer] were demonstrated experimentally with direct detection and SOA impairment compensation. The data pattern effect of the signal was compensated effectively. Both optimum launching power and Q-factor were improved by 8 dB. For advanced modulation formats involving phase modulation or in transmission windows with large dispersion, coherent detection must be used and fiber impairments in WDM systems need to be compensated as well. The proposed fiber impairment compensation is based on digital backward propagation. The corresponding DSP implementation was described and the required calculations as well as system latency were derived. Finally joint SOA and fiber impairment compensations were experimentally demonstrated for an amplitude-phase-shift keying transmission.
Ph.D.
Optics and Photonics
Optics and Photonics
Optics PhD
5

Jarzyna, Marcin. "Phase coherence in quantum metrology and communication." Doctoral thesis, 2016. https://depotuw.ceon.pl/handle/item/1715.

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Zhong, Manjin. "Development of Persistent Quantum Memories." Phd thesis, 2017. http://hdl.handle.net/1885/133864.

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This thesis investigates the coherence properties of the hyperfine transitions of the 151Eu3+ ions in Eu3+:Y2SiO5 and evaluates the potential of developing quantum memories using these transitions. Quantum memories for light with long storage times are required for quantum commu- nication applications. For these memories to be useful they need to have storage times long compared to the transmission times across the communication network. For a global optical communication network this requires storage time longer than 100 ms. Rare-earth doped crystals have been identified as a suitable storage material. The storage time of these systems is limited by the coherence time of the hyperfine transitions of the optically active rare-earth ions. In previous work it had been demonstrated that coherence times as long as 1.4 seconds could be achieved for hyperfine transitions in Pr3+:Y2SiO5 by ap- plying a particular magnetic field such that the first order Zeeman shift of the transition nulled. This technique is known as zero first-order Zeeman (ZEFOZ). Due to the relatively large second order Zeeman efficient of the transitions in Pr3+:Y2SiO5, an extension of the coherence time, significantly beyond the 1.4 second mark using ZEFOZ, is not expected. However, it has been predicted that coherence times more than two orders of magnitude longer could be achieved in Eu3+:Y2SiO5 due to the smaller second order Zeeman shifts associated with the relevant hyperfine transitions. The dominant decoherence mechanism for the hyperfine transitions in diluted Eu3+:Y2SiO5 is the magnetic field perturbations caused by the random spin reconfigu- ration of the Y3+ ions in the host. By applying the ZEFOZ technique, previously used in Pr3+:Y2SiO5, the sensitivity of the transition’s frequency to environmental magnetic field perturbations was significantly reduced. Further, this strong ZEFOZ magnetic field was also shown to induce a frozen core around the Eu3+ ion, which resulted in a signifi- cant suppression of the reconfiguration of the nearby Y3+ spins. The combined effect of the reduced sensitivity and frozen core effect allowed a decoherence rate of 8 × 10−5 s−1 over 100 milliseconds to be demonstrated. The observed decoherence rate is at least an order of magnitude lower than that of any other system suitable for an optical quantum memory. Furthermore, by employing dynamic decoherence control, a coherence time of 370 ± 60 minutes was achieved. This 6 hour coherence time observed here opens up the possibility of distributing quantum entanglement via the physical transport of memories as an alternative to optical communications. It was found that even at the critical point alignment the observed coherence times showed that the Y3+ spin flips remain the dominant decoherence mechanism. To aid in the development of future strategies to further extend the coherence time beyond 6 hours, a study of the Y3+ spin dynamics in the frozen core was conducted. Four of the Y3+ sites were resolved and a complete mapping of all frozen-core Y3+ sites was limited by the inhomogeneity of the applied magnetic field. The Rabi frequency, the coherence time and lifetime as well as the interaction strength with the Eu3+ ion of one of these Y3+ ions were measured. The observed lifetime of the Y3+ ion is 27 s, which is four orders of magnitude longer than the low field value. With the technique developed, a detailed understanding of the frozen-core dynamics is possible, which would allow an extension of the hyperfine coherence time of the Eu3+ ion towards the lifetime limit. In summary, this thesis provides a detailed characterisation of the decoherence mecha- nisms of the hyperfine transitions in Eu3+:Y2SiO5. The potential of using rare-earth doped crystals for the long-term storage of quantum information with applications to long-range quantum communications is identified. The demonstrated long coherence time of the quantum transitions for information storage allows a new way of entanglement distribu- tion: entanglement is transported by physically transporting the memory crystal rather than the light. This approach opens a new regime for both quantum communication and fundamental tests of quantum mechanics.
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Rufeil, Fiori Elena. "Dinámica coherente de excitaciones de carga y espín en sistemas unidimensionales /." Doctoral thesis, 2009. http://hdl.handle.net/11086/133.

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Tesis (Doctor en Física)--Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física, 2009.
El control y diseño de la dinámica cuántica constituye el núcleo del procesamiento de información cuántica. Sin embargo, en sistemas de espines acoplados la alta conectividad de las interacciones y la complejidad de los estados accesibles a temperatura ambiente dificultan la obtención del grado de control necesario. En esta tesis mostramos alternativas para obtener una dinámica coherente controlada que puede obtenerse en sistemas de espines interactuantes en experimentos de NMR. La clave para obtener el grado de simplicidad deseado es el adecuado diseño de las interacciones efectivas y la elección de la topología de los acoplamientos.

Books on the topic "Quantum coherent communications":

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Greve, Kristiaan De. Towards Solid-State Quantum Repeaters: Ultrafast, Coherent Optical Control and Spin-Photon Entanglement in Charged InAs Quantum Dots. Springer, 2016.

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Greve, Kristiaan De. Towards Solid-State Quantum Repeaters: Ultrafast, Coherent Optical Control and Spin-Photon Entanglement in Charged Inas Quantum Dots. Springer London, Limited, 2013.

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Kurizki, Gershon, and Goren Gordon. The Quantum Matrix. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198787464.001.0001.

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“Meet Henry Bar, a physicist and … quantum superhero.” The title The Quantum Matrix refers to a central concept in quantum physics, but also (allegorically) to our enigmatic world. In this book, Henry Bar, physicist and the first quantum superhero, guides the reader through the amazing quantum world. Henry’s hair-raising adventures in his perilous struggle for quantum coherence are graphically depicted by comics and thoroughly explained to the lay reader. Behind each adventure lies a key concept in quantum physics. These concepts range from the basic quantum coherence and entanglement through tunneling and the recently discovered quantum decoherence control, to the principles of the emerging technologies of quantum communication and computing. The explanations of the concepts are popular, but nonetheless rigorous and detailed, and are followed by their broader context, their historic perspective, up-to-date status and forthcoming developments. Finally, thought-provoking philosophical and cultural implications of these concepts are discussed. The mathematical appendices of all chapters cover, in a straightforward manner, the core aspects of quantum physics at the level of a university introductory course. The Quantum Matrix presents an entertaining, popular yet comprehensive picture of quantum physics. It can be read as a light-hearted illustrated tale, a philosophical treatise or a textbook. Either way, the book lets the reader delve deeply into the wondrous quantum world from diverse perspectives and obtain glimpses into the quantum technologies that are about to reshape our lives. May the reader’s voyage through the quantum world charted by this book be both pleasant and rewarding.
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Perillán, José G. Science Between Myth and History. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198864967.001.0001.

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Scientists regularly employ historical narrative as a rhetorical tool in their communication of science, yet there’s been little reflection on its effects within scientific communities and beyond. Science Between Myth and History begins to unravel these threads of influence. The stories scientists tell are not just poorly researched scholarly histories, they are myth-histories, a chimeric genre that bridges distinct narrative modes. This study goes beyond polarizing questions about who owns the history of science and establishes a common ground from which to better understand the messy and lasting legacy of the stories scientists tell. It aims to stimulate vigorous conversation among science practitioners, scholars, and communicators. Scientific myth-histories undoubtedly deliver value, coherence, and inspiration to their communities. They are tools used to broker scientific consensus, resolve controversies, and navigate power dynamics. Yet beyond the explicit intent and rationale behind their use, these narratives tend to have great rhetorical power and social agency that bear unintended consequences. This book unpacks the concept of myth-history and explores four case studies in which scientist storytellers use their narratives to teach, build consensus, and inform the broader public. From geo-politically informed quantum interpretation debates to high-stakes gene-editing patent disputes, these case studies illustrate the implications of storytelling in science. Science Between Myth and History calls on scientists not to eschew writing about their history, but to take more account of the stories they tell and the image of science they project. In this time of eroding common ground, when many find themselves dependent on, yet distrustful of scientific research, this book interrogates the effects of mismatched, dissonant portraits of science.

Book chapters on the topic "Quantum coherent communications":

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Westmoreland, Michael, and Benjamin Schumacher. "Capacities of Quantum Channels and Quantum Coherent Information." In Quantum Computing and Quantum Communications, 285–95. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/3-540-49208-9_25.

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Aschauer, Hans, and Hans J. Briegel. "Quantum Communication and Decoherence." In Coherent Evolution in Noisy Environments, 235–61. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/3-540-45855-7_6.

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Leonhardt, Ulf, and Igor Jex. "Quantum-State Tomography and Quantum Communication." In Coherence and Quantum Optics VII, 675–76. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4757-9742-8_208.

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Kumar, P. "Fiber generated quantum correlations for quantum-optical communications." In Coherence and Quantum Optics VIII, 185. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/978-1-4419-8907-9_21.

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Fiorentino, M., J. E. Sharping, A. Coker, and P. Kumar. "Fiber generated quantum correlations for quantum-optical communications." In Coherence and Quantum Optics VIII, 351–52. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/978-1-4419-8907-9_64.

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Burkard, Guido, Hans-Andreas Engel, and Daniel Loss. "Spintronics and Quantum Dots for Quantum Computing and Quantum Communication." In Complexity from Microscopic to Macroscopic Scales: Coherence and Large Deviations, 83–104. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-010-0419-0_4.

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Tosi, M. P. "Coherence and Superfluidity in Atomic Gases." In Quantum Communication and Information Technologies, 299–328. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-010-0171-7_13.

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Li, Ming, and Li Li. "Coherent State Based Quantum Optical Communication with Mature Classical Infrastructure." In Lecture Notes in Electrical Engineering, 2647–53. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-13-9409-6_323.

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Vourdas, A. "Resolutions of the Identity in Terms of Line Integrals of Coherent States and Their Use for Quantum State Engineering." In Quantum Communication, Computing, and Measurement, 265–68. Boston, MA: Springer US, 1997. http://dx.doi.org/10.1007/978-1-4615-5923-8_28.

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Ma, Xudong, and Yongming Li. "Coherence of Quantum States Based on Mutually Unbiased Bases in $$\mathbb {C}^4$$." In Communications in Computer and Information Science, 43–60. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-8152-4_3.

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Conference papers on the topic "Quantum coherent communications":

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Nieto-Chaupis, Huber. "Molecular Communications as Quantum Mechanics Coherent States." In 2023 International Conference on Electrical, Computer and Energy Technologies (ICECET). IEEE, 2023. http://dx.doi.org/10.1109/icecet58911.2023.10389333.

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Nieto-Chaupis, Huber. "Coherent Molecular Communications By Using Quantum Mechanics." In 2023 IEEE/ACIS 8th International Conference on Big Data, Cloud Computing, and Data Science (BCD). IEEE, 2023. http://dx.doi.org/10.1109/bcd57833.2023.10466283.

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Liu, Shilong, shuai shi, yinhai li, Shikai Liu, Zhiyuan Zhou, and Bao-Sen Shi. "Coherent frequency bridge between visible and telecommunications band for vortex light." In Quantum Communications and Quantum Imaging XVI, edited by Ronald E. Meyers, Yanhua Shih, and Keith S. Deacon. SPIE, 2018. http://dx.doi.org/10.1117/12.2320020.

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Kazovsky, Leonid G., and Georgios Kalogerakis. "Modern coherent optical communications." In 2006 Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference. IEEE, 2006. http://dx.doi.org/10.1109/cleo.2006.4627709.

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Schaeffer, Christian G., and Sebastian Kleis. "Design of Coherent Receivers for Quantum Communication." In Asia Communications and Photonics Conference. Washington, D.C.: OSA, 2016. http://dx.doi.org/10.1364/acpc.2016.ath3d.3.

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Azuma, Koji. "Optimal single-error-type entanglement generation via coherent-state transmission (Conference Presentation)." In Quantum Communications and Quantum Imaging XX, edited by Keith S. Deacon and Ronald E. Meyers. SPIE, 2022. http://dx.doi.org/10.1117/12.2633279.

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Virzì, Salvatore, Cecilia Clivati, Alice Meda, Simone Donadello, Marco Genovese, Filippo Levi, Alberto Mura, Ivo Degiovanni, and Davide Calonico. "Coherent phase transfer for real-world twin-field quantum key distribution (Conference Presentation)." In Quantum Communications and Quantum Imaging XX, edited by Keith S. Deacon and Ronald E. Meyers. SPIE, 2022. http://dx.doi.org/10.1117/12.2646325.

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Luo, Qingbin, Guowu Yang, Kun She, Xiaoyu Li, and Yuqi Wang. "Quantum homomorphic signature using coherent states." In 2016 2nd IEEE International Conference on Computer and Communications (ICCC). IEEE, 2016. http://dx.doi.org/10.1109/compcomm.2016.7924865.

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Djordjevic, Ivan B. "Entanglement Assisted Bistatic Radars Outperforming Coherent States-based Quantum Radars." In Signal Processing in Photonic Communications. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/sppcom.2022.spw2j.4.

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We propose an entanglement assisted bistatic radar employing the optical phase conjugation on transmitter side and classical coherent detection on receiver side, which significantly outperforms corresponding classical and coherent states-based quantum radars.
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Mendieta, F. J., A. Arvizu, R. Muraoka, P. Gallion, and J. Sanchez. "Coherent photodetection with applications in quantum communications and cryptography." In Seventh Symposium on Optics in Industry, edited by Guillermo García Torales, Jorge L. Flores Núñez, Gilberto Gómez Rosas, and Eric Rosas. SPIE, 2009. http://dx.doi.org/10.1117/12.848861.

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Reports on the topic "Quantum coherent communications":

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Perdigão, Rui A. P. New Horizons of Predictability in Complex Dynamical Systems: From Fundamental Physics to Climate and Society. Meteoceanics, October 2021. http://dx.doi.org/10.46337/211021.

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Discerning the dynamics of complex systems in a mathematically rigorous and physically consistent manner is as fascinating as intimidating of a challenge, stirring deeply and intrinsically with the most fundamental Physics, while at the same time percolating through the deepest meanders of quotidian life. The socio-natural coevolution in climate dynamics is an example of that, exhibiting a striking articulation between governing principles and free will, in a stochastic-dynamic resonance that goes way beyond a reductionist dichotomy between cosmos and chaos. Subjacent to the conceptual and operational interdisciplinarity of that challenge, lies the simple formal elegance of a lingua franca for communication with Nature. This emerges from the innermost mathematical core of the Physics of Coevolutionary Complex Systems, articulating the wealth of insights and flavours from frontier natural, social and technical sciences in a coherent, integrated manner. Communicating thus with Nature, we equip ourselves with formal tools to better appreciate and discern complexity, by deciphering a synergistic codex underlying its emergence and dynamics. Thereby opening new pathways to see the “invisible” and predict the “unpredictable” – including relative to emergent non-recurrent phenomena such as irreversible transformations and extreme geophysical events in a changing climate. Frontier advances will be shared pertaining a dynamic that translates not only the formal, aesthetical and functional beauty of the Physics of Coevolutionary Complex Systems, but also enables and capacitates the analysis, modelling and decision support in crucial matters for the environment and society. By taking our emerging Physics in an optic of operational empowerment, some of our pioneering advances will be addressed such as the intelligence system Earth System Dynamic Intelligence and the Meteoceanics QITES Constellation, at the interface between frontier non-linear dynamics and emerging quantum technologies, to take the pulse of our planet, including in the detection and early warning of extreme geophysical events from Space.

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