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Artículos de revistas sobre el tema "Dephasing"

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Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 10 de marzo de 2023

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1

Moreira, Saulo V., Breno Marques y Fernando L. Semião. "Time-Dependent Dephasing and Quantum Transport". Entropy 23, n.º 9 (8 de septiembre de 2021): 1179. http://dx.doi.org/10.3390/e23091179.

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The investigation of the phenomenon of dephasing assisted quantum transport, which happens when the presence of dephasing benefits the efficiency of this process, has been mainly focused on Markovian scenarios associated with constant and positive dephasing rates in their respective Lindblad master equations. What happens if we consider a more general framework, where time-dependent dephasing rates are allowed, thereby, permitting the possibility of non-Markovian scenarios? Does dephasing-assisted transport still manifest for non-Markovian dephasing? Here, we address these open questions in a setup of coupled two-level systems. Our results show that the manifestation of non-Markovian dephasing-assisted transport depends on the way in which the incoherent energy sources are locally coupled to the chain. This is illustrated with two different configurations, namely non-symmetric and symmetric. Specifically, we verify that non-Markovian dephasing-assisted transport manifested only in the non-symmetric configuration. This allows us to draw a parallel with the conditions in which time-independent Markovian dephasing-assisted transport manifests. Finally, we find similar results by considering a controllable and experimentally implementable system, which highlights the significance of our findings for quantum technologies.

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2

Abdel-Hameed, Hamada, Nour Zidan y Nasser Metwally. "Quantum Fisher information of two superconducting charge qubits under dephasing noisy channel". International Journal of Modern Physics B 32, n.º 22 (20 de agosto de 2018): 1850245. http://dx.doi.org/10.1142/s0217979218502454.

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The Quantum Fisher information (QFI) of a two charged qubits system that interacts locally with a dephasing channel is quantified with respect to the charged qubits’ and the channel’s parameters. The behavior of Fisher information displays different phenomena as; the sudden changes (increasing/decreasing); the gradual decay and freezing of the QFI. It is shown that the QFI of the dephasing parameter decays gradually and vanishes completely as one increases the initial energies of the qubits and their mutual energy. The possibility of estimating the charged qubits’ energies may be maximized at smaller values of the initial dephasing’s parameter. The estimation degree of the mutual information reaches its upper bounds by increasing the initial energies. It is depicted that, by controlling the qubits’ and the channel’s parameters, the QFI may be frozen. We expect that this result may be interesting in the context of quantum encoding and quantum cryptography.

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3

JACAK, W., J. KRASNYJ, L. JACAK y W. DONDEROWICZ. "DEPHASING OF QD EXCITON ORBITAL AND SPIN STATES DUE TO HYBRIDIZATION WITH BULK COLLECTIVE EXCITATIONS". International Journal of Modern Physics B 25, n.º 10 (20 de abril de 2011): 1359–75. http://dx.doi.org/10.1142/s0217979211100187.

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We analyze theoretically a hybridization type dressing of orbital (i.e., charge) and spin degrees of freedom of excitations captured in semiconductor quantum dot with band phonons and magnons (the latter for magnetic semiconductor surroundings), as a mechanism of dephasing of rapidly excited dot exciton state. Within the Green function approach we derive our previously formulated heuristic general rule for estimation of corresponding dephasing time-rate. The pure dephasing (off-diagonal decoherence) of quantum dot exciton resulting due to this dressing is studied, for both orbital and spin states of the exciton. A significant difference between phonon-induced (for charge) and magnon-assisted (for spin) quantum dot exciton dephasing is indicated as the result of the spin conservation, which leads to the disappearance of the exciton spin pure-dephasing at T = 0 (freezing out of spin dephasing), in contrary to the exciton charge dephasing caused by phonons, which maintains strong even at T = 0.

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4

Neupane, Tikaram, Quinton Rice, Sungsoo Jung, Bagher Tabibi y Felix Jaetae Seo. "Exciton Dephasing in Tungsten Diselenide Atomic Layer". Journal of Nanoscience and Nanotechnology 20, n.º 7 (1 de julio de 2020): 4502–4. http://dx.doi.org/10.1166/jnn.2020.17593.

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An intrinsic exciton dephasing is the coherence loss of exciton dipole oscillation, while the total exciton dephasing originates from coherence loss due to exciton–exciton interaction and excitonphonon coupling. In this article, the total exciton dephasing time of tungsten diselenide (WSe2) atomic layers was analyzed as functions of excitation intensity with exciton–exciton coupling strength and temperature with exciton–phonon coupling strength. It was hypothesized that the total exciton dephasing time is shortened as the exciton–exciton interaction and the exciton–phonon coupling are increased. The coherence loss analysis revealed that the exciton dephasing time of WSe2 atomic layers is due to mainly the temperature rather than the excitation intensity.

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5

Rector, K. D. y M. D. Fayer. "Myoglobin Dynamics Measured With Vibrational Echo Experiments". Laser Chemistry 19, n.º 1-4 (1 de enero de 1999): 19–34. http://dx.doi.org/10.1155/1999/83895.

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Ps infrared vibrational echo experiments on myoglobin and myoglobin mutants are presented. The vibrational dephasing experiments examine the influence of protein dynamics on the CO ligand, at the active site of myoglobin, from low temperature to physiologically relevant temperatures. The vibrational echo results are combined with measurements of the CO vibrational lifetime to yield the homogeneous pure dephasing. The pure dephasing is the Fourier transform of the homogeneous linewidth with the lifetime contribution removed. The mutant H64V protein's CO vibrational pure dephasing rate is ∼20% slower (narrower pure dephasing linewidth) than the native protein at all temperatures, although the only difference between the two proteins is the replacement of the native’s polar distal histidine by a non-polar valine. The mutant H93G(N-MeIm) pure dephasing is identical to the native's, despite the severing of the only covalent bond between the heme and the globin. These results provide insights into the mechanisms of the transmission of protein fluctuations to the CO ligand bound at the active site.

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6

XIONG, YONG-JIAN y SHI-JIE XIONG. "BROADENING OF FANO RESONANCE IN ELECTRONIC CURRENT THROUGH A QUANTUM DOT BY DEPHASING". International Journal of Modern Physics B 16, n.º 10 (20 de abril de 2002): 1479–87. http://dx.doi.org/10.1142/s0217979202011032.

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We investigate the Fano line shape in electron transport through a quantum dot in presence of dephasing. The dephasing effect is introduced by the Büttiker model. We derive a generalized Fano formula for the conductance that includes the components of the standard Fano line shape and the Breit–Wigner line shape. According to this formula the Fano parameter |q| decreases when the dephasing strength increases by increasing the temperature. The increase of the half width of the resonance peak by increasing the temperature measured by Zacharia et al. [Phys. Rev.B64, 155311 (2001)] which is more rapid than expected from the ordinary theories is possibly attributed to the dephasing.

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7

Ji, Chen-Guang, Yong-Chun Liu y Guang-Ri Jin. "Spin squeezing of one-axis twisting model in the presence of phase dephasing". Quantum Information and Computation 13, n.º 3&4 (marzo de 2013): 266–80. http://dx.doi.org/10.26421/qic13.3-4-7.

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We present a detailed analysis of spin squeezing of the one-axis twisting model with a many-body phase dephasing, which is induced by external field fluctuation in a two-mode Bose-Einstein condensates. Even in the presence of the dephasing, our analytical results show that the optimal initial state corresponds to a coherent spin state $|\theta_{0}, \phi_0\rangle$ with the polar angle $\theta_0=\pi/2$. If the dephasing rate $\gamma\ll S^{-1/3}$, where $S$ is total atomic spin, we find that the smallest value of squeezing parameter (i.e., the strongest squeezing) obeys the same scaling with the ideal one-axis twisting case, namely $\xi^2\propto S^{-2/3}$. While for a moderate dephasing, the achievable squeezing obeys the power rule $S^{-2/5}$, which is slightly worse than the ideal case. When the dephasing rate $\gamma>S^{1/2}$, we show that the squeezing is weak and neglectable.

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8

ASHITANI, YUKI, KEN-ICHIRO IMURA y YOSITAKE TAKANE. "PERFECTLY CONDUCTING CHANNEL AND ITS ROBUSTNESS IN DISORDERED CARBON NANOSTRUCTURES". International Journal of Modern Physics: Conference Series 11 (enero de 2012): 157–62. http://dx.doi.org/10.1142/s201019451200606x.

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We report our recent numerical study on the effects of dephasing on a perfectly conducting channel (PCC), its presence believed to be dominant in the transport characteristics of a zigzag graphene nanoribbons (GNR) and of a metallic carbon nanotubes (CNT). Our data confirms an earlier prediction that a PCC in GNR exhibits a peculiar robustness against dephasing, in contrast to that of the CNT. By studying the behavior of the conductance as a function of the system's length we show that dephasing destroys the PCC in CNT, whereas it stabilizes the PCC in GNR. Such opposing responses of the PCC against dephasing stem from a different nature of the PCC in these systems.

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9

Leviant, Peter, Qian Xu, Liang Jiang y Serge Rosenblum. "Quantum capacity and codes for the bosonic loss-dephasing channel". Quantum 6 (29 de septiembre de 2022): 821. http://dx.doi.org/10.22331/q-2022-09-29-821.

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Bosonic qubits encoded in continuous-variable systems provide a promising alternative to two-level qubits for quantum computation and communication. So far, photon loss has been the dominant source of errors in bosonic qubits, but the significant reduction of photon loss in recent bosonic qubit experiments suggests that dephasing errors should also be considered. However, a detailed understanding of the combined photon loss and dephasing channel is lacking. Here, we show that, unlike its constituent parts, the combined loss-dephasing channel is non-degradable, pointing towards a richer structure of this channel. We provide bounds for the capacity of the loss-dephasing channel and use numerical optimization to find optimal single-mode codes for a wide range of error rates.

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10

Lingnau, Benjamin, Jonas Turnwald y Kathy Lüdge. "Class-C semiconductor lasers with time-delayed optical feedback". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 377, n.º 2153 (22 de julio de 2019): 20180124. http://dx.doi.org/10.1098/rsta.2018.0124.

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We perform a linear stability analysis and numerical bifurcation diagrams of a class-C laser with time-delayed optical feedback. We employ a rate equation system based on the Maxwell–Bloch equations, and study the influence of the dephasing time on the laser dynamics. We find a stabilizing effect of an intermediate dephasing time, i.e. when moving from a class-B to a class-C laser. At long dephasing times, a destabilization of the laser solution occurs by a feedback-induced unlocking of Rabi oscillations at the second laser threshold. We predict an optimum resistance to time-delayed optical feedback for dephasing times close to the photon cavity lifetime. This article is part of the theme issue ‘Nonlinear dynamics of delay systems’.

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11

Roszak, K., P. Machnikowski y L. Jacak. "Decay of Entanglement Due to Pure Dephasing: the Role of Geometry of Entangled States". Open Systems & Information Dynamics 14, n.º 01 (marzo de 2007): 63–68. http://dx.doi.org/10.1007/s11080-007-9029-3.

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The study of the effect that pure dephasing has on the entanglement of a pair of two-level systems shows that complete disentanglement may be caused by partial pure dephasing for some initial entangled states. We examine the behaviour of the entanglement of two confined charge states under the influence of partial pure dephasing introduced by a super-Ohmic reservoir (typical for semiconductors). We classify the set of completely dephasible states and provide an explanation of this effect.

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12

Mi, Yi Lin y Xiao Yun Tie. "Spin Dephasing in Organic Semiconductor Spintronic Devices". Advanced Materials Research 113-116 (junio de 2010): 1904–7. http://dx.doi.org/10.4028/www.scientific.net/amr.113-116.1904.

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Spin dephasing in organic semiconductor was studied based on spin drift-diffusion model in various electric field. It is found that in the ohmic regime, spin dephasing is determined by the voltage bias. With increase of the voltage bias, spin coherence increases. And the increasing voltage bias can enhance the magnitude of the spin dephasing oscillations at a static perpendicular maganetic field. It shows that the current density in total device output can be modulated by an electrostatic field via controlled precession.

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13

Zheng, Hairong, Xiangyu Zhang, Dangli Gao y Richard S. Meltzer. "Optical Dephasing of Triply Ionized Rare Earths in Transparent Glass Ceramics Containing LaF3 Nanocrystals". Journal of Nanoscience and Nanotechnology 8, n.º 3 (1 de marzo de 2008): 1214–17. http://dx.doi.org/10.1166/jnn.2008.18174.

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Optical dephasing of Pr3+ and Tm3+ ions doped in transparent oxyfluoride glass ceramics was studied with the two-pulse photon echo technique. It was found that the dephasing time of rare earth ions is dramatically less in nanocrystals embedded in a glass matrix than in bulk crystals. Aquasi-linear temperature dependence obtained at low temperatures proved that the long-range interaction of the ions inside the nanocrystals with the two level systems of the glass matrix dominates the optical dephasing. The local thermal effect in glass ceramics containing nanocrystals elevates the local temperature, which results in the reduction of optical dephasing time. For Tm3+-doped glass ceramics, the elevation of local temperature induced by the irradiation of excitation laser even quenched the photon echo signals in the experimental study.

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14

Guo, Feng, Xiaotong Lu, Chihua Zhou y Hong Chang. "Experimental Observation of the Suppression of the Dephasing in a Floquet Engineering Optical Lattice Clock". Applied Sciences 12, n.º 22 (16 de noviembre de 2022): 11618. http://dx.doi.org/10.3390/app122211618.

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Accurately manipulating quantum states is a fundamental strategy for improving the performance of quantum metrology, computing, and simulation. However, the quantum state is susceptible to dephasing due to the temperature and density of the atomic ensembles. In this paper, we experimentally study the effect of Floquet engineering (FE) on the dephasing process in an 87Sr optical clock. By measuring the Rabi flopping process under different temperatures of the cold ensemble and numbers of atoms trapped in the lattice, our results show that the FE can suppress the dephasing due to high temperatures or a large number of atoms. Indeed, when the temperature and the number of atoms are 3.8 μK and 6300, respectively, the FE can obviously suppress the dephasing effect and improve the maximum excitation fraction of the Rabi spectrum by 15.4%.

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15

Lim, Youngmin, Shuang Wu, David A. Smith, Christoph Klewe, Padraic Shafer y Satoru Emori. "Absorption of transverse spin current in ferromagnetic NiCu: Dominance of bulk dephasing over spin-flip scattering". Applied Physics Letters 121, n.º 22 (28 de noviembre de 2022): 222403. http://dx.doi.org/10.1063/5.0120865.

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In ferromagnetic metals, transverse spin currents are thought to be absorbed via dephasing—i.e., destructive interference of spins precessing about the strong exchange field. Yet, due to the ultrashort coherence length of ≈1 nm in typical ferromagnetic thin films, it is difficult to distinguish dephasing in the bulk from spin-flip scattering at the interface. Here, to assess which mechanism dominates, we examine transverse spin-current absorption in ferromagnetic NiCu alloy films with reduced exchange fields. We observe that the coherence length increases with decreasing Curie temperature, as weaker dephasing in the film bulk slows down spin absorption. Moreover, nonmagnetic Cu impurities do not diminish the efficiency of spin-transfer torque from the absorbed spin current. Our findings affirm that the transverse spin current is predominantly absorbed by dephasing inside the nanometer-thick ferromagnetic metals, even with high impurity contents.

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16

Du, Chunguang y Zhizhan Xu. "Electron Acceleration by a Laser Pulse with a Rising Propagation Speed". Australian Journal of Physics 52, n.º 1 (1999): 49. http://dx.doi.org/10.1071/p98086.

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The acceleration of an electron by a circularly polarised laser pulse propagating at a time-rising speed in a plasma is studied. The limitation on the electron energy gain due to dephasing may disappear. The characteristics of this non-dephasing direct acceleration scheme are analysed.

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17

Łobejko, Marcin, Marcin Mierzejewski y Jerzy Dajka. "Interference of qubits in pure dephasing and almost pure dephasing environments". Journal of Physics A: Mathematical and Theoretical 48, n.º 27 (16 de junio de 2015): 275302. http://dx.doi.org/10.1088/1751-8113/48/27/275302.

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18

Peng, Qifang, Zhaoyang Peng, Yue Lang, Yalei Zhu, Dongwen Zhang, Zhihui Lü y Zengxiu Zhao. "Decoherence Effects of Terahertz Generation in Solids under Two-Color Femtosecond Laser Fields". Chinese Physics Letters 39, n.º 5 (1 de mayo de 2022): 053301. http://dx.doi.org/10.1088/0256-307x/39/5/053301.

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We theoretically investigate terahertz emission from solid materials pumped by intense two-color femtosecond laser field in the presence of decoherence effects. Quantum-mechanical simulations are based on the length gauge semiconductor Bloch equations describing the optical excitation and decoherence with phenomenological dephasing and depopulation times. Contributions of interband and intraband mechanisms are identified in time domain, and the latter has dominated THz generation in solid-state systems. It is found that dephasing is crucial for enhancing asymmetric intraband current and deduced that solid-state materials with short dephasing time and long depopulation time would be optimal selection for strong-field terahertz generation experiments.

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19

Han, Seung Kee, Christian Kurrer y Yoshiki Kuramoto. "Diffusive Interaction Leading to Dephasing of Coupled Neural Oscillators". International Journal of Bifurcation and Chaos 07, n.º 04 (abril de 1997): 869–76. http://dx.doi.org/10.1142/s0218127497000662.

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It is usually believed that strong diffusive coupling in one of the dynamical variables is well-suited for imposing synchronization of oscillators. But it was recently shown that weak diffusive coupling, counter-intuitively, can lead to dephasing of coupled neural oscillators. In this paper, we investigate how diffusively coupled oscillators become dephasing. For this we study a system of coupled neural oscillators on a limit cycle generated through a homoclinic bifurcation. We examine the asymptotic behavior of diffusive coupling as the control parameter approaches the critical value for which the homoclinic bifurcation occurs. In this study, we show that the gradient of phase velocity near the limit cycle is essential in generating dephasing through diffusive interaction.

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20

KUN, S. YU, A. V. VAGOV, L. T. CHADDERTON y W. GREINER. "A NEW PROBE FOR COHERENT MANY-BODY DYNAMICS: NONERGODIC MOLECULES IN CONTINUUM". International Journal of Modern Physics E 11, n.º 04 (agosto de 2002): 273–80. http://dx.doi.org/10.1142/s0218301302000909.

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We present a simple physical explanation that measurements of the collision cross-sections with pure energy resolution can provide information on the reaction dynamics equivalent to that obtained using real-time methods of femtochemistry. For nuclear collisions, the method provides a time resolution of ~ 10-21 sec. The method is sensitive enough to distinguish between the different scenarios of rotational dephasing for the highly-excited nuclear molecules, with strongly overlapping resonances, formed in 12C + 24Mg scattering. We find that the dephasing is much slower than the intra-molecular energy redistribution. This reveals unusual states — nonergodic molecules in continuum. Anomalously long dephasing times observed in highly-excited polyatomic molecules may reflect this new type of nonergodicity.

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21

Fatti, N. Del, F. Ganikhanov, P. Langot, R. Tommasi y F. Vallée. "Optical Phonon Coherence and Population Decays in III–V Semiconductors". Journal of Nonlinear Optical Physics & Materials 07, n.º 02 (junio de 1998): 271–89. http://dx.doi.org/10.1142/s0218863598000223.

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Investigations of optical phonon coherence and population decays in bulk III–V semiconductors are discussed. The results are compared to our lifetime determinations using a non phonon-mode selective technique based on precise measurement of electron-lattice thermalization dynamics. The measured LO phonon lifetimes were found to be consistent with the dephasing times measured in intrinsic samples. In the presence of carriers (for the density range 1016–1017 cm -3), due to LO phonon-plasmon hybridization, the dephasing time is strongly reduced and becomes much smaller than the lifetime which is almost not altered. The roles of pure dephasing and population decay mechanisms in optical phonon relaxation are discussed for various carrier environment.

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22

Iubini, Stefano, Simone Borlenghi, Anna Delin, Stefano Lepri y Francesco Piazza. "Dephasing-Assisted Macrospin Transport". Entropy 22, n.º 2 (13 de febrero de 2020): 210. http://dx.doi.org/10.3390/e22020210.

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Transport phenomena are ubiquitous in physics, and it is generally understood that the environmental disorder and noise deteriorates the transfer of excitations. There are, however, cases in which transport can be enhanced by fluctuations. In the present work, we show, by means of micromagnetics simulations, that transport efficiency in a chain of classical macrospins can be greatly increased by an optimal level of dephasing noise. We also demonstrate the same effect in a simplified model, the dissipative Discrete Nonlinear Schrödinger equation, subject to phase noise. Our results point towards the realization of a large class of magnonics and spintronics devices, where disorder and noise can be used to enhance spin-dependent transport efficiency.

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23

Moriarty, N. J. y S. A. Greenhalgh. "Dephasing of Seismic Sections". Exploration Geophysics 18, n.º 1-2 (1 de marzo de 1987): 144–48. http://dx.doi.org/10.1071/eg987144.

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24

Cohen, Doron y Yoseph Imry. "Dephasing at low temperatures". Physical Review B 59, n.º 17 (1 de mayo de 1999): 11143–46. http://dx.doi.org/10.1103/physrevb.59.11143.

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25

Ivlev, B. "Dephasing in an atom". Physica B: Condensed Matter 406, n.º 23 (diciembre de 2011): 4466–75. http://dx.doi.org/10.1016/j.physb.2011.09.010.

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26

Rauch, H., M. Suda y S. Pascazio. "Decoherence, dephasing and depolarization". Physica B: Condensed Matter 267-268 (junio de 1999): 277–84. http://dx.doi.org/10.1016/s0921-4526(99)00082-4.

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27

Nakazato, Hiromichi, Mikio Namiki, Saverio Pascazio y Yoshiya Yamanaka. "Quantum dephasing by chaos". Physics Letters A 222, n.º 3 (octubre de 1996): 130–36. http://dx.doi.org/10.1016/0375-9601(96)00647-0.

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28

Huber, D. L. "Optical Dephasing in Glasses". Materials Science Forum 51 (enero de 1991): 77–92. http://dx.doi.org/10.4028/www.scientific.net/msf.51.77.

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29

Rauch, H. y M. Suda. "Dephasing in neutron interferometry". Applied Physics B Laser and Optics 60, n.º 2-3 (1995): 181–86. http://dx.doi.org/10.1007/bf01135860.

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30

Grava, S., Y. He, S. Wu y D. E. Chang. "Renormalization group analysis of near-field induced dephasing of optical spin waves in an atomic medium". New Journal of Physics 24, n.º 1 (1 de enero de 2022): 013031. http://dx.doi.org/10.1088/1367-2630/ac465d.

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Abstract While typical theories of atom–light interactions treat the atomic medium as being smooth, it is well-known that microscopic optical effects driven by atomic granularity, dipole–dipole interactions, and multiple scattering can lead to important effects. Recently, for example, it was experimentally observed that these ingredients can lead to a fundamental, density-dependent dephasing of optical spin waves in a disordered atomic medium. Here, we go beyond the short-time and dilute limits considered previously, to develop a comprehensive theory of dephasing dynamics for arbitrary times and atomic densities. In particular, we develop a novel, non-perturbative theory based on strong disorder renormalization group (RG), in order to quantitatively predict the dominant role that near-field optical interactions between nearby neighbors has in driving the dephasing process. This theory also enables one to capture the key features of the many-atom dephasing dynamics in terms of an effective single-atom model. These results should shed light on the limits imposed by near-field interactions on quantum optical phenomena in dense atomic media, and illustrate the promise of strong disorder RG as a method of dealing with complex microscopic optical phenomena in such systems.

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31

Zou, Chen-Juan, Yue Li, Jia-Kun Xu, Jia-Bin You, Ching Eng Png y Wan-Li Yang. "Geometrical Bounds on Irreversibility in Squeezed Thermal Bath". Entropy 25, n.º 1 (9 de enero de 2023): 128. http://dx.doi.org/10.3390/e25010128.

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Irreversible entropy production (IEP) plays an important role in quantum thermodynamic processes. Here, we investigate the geometrical bounds of IEP in nonequilibrium thermodynamics by exemplifying a system coupled to a squeezed thermal bath subject to dissipation and dephasing, respectively. We find that the geometrical bounds of the IEP always shift in a contrary way under dissipation and dephasing, where the lower and upper bounds turning to be tighter occur in the situation of dephasing and dissipation, respectively. However, either under dissipation or under dephasing, we may reduce both the critical time of the IEP itself and the critical time of the bounds for reaching an equilibrium by harvesting the benefits of squeezing effects in which the values of the IEP, quantifying the degree of thermodynamic irreversibility, also become smaller. Therefore, due to the nonequilibrium nature of the squeezed thermal bath, the system–bath interaction energy has a prominent impact on the IEP, leading to tightness of its bounds. Our results are not contradictory with the second law of thermodynamics by involving squeezing of the bath as an available resource, which can improve the performance of quantum thermodynamic devices.

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32

Russo, Mattia, Kirsty E. McGhee, Tersilla Virgili, David G. Lidzey, Giulio Cerullo y Margherita Maiuri. "Dephasing Processes in the Molecular Dye Lumogen-F Orange Characterized by Two-Dimensional Electronic Spectroscopy". Molecules 27, n.º 20 (20 de octubre de 2022): 7095. http://dx.doi.org/10.3390/molecules27207095.

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Molecular dyes are finding more and more applications in photonics and quantum technologies, such as polaritonic optical microcavities, organic quantum batteries and single-photon emitters for quantum sensing and metrology. For all these applications, it is of crucial importance to characterize the dephasing mechanisms. In this work we use two-dimensional electronic spectroscopy (2DES) to study the temperature dependent dephasing processes in the prototypical organic dye Lumogen-F orange. We model the 2DES maps using the Bloch equations for a two-level system and obtain a dephasing time T2 = 53 fs at room temperature, which increases to T2 = 94 fs at 86 K. Furthermore, spectral diffusion processes are observed and modeled by a combination of underdamped and overdamped Brownian oscillators. Our results provide useful design parameters for advanced optoelectronic and photonic devices incorporating dye molecules.

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33

Newman, R. H. "Chemical-shift anisotropies can dominate dephasing in “dipolar dephasing” CP/MAS NMR experiments". Journal of Magnetic Resonance (1969) 96, n.º 2 (febrero de 1992): 370–75. http://dx.doi.org/10.1016/0022-2364(92)90089-p.

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34

Osad'ko, I. S. "Density matrix approach to optical dephasing in solids: Nonperturbative theory for dephasing processes". Chemical Physics Letters 167, n.º 5 (abril de 1990): 412–16. http://dx.doi.org/10.1016/0009-2614(90)85022-5.

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35

ZHANG, F. S. y R. M. LYNDEN-BELL. "PURE VIBRATIONAL DEPHASING OF TRIIODIDE IN LIQUIDS AND GLASSES". Modern Physics Letters A 18, n.º 02n06 (28 de febrero de 2003): 406–9. http://dx.doi.org/10.1142/s0217732303010570.

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A molecular dynamics model is developed to investigate the pure vibrational dephasing of [Formula: see text] in solvent at temperatures ranging from room temperature to 100 K. The triiodide ion is described by a valence bond model which responds to the field of the classical solvent molecules. We find that the pure dephasing rate does not change much with temperature. This result can then be interpreted in terms of of Kubo lineshape theory.

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36

Rahman, Atta Ur, Saeed Haddadi, Mohammad Reza Pourkarimi y Mehrdad Ghominejad. "Fidelity of quantum states in a correlated dephasing channel". Laser Physics Letters 19, n.º 3 (10 de febrero de 2022): 035204. http://dx.doi.org/10.1088/1612-202x/ac5040.

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Abstract The effects of classical correlations and associated decoherence on the fidelity dynamics of two qubits initially prepared in maximally entangled (ME) and coherent states are examined. In both the Markovian and non-Markovian regimes, the dynamics of fidelity in a correlated dephasing channel is probed. We show that fidelity decreases over time but does not disappear completely, implying that the output state does not become quite dissimilar from the input state under the effects of dephasing correlated channel. The ME state, in comparison, is more tolerant of the dephasing effects of the correlated channel than that of the maximally coherent state. Fidelity of the quantum states is significantly influenced by the degree of classical correlations between successive actions of the channel on the two qubits. As the amount of classical correlations in the implementation of the channel increases, the fidelity of the quantum states can be noticeably enhanced.

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37

Janutka, A., L. Jacak, J. Krasnyj y P. Machnikowski. "Phonon Dephasing of the Exciton in InAs/GaAs Quantum Dots". Open Systems & Information Dynamics 11, n.º 04 (diciembre de 2004): 391–400. http://dx.doi.org/10.1007/s11080-004-6630-6.

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The interaction of a exciton confined in a semiconductor quantum dot (QD) with bulk phonons (acoustical and optical) responsible for the exciton dephasing is studied. The decoherence of the exciton due to the creation of a polaron with long-living or decaying phonons is described. Characteristic dephasing times for an InAs / GaAs QD are estimated using Green function methods in order to determine fundamental time limitations for use of the QD exciton in quantum information processing.

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38

Kiselev, O. M. "Conditions for Phase Locking and Dephasing of Autoresonant Pumping". Nelineinaya Dinamika 15, n.º 3 (2019): 381–94. http://dx.doi.org/10.20537/nd190314.

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39

Palmero, Mikel, Miguel Ángel Simón y Dario Poletti. "Towards Generation of Cat States in Trapped Ions Set-Ups via FAQUAD Protocols and Dynamical Decoupling". Entropy 21, n.º 12 (9 de diciembre de 2019): 1207. http://dx.doi.org/10.3390/e21121207.

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The high fidelity generation of strongly entangled states of many particles, such as cat states, is a particularly demanding challenge. One approach is to drive the system, within a certain final time, as adiabatically as possible, in order to avoid the generation of unwanted excitations. However, excitations can also be generated by the presence of dissipative effects such as dephasing. Here we compare the effectiveness of Local Adiabatic and the FAst QUasi ADiabatic protocols in achieving a high fidelity for a target superposition state both with and without dephasing. In particular, we consider trapped ions set-ups in which each spin interacts with all the others with the uniform coupling strength or with a power-law coupling. In order to mitigate the effects of dephasing, we complement the adiabatic protocols with dynamical decoupling and we test its effectiveness. The protocols we study could be readily implemented with state-of-the-art techniques.

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40

Sun, Liuyang, Parveen Kumar, Zeyu Liu, Junho Choi, Bin Fang, Sebastian Roesch, Kha Tran et al. "Phonon Dephasing Dynamics in MoS2". Nano Letters 21, n.º 3 (28 de enero de 2021): 1434–39. http://dx.doi.org/10.1021/acs.nanolett.0c04368.

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41

Williams, Ryan B., Roger F. Loring y M. D. Fayer. "Vibrational Dephasing of Carbonmonoxy Myoglobin". Journal of Physical Chemistry B 105, n.º 19 (mayo de 2001): 4068–71. http://dx.doi.org/10.1021/jp010798o.

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42

Lonsky, Ch, P. Thomas y A. Weller. "Optical dephasing in disordered semiconductors". Physical Review Letters 63, n.º 6 (7 de agosto de 1989): 652–55. http://dx.doi.org/10.1103/physrevlett.63.652.

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43

Fagnola, Franco, John E. Gough, Hendra I. Nurdin y Lorenza Viola. "Mathematical models of Markovian dephasing". Journal of Physics A: Mathematical and Theoretical 52, n.º 38 (27 de agosto de 2019): 385301. http://dx.doi.org/10.1088/1751-8121/ab38ec.

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44

Tamascelli, Dario, Claudia Benedetti, Heinz-Peter Breuer y Matteo G. A. Paris. "Quantum probing beyond pure dephasing". New Journal of Physics 22, n.º 8 (11 de agosto de 2020): 083027. http://dx.doi.org/10.1088/1367-2630/aba0e5.

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45

Graham, Robert. "Dephasing of Bose-Einstein condensates". Journal of Modern Optics 47, n.º 14-15 (noviembre de 2000): 2615–27. http://dx.doi.org/10.1080/09500340008232185.

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46

Tomasiunas, R., J. Moniatte, I. Pelant, P. Gilliot y B. Hönerlage. "Femtosecond dephasing in porous silicon". Applied Physics Letters 68, n.º 23 (3 de junio de 1996): 3296–98. http://dx.doi.org/10.1063/1.116579.

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47

Cundiff, S. T., R. Hellmann, M. Koch, G. Mackh, A. Waag, G. Landwehr, W. H. Knox y E. O. Göbel. "Excitonic dephasing in semimagnetic semiconductors". Journal of the Optical Society of America B 13, n.º 6 (1 de junio de 1996): 1263. http://dx.doi.org/10.1364/josab.13.001263.

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48

Castellani, C., C. DiCastro, G. Kotliar y P. A. Lee. "Dephasing Time in Disordered Systems". Physical Review Letters 56, n.º 11 (17 de marzo de 1986): 1179–82. http://dx.doi.org/10.1103/physrevlett.56.1179.

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49

Weiser, S., T. Meier, J. Möbius, A. Euteneuer, E. J. Mayer, W. Stolz, M. Hofmann, W. W. Rühle, P. Thomas y S. W. Koch. "Disorder-induced dephasing in semiconductors". Physical Review B 61, n.º 19 (15 de mayo de 2000): 13088–98. http://dx.doi.org/10.1103/physrevb.61.13088.

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50

Huibers, A. G., M. Switkes, C. M. Marcus, K. Campman y A. C. Gossard. "Dephasing in Open Quantum Dots". Physical Review Letters 81, n.º 1 (6 de julio de 1998): 200–203. http://dx.doi.org/10.1103/physrevlett.81.200.

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