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Journal articles on the topic 'Optical squeezing'

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Author: Grafiati

Published: 4 June 2021

Last updated: 28 January 2023

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1

Wu, Zhenhua, Zhen Yi, Wenju Gu, Lihui Sun, and Zbigniew Ficek. "Enhancement of Optomechanical Squeezing of Light Using the Optical Coherent Feedback." Entropy 24, no. 12 (November 29, 2022): 1741. http://dx.doi.org/10.3390/e24121741.

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A coherent feedback scheme is used to enhance the degree of squeezing of the output field in a cavity optomechanical system. In the feedback loop, a beam splitter (BS) plays the roles of both a feedback controller and an input–output port. To realize effective enhancement, the output quadrature should take the same form as the input quadrature, and the system should operate at the deamplification situation in the meantime. This can be realized by choosing an appropriate frequency-dependent phase angle for the generalized quadrature. Additionally, both the transmissivity of the BS and the phase factor induced by time delays in the loop affect optical squeezing. For the fixed frequency, the optimal values of transmissivity and phase factor can be used to achieve the enhanced optical squeezing. The effect of optical losses on squeezing is also discussed. Optical squeezing is degraded by the introduced vacuum noise owing to the inefficient transmission in the loop. We show that the enhancement of squeezing is achievable with the parameters of the current experiments.

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2

Reid, M. D., and D. F. Walls. "Squeezing via optical bistability." Physical Review A 32, no. 1 (July 1, 1985): 396–401. http://dx.doi.org/10.1103/physreva.32.396.

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3

Han, Ya-Shuai, Xiao Zhang, Zhao Zhang, Jun Qu, and Jun-Min Wang. "Analysis of squeezed light source in band of alkali atom transitions based on cascaded optical parametric amplifiers." Acta Physica Sinica 71, no. 7 (2022): 074202. http://dx.doi.org/10.7498/aps.71.20212131.

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The squeezed light field in the band of alkali metal atomic transitions is an important quantum resource in the field of quantum information and precision measurement. The wavelengths of atomic transition lines (760–860 nm) are relatively short. Limited by the gray-tracking effect of nonlinear crystals, the squeezing degree of the squeezed light in this band generated by the optical parametric amplifiers is low. Now, the squeezing is about 3–5 dB. Considering the problems in the experimental generation of the squeezed light at the wavelengths of atomic transitions, the variation law of quantum noise of the light field output from the single optical parametric amplifier with its physical parameters is studied theoretically, and the optimal physical parameters are obtained. To further improve the squeezing in the band of alkali metal atomic transitions, the cascaded optical parametric amplifiers are considered. Based on the basic theory of the optical parametric amplifiers, the theoretical model of the cascaded optical parametric amplifiers is constructed, in which the optical loss and phase noise of the cascaded optical loops are considered. Based on this, the quantum noise characteristics of the light field output from the cascaded system versus the optical loss and phase noise are analyzed at the frequencies of 2 MHz and 100 kHz, respectively. It is found that for the squeezing at 2 MHz, cascading 2 to 3 optical parametric amplifiers can significantly improve the squeezing under the premise of the low optical path loss and phase noise; for the squeezing in the low-frequency band, the enhancement of the squeezing for the cascaded system is quite weak. Under the current experimental parameters, the squeezing at 2 MHz of the squeezed light on rubidium resonance can be improved from –5 dB to –7 dB by cascading another DOPA. For the squeezing at low frequency band, the cascaded system proves to be useless, and the efforts should be made to reduce the technique noise in the low frequency band. Furthermore, the quantum limit and spectral characteristics of the squeezed light field output from the cascaded system are further explored. This study can provide reference and guidance for the improvement in the squeezing degree of the band of atomic transitions.

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4

TINH, VO, and NGUYEN BA AN. "BIEXCITON kth POWER AMPLITUDE SQUEEZING DUE TO OPTICAL EXCITON–BIEXCITON CONVERSION." International Journal of Modern Physics B 14, no. 08 (March 30, 2000): 877–88. http://dx.doi.org/10.1142/s0217979200000716.

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We extend a previous paper on biexciton normal squeezing to the case of k th power amplitude squeezing in a quantum interacting system of photons, excitons and biexcitons. We find that the k th power amplitude squeezing depends on the characteristics of the initial coherent biexciton while the normal squeezing does not. Both the direction of maximal squeezing and the squeezing degree are derived as explicit functions of k. Especially, the squeezing degree always decreases with increasing k regardless of the initial conditions. All these properties are examined numerically.

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5

Sorokin, Arseny A., Elena A. Anashkina, Joel F. Corney, Vjaceslavs Bobrovs, Gerd Leuchs, and Alexey V. Andrianov. "Numerical Simulations on Polarization Quantum Noise Squeezing for Ultrashort Solitons in Optical Fiber with Enlarged Mode Field Area." Photonics 8, no. 6 (June 18, 2021): 226. http://dx.doi.org/10.3390/photonics8060226.

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Broadband quantum noise suppression of light is required for many applications, including detection of gravitational waves, quantum sensing, and quantum communication. Here, using numerical simulations, we investigate the possibility of polarization squeezing of ultrashort soliton pulses in an optical fiber with an enlarged mode field area, such as large-mode area or multicore fibers (to scale up the pulse energy). Our model includes the second-order dispersion, Kerr and Raman effects, quantum noise, and optical losses. In simulations, we switch on and switch off Raman effects and losses to find their contribution to squeezing of optical pulses with different durations (0.1–1 ps). For longer solitons, the peak power is lower and a longer fiber is required to attain the same squeezing as for shorter solitons, when Raman effects and losses are neglected. In the full model, we demonstrate optimal pulse duration (~0.4 ps) since losses limit squeezing of longer pulses and Raman effects limit squeezing of shorter pulses.

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6

Li, Guoyao, and Zhang-Qi Yin. "Squeezing Light via Levitated Cavity Optomechanics." Photonics 9, no. 2 (January 22, 2022): 57. http://dx.doi.org/10.3390/photonics9020057.

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Squeezing light is a critical resource in both fundamental physics and precision measurement. Squeezing light has been generated through optical-parametric amplification inside an optical resonator. However, preparing the squeezing light in an optomechanical system is still a challenge for the thermal noise inevitably coupled to the system. We consider an optically levitated nano-particle in a bichromatic cavity, in which two cavity modes could be excited by the scattering photons of the dual tweezers, respectively. Based on the coherent scattering mechanism, the ultra-strong coupling between the cavity field and the torsional motion of nano-particle could be achieved for the current experimental conditions. With the back-action of the optically levitated nano-particle, the broad single-mode squeezing light can be realized in the bad cavity regime. Even at room temperature, the single-mode light can be squeezed for more than 17 dB, which is far beyond the 3 dB limit. The two-mode squeezing light can also be generated, if the optical tweezers contain two frequencies, one is on the red sideband of the cavity mode, the other is on the blue sideband. The two-mode squeezing can be maximized near the boundary of the system stable regime and is sensitive to both the cavity decay rate and the power of the optical tweezers.

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7

Ono, Takafumi, Javier Sabines-Chesterking, Hugo Cable, Jeremy L. O’Brien, and Jonathan C. F. Matthews. "Optical implementation of spin squeezing." New Journal of Physics 19, no. 5 (May 16, 2017): 053005. http://dx.doi.org/10.1088/1367-2630/aa6e39.

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8

REYNAUD, S., and E. GIACOBINO. "SQUEEZING IN BISTABLE OPTICAL SYSTEMS." Le Journal de Physique Colloques 49, no. C2 (June 1988): C2–477—C2–482. http://dx.doi.org/10.1051/jphyscol:19882112.

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9

GIRI, DILIP KUMAR, and P. S. GUPTA. "nTH-ORDER AMPLITUDE SQUEEZING EFFECTS OF RADIATION IN MULTIPHOTON PROCESSES." International Journal of Modern Physics B 20, no. 16 (June 30, 2006): 2265–81. http://dx.doi.org/10.1142/s0217979206034686.

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Squeezing of the electromagnetic field is a purely quantum mechanical phenomenon and this quantum effect is expected to manifest itself in optical processes in which the nonlinear response of the system to the radiation field plays an important role. It has generated a great deal of interest in view of the possibility of reducing the noise of an optical signal below the vacuum limit i.e. zero-point oscillations. In this paper the concept of nth-order amplitude squeezing is introduced in the fundamental mode in four- and six-wave mixing processes as a generalization of the higher-order squeezing under short-time approximation based on a fully quantum mechanical approach. It established the coupled Heisenberg equations of motion involving real and imaginary parts of the quadrature operators. The condition for occurrence of nth-order squeezing is obtained from which higher-order squeezing upto n=3 are studied. Dependence of squeezing on photon number is also established. The conditions for obtaining maximum and minimum squeezing are obtained. The method of present investigation can be applied to any higher-order non-linear optical processes and the technique can also be extended for studying squeezing in any N-photon process in general. Further, nth-order squeezing of radiation in N-photon process can also be investigated. The results obtained may help in selecting a suitable process to generate optimum squeezing in the radiation field.

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10

Bergman, K., and H. A. Haus. "Squeezing in fibers with optical pulses." Optics Letters 16, no. 9 (May 1, 1991): 663. http://dx.doi.org/10.1364/ol.16.000663.

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11

Collett, M. J., and D. F. Walls. "Squeezing spectra for nonlinear optical systems." Physical Review A 32, no. 5 (November 1, 1985): 2887–92. http://dx.doi.org/10.1103/physreva.32.2887.

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12

Levi, Barbara Goss. "Still More Squeezing of Optical Noise." Physics Today 40, no. 3 (March 1987): 20–22. http://dx.doi.org/10.1063/1.2819947.

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13

Pérez-Arjona, I., E. Roldán, and G. J. de Valcárcel. "Quantum squeezing of optical dissipative structures." Europhysics Letters (EPL) 74, no. 2 (April 2006): 247–53. http://dx.doi.org/10.1209/epl/i2005-10530-3.

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14

Heersink, Joel, Vincent Josse, Gerd Leuchs, and Ulrik L. Andersen. "Efficient polarization squeezing in optical fibers." Optics Letters 30, no. 10 (May 15, 2005): 1192. http://dx.doi.org/10.1364/ol.30.001192.

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15

Alam, Mohosin, Swapan Mandal, and Mohamed Ridza Wahiddin. "Squeezing, mixed mode squeezing, amplitude squared squeezing and principal squeezing in a non-degenerate parametric oscillator." Optik 157 (March 2018): 1035–52. http://dx.doi.org/10.1016/j.ijleo.2017.11.113.

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16

Abebe, Tamirat, Nebiyu Gemechu, Chimdessa Gashu, Kebede Shogile, Solomon Hailemariam, and Shimelis Adisu. "The Quantum Analysis of Nonlinear Optical Parametric Processes with Thermal Reservoirs." International Journal of Optics 2020 (May 14, 2020): 1–11. http://dx.doi.org/10.1155/2020/7198091.

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In this paper, employing the stochastic differential equations associated with the normal ordering, the quantum properties of a nondegenerate three-level cascade laser with a parametric amplifier and coupled to a two-mode thermal reservoir are thoroughly analyzed. Particularly, the enhancement of squeezing and the amplification of photon entanglement of the two-mode cavity light are investigated. It is found that the two cavity modes are strongly entangled and the degree of entanglement is directly related to the two-mode squeezing. Despite the fact that the entanglement and squeezing decrease with the increment of the mean photon number of the thermal reservoir, strong amount of these nonclassical properties can be generated for a considerable amount of thermal noise with the help of the nonlinear crystal introduced into the laser cavity. Moreover, the squeezing and entanglement of the cavity radiation enhance with the rate of atomic injection.

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17

Otterstrom, N., R. C. Pooser, and B. J. Lawrie. "Nonlinear optical magnetometry with accessible in situ optical squeezing." Optics Letters 39, no. 22 (November 14, 2014): 6533. http://dx.doi.org/10.1364/ol.39.006533.

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18

Giri, Dilip Kumar, and Binod Kumar Choudhary. "Sum Squeezing of the Field Amplitude in Frequency Upconversion Process." International Journal of Optics 2020 (February 1, 2020): 1–9. http://dx.doi.org/10.1155/2020/1483710.

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Sum squeezing of the field amplitude is studied in the nondegenerate and degenerate frequency upconversion process under the short interaction time. It is shown that sum squeezing can be converted into normal squeezing via sum-frequency generation in the nondegenerate frequency upconversion process, while the amplitude-squared squeezing of the fundamental mode directly changed into the squeezing of the harmonic in the degenerate frequency upconversion process. All reachable conditions of uncorrelated modes for obtaining a sum squeezing in two modes and its dependence on the squeezing of individual field modes are investigated. It is found that the squeezed states are associated with large number of pump photons. It is also confirmed that the higher-order squeezing (sum squeezing) is directly associated with coupling of the field and interaction time.

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19

KASAI, KATSUYUKI, and CLAUDE FABRE. "SQUEEZING OF THE PUMP BEAM IN OPTICAL PARAMETRIC INTERACTION." Journal of Nonlinear Optical Physics & Materials 05, no. 04 (October 1996): 921–27. http://dx.doi.org/10.1142/s0218863596000659.

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We investigate the squeezing of the pump beam in optical parametric interaction. According to our semi-classical calculation, the pump beam reflected back from a Triply Resonant Optical Parametric Oscillator (TROPO) is squeezed.1 In this paper we preliminarily demonstrate the squeezing of the pump beam by using a semimonolithic KTP TROPO pumped by a frequency doubled LD-pumped YAG laser. Noise reduction of 1.2 dB below the shot noise level is observed in the bistable region of the parametric oscillation.

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20

TAKEOKA, Masahiro, Daisuke FUJISHIMA, and Fumihiko KANNARI. "Ultrashort Optical Pulse Squeezing in Nonlinear Fibers." Review of Laser Engineering 30, no. 8 (2002): 443–49. http://dx.doi.org/10.2184/lsj.30.443.

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21

Margalit, Moti, Charles Yu, Erich Ippen, and Hermann Haus. "Cross phase modulation squeezing in optical fibers." Optics Express 2, no. 3 (February 2, 1998): 72. http://dx.doi.org/10.1364/oe.2.000072.

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22

Friberg, S. R., S. Machida, M. J. Werner, A. Levanon, and Takaaki Mukai. "Observation of Optical Soliton Photon-Number Squeezing." Physical Review Letters 77, no. 18 (October 28, 1996): 3775–78. http://dx.doi.org/10.1103/physrevlett.77.3775.

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23

Fabre, C., E. Giacobino, A. Heidmann, L. Lugiato, S. Reynaud, M. Vadacchino, and Wang Kaige. "Squeezing in detuned degenerate optical parametric oscillators." Quantum Optics: Journal of the European Optical Society Part B 2, no. 2 (April 1990): 159–87. http://dx.doi.org/10.1088/0954-8998/2/2/006.

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24

Yang, Guojian, Gang Hu, and Zuqia Huang. "Squeezing in driven two-photon optical systems." Quantum Optics: Journal of the European Optical Society Part B 5, no. 2 (April 1993): 121–29. http://dx.doi.org/10.1088/0954-8998/5/2/007.

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25

Werner, M. J., M. G. Raymer, M. Beck, and P. D. Drummond. "Ultrashort pulsed squeezing by optical parametric amplification." Physical Review A 52, no. 5 (November 1, 1995): 4202–13. http://dx.doi.org/10.1103/physreva.52.4202.

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26

Castelli, F., L. A. Lugiato, and M. Vadacchino. "Squeezing in optical bistability without adiabatic elimination." Il Nuovo Cimento D 10, no. 2 (February 1988): 183–220. http://dx.doi.org/10.1007/bf02450099.

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27

Dwyer, Sheila E., Georgia L. Mansell, and Lee McCuller. "Squeezing in Gravitational Wave Detectors." Galaxies 10, no. 2 (March 9, 2022): 46. http://dx.doi.org/10.3390/galaxies10020046.

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Injecting optical squeezed states of light, a technique known as squeezing, is now a tool for gravitational wave detection. Its ability to reduce quantum noise is helping to reveal more gravitational wave transients, expanding the catalog of observations in the last observing run. This review introduces squeezing and its history in the context of gravitational-wave detectors. It overviews the benefits, limitations and methods of incorporating squeezing into advanced interferometers, emphasizing the most relevant details for astrophysics instrumentation.

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28

SOMIYA, Kentaro. "Application of Optical Squeezing to Gravitational-Wave Detectors." Review of Laser Engineering 37, no. 2 (2009): 108–12. http://dx.doi.org/10.2184/lsj.37.108.

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29

Bogolubov, N. N., A. S. Shumovsky, and T. Quang. "Spectrum of squeezing in collective double optical resonance." Journal of Physics B: Atomic, Molecular and Optical Physics 21, no. 6 (March 28, 1988): 1091–99. http://dx.doi.org/10.1088/0953-4075/21/6/016.

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30

Kanter, Gregory, Prem Kumar, Rostislav Roussev, Jonathan Kurz, Krishnan Parameswaran, and Martin Fejer. "Squeezing in a LiNbO3 integrated optical waveguide circuit." Optics Express 10, no. 3 (February 11, 2002): 177. http://dx.doi.org/10.1364/oe.10.000177.

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31

Aravind, P. K. "SU(2) squeezing in the optical Bloch equations." Journal of the Optical Society of America B 4, no. 11 (November 1, 1987): 1847. http://dx.doi.org/10.1364/josab.4.001847.

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32

Hordell, Joshua, Daniel Benedicto-Orenes, Plamen G. Petrov, Anna U. Kowalczyk, Giovanni Barontini, and Vincent Boyer. "Transport of spatial squeezing through an optical waveguide." Optics Express 26, no. 18 (August 21, 2018): 22783. http://dx.doi.org/10.1364/oe.26.022783.

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33

Said, R. S., M. R. B. Wahiddin, and B. A. Umarov. "Squeezing in multi-mode nonlinear optical state truncation." Physics Letters A 365, no. 5-6 (June 2007): 380–85. http://dx.doi.org/10.1016/j.physleta.2007.01.042.

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34

Galatola, P., L. A. Lugiato, M. G. Porreca, and P. Tombesi. "Optical switching by variation of the squeezing phase." Optics Communications 81, no. 3-4 (February 1991): 175–78. http://dx.doi.org/10.1016/0030-4018(91)90634-p.

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35

Garcia-Fernandez, P., and Peng Zhou. "Squeezing from Raman Scattering in Optical Parametric Oscillators." Journal of Modern Optics 41, no. 12 (December 1994): 2259–73. http://dx.doi.org/10.1080/09500349414552121.

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36

TINH, VO, DO HUU NHA, and NGUYEN BA AN. "BIEXCITON SQUEEZING DUE TO OPTICAL EXCITON-BIEXCITON CONVERSION." International Journal of Modern Physics B 14, no. 01 (January 10, 2000): 91–100. http://dx.doi.org/10.1142/s0217979200000091.

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We theoretically investigate the evolution of biexcitons from a coherent into a squeezed state in a fully quantum system described by a trilinear Hamiltonian allowing the transition "photons + excitons ⇌ biexcitons". Curious dependences of the direction and degree of biexciton squeezing on the initial states of photons and excitons are obtained. The theoretical results are well reproduced by numerical calculations.

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37

Honegger, Reinhard, and Alfred Rieckers. "Squeezing of optical states on the CCR-algebra." Publications of the Research Institute for Mathematical Sciences 33, no. 6 (1997): 869–92. http://dx.doi.org/10.2977/prims/1195144880.

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38

Honarasa, G. R., M. Hatami, and M. K. Tavassoly. "Quantum Squeezing of Dark Solitons in Optical Fibers." Communications in Theoretical Physics 56, no. 2 (August 2011): 322–26. http://dx.doi.org/10.1088/0253-6102/56/2/23.

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39

Venkateswaran, Uma D. "Squeezing carbon nanotubes." physica status solidi (b) 241, no. 14 (November 2004): 3345–51. http://dx.doi.org/10.1002/pssb.200405236.

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40

BHATTACHERJEE, ARANYABHUTI. "ELECTRON SHELVING INDUCED SQUEEZING IN FLUORESCENT LIGHT EMITTED BY COLD 4He ATOMS IN AN OPTICAL LATTICE: COHERENT CONTROL BY A WEAK AXIAL MAGNETIC FIELD." Modern Physics Letters B 15, no. 20 (August 30, 2001): 847–55. http://dx.doi.org/10.1142/s0217984901002609.

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We report theoretical calculations on the effect of polarization gradient, atomic motion and an axial magnetic field on quantum noise reduction in the resonant fluorescence emitted by a cloud of cold Helium atoms in an optical lattice. The polarization gradient induces squeezing of the electromagnetic field at selected points on the optical lattice, together with a dark resonance in the emitted fluorescence, the origin of which is traced back to electron shelving. We find that the localization of the atoms in the optical lattice destroys squeezing, but can be recovered in the presence of an axial magnetic field.

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41

BASEIA, B., REETA VYAS, and V. S. BAGNATO. "PARTICLE TRAPPING BY OSCILLATING FIELDS: CONNECTING SQUEEZING WITH COOLING." Modern Physics Letters B 10, no. 14 (June 20, 1996): 661–69. http://dx.doi.org/10.1142/s0217984996000730.

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The first observation of the squeezing effect outside the optical domain was reported very recently for trapped atoms [D. M. Meekhof et al., Phys. Rev. Lett.76, 1796 (1996)]. Pursuing this line and a sequel of previous works of ours we employ a model by Glauber and a method of invariants by Lewis and Riesenfeld to establish a connection between the squeezing and the cooling effects in the system. From this connection the occurrence of squeezing could be detected through the measurement of the dispersion in the variable [Formula: see text] and of the temperature.

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42

ZHOU, QING-CHUN, and SHI NING ZHU. "ATOMIC DIPOLE SQUEEZING IN THE DEGENERATE Λ QUANTUM BEAT THREE-LEVEL SYSTEM." International Journal of Modern Physics B 20, no. 20 (August 10, 2006): 2889–98. http://dx.doi.org/10.1142/s0217979206034911.

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By using the full quantum theory, we investigate the time evolution of the atomic dipole squeezing parameters of a Λ-type three-level atom interacting with a single-mode coherent optical field, and study the influence of the initial coherent-field intensity, the initial atomic coherence, the initial populations and energy splitting of the two lower atomic levels on the atomic dipole squeezing. The influence of a classical external driving field coupling to the atom on the atomic dipole squeezing is also explored at the end of the paper.

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43

CHUA, SHEON, MICHAEL STEFSZKY, CONOR MMOW-LOWRY, BEN C. BUCHLER, KIRK MCKENZIE, DANIEL A. SHADDOCK, PING KOY LAM, and DAVID E. MCCLELLAND. "QUANTUM SQUEEZING IN ADVANCED GRAVITATIONAL WAVE DETECTORS." International Journal of Modern Physics D 20, no. 10 (September 2011): 2043–49. http://dx.doi.org/10.1142/s0218271811020159.

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Second generation ground-based gravitational wave detectors, scheduled to be operating by the middle of this decade, will be limited in sensitivity over much of their detection range by optical quantum noise. As they will be operating at power levels close to the tolerance of the optical components, significant further improvement in sensitivity will require the use of quantum optical techniques such as the injection of squeezed states. In this paper we briefly review squeezing and plans for its implementation into advanced gravitational wave detectors.

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44

Kielich, S., M. Kozierowski, and R. Tanaś. "Photon Antibunching and Squeezing." Optica Acta: International Journal of Optics 32, no. 9-10 (September 1985): 1023–37. http://dx.doi.org/10.1080/713821848.

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45

Liu, Peng, Juan Li, Xiao Xiang, Ming-Tao Cao, Rui-Fang Dong, Tao Liu, and Shou-Gang Zhang. "Experimental scheme of non-critical squeezed light field detection." Acta Physica Sinica 71, no. 1 (2022): 010301. http://dx.doi.org/10.7498/aps.71.20211212.

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The squeezed state, as an important quantum resource, has great potential applications in quantum computing, quantum communication and precision measurement. In the noncritically squeezed light theory, the predicted noncritically squeezed light can be generated by breaking the spontaneous rotational symmetry occurring in a degenerate optical parametric oscillator (DOPO) pumped above threshold. The reliability of this kind of squeezing is crucially important, as its quantum performance is robust to the pump power in experiment. However, the detected squeezing degrades rapidly in detection, because the squeezed mode orientation diffuses slowly, resulting in a small mode mismatch during the homodyne detection. In this paper, we propose an experimentally feasible scheme to detect noncritically squeezing reliable by employing the spatial mode swapping technic. Theoretically, the dynamic fluctuation aroused by random mode rotation in the squeezing detection can be compensated for perfectly, and 3 dB squeezing can be achieved robustly even with additional vacuum noise. Our scheme makes an important step forward for the experimental generation of noncritically squeezed light.

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46

Mouloudakis, George, and Peter Lambropoulos. "Squeezed Coherent States in Double Optical Resonance." Photonics 8, no. 3 (March 5, 2021): 72. http://dx.doi.org/10.3390/photonics8030072.

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In this work, we consider a “Λ-type” three-level system where the first transition is driven by a radiation field initially prepared in a squeezed coherent state, while the second one by a weak probe field. If the squeezed field is sufficiently strong to cause Stark splitting of the states it connects, such a splitting can be monitored through the population of the probe state, a scheme also known as “double optical resonance”. Our results deviate from the well-studied case of coherent driving indicating that the splitting profile shows great sensitivity to the value of the squeezing parameter, as well as its phase difference from the complex displacement parameter. The theory is cast in terms of the resolvent operator where both the atom and the radiation field are treated quantum mechanically, while the effects of squeezing are obtained by appropriate averaging over the photon number distribution of the squeezed coherent state.

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47

Dat, Tran Quang, Truong Minh Thang, and Truong Minh Duc. "Non-classical properties and generation schemes of superposition of multiple-photon-added two-mode squeezed vacuum state." Hue University Journal of Science: Natural Science 130, no. 1B (June 29, 2021): 5–12. http://dx.doi.org/10.26459/hueunijns.v130i1b.6028.

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In this paper, we study some non-classical properties and propose the generation schemes of the superposition of multiple-photon-added two-mode squeezed vacuum state (SMPA-TMSVS). Based on the Wigner function, we clarify that this state is a non-Gaussian state, while the original two-mode squeezed vacuum state (TMSVS) is a Gaussian state. Besides, the SMPA-TMSVS is sum squeezing, as well as difference squeezing. In particular, the manifestation of the sum squeezing and the difference squeezing in the SMPA-TMSVS becomes more pronounced when increasing parameters r and e. In addition, by exploiting the schemes of photon-added superposition in the usual order, we give some schemes that the SMPA-TMSVS can be generated with the higher-order photon-added superposition by using some optical devices.

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48

Anh, Nguyen Pham Quynh. "Generation of plasmon-polaritons in epsilon-near-zero polaritonic metamaterial." Hue University Journal of Science: Natural Science 130, no. 1B (June 29, 2021): 35–41. http://dx.doi.org/10.26459/hueunijns.v130i1b.6180.

Full text

Abstract:

In this paper, we study some non-classical properties and propose the generation schemes of the superposition of multiple-photon-added two-mode squeezed vacuum state (SMPA-TMSVS). Based on the Wigner function, we clarify that this state is a non-Gaussian state, while the original two-mode squeezed vacuum state (TMSVS) is a Gaussian state. Besides, the SMPA-TMSVS is sum squeezing, as well as difference squeezing. In particular, the manifestation of the sum squeezing and the difference squeezing in the SMPA-TMSVS becomes more pronounced when increasing parameters r and e. In addition, by exploiting the schemes of photon-added superposition in the usual order, we give some schemes that the SMPA-TMSVS can be generated with the higher-order photon-added superposition by using some optical devices.

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49

Bhattacherjee, Aranya B., and Deepti Sharma. "Enhanced spin squeezing and quantum entanglement near the critical point of the Jaynes–Cummings–Dicke model." International Journal of Modern Physics B 31, no. 09 (April 10, 2017): 1750062. http://dx.doi.org/10.1142/s021797921750062x.

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Abstract:

We investigate spin squeezing (SS) and the quantum Fisher information (QFI) for the Jaynes–Cummings–Dicke (JCD) model in a two-component atomic Bose–Einstein condensate (BEC) inside an optical cavity. Analytical expressions for spin squeezing and the reciprocal of the quantum Fisher information per particle (RMQFI) are derived using the frozen spin approximation. It is shown that in the superradiant phase near the critical point, maximum squeezing and maximum quantum entanglement occur and thus the critical point emerges as a useful resource for precision measurements. In the presence of decoherence and particle loss, we show that gradually with time, even though the ability of squeezing and entanglement generation are weakened, yet significant amounts are still present which can be relevant to quantum information processing and precision spectroscopy.

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50

Nehra, Rajveer, Ryoto Sekine, Luis Ledezma, Qiushi Guo, Robert M. Gray, Arkadev Roy, and Alireza Marandi. "Few-cycle vacuum squeezing in nanophotonics." Science 377, no. 6612 (September 16, 2022): 1333–37. http://dx.doi.org/10.1126/science.abo6213.

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Abstract:

One of the most fundamental quantum states of light is the squeezed vacuum, in which noise in one of the quadratures is less than the standard quantum noise limit. In nanophotonics, it remains challenging to generate, manipulate, and measure such a quantum state with the performance required for a wide range of scalable quantum information systems. Here, we report the development of a lithium niobate–based nanophotonic platform to demonstrate the generation and all-optical measurement of squeezed states on the same chip. The generated squeezed states span more than 25 terahertz of bandwidth supporting just a few optical cycles. The measured 4.9 decibels of squeezing surpass the requirements for a wide range of quantum information systems, demonstrating a practical path toward scalable ultrafast quantum nanophotonics.

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