Nonclassical properties and entanglement generation in an optical cavity containing two atomic Bose–Einstein condensates

2020 ◽  
Vol 34 (06) ◽  
pp. 2050075
Author(s):  
Ren-Fei Zheng ◽  
Qi-Hui Jiang ◽  
Lu Zhou ◽  
Wei-Ping Zhang
Keyword(s):  
Optical Cavity ◽  
Significant Loss ◽  
Cavity Field ◽  
Entanglement Generation ◽  
Field Coupling ◽  
Nonclassical Properties ◽  
Strong Atom ◽  
Collisional Interactions ◽  
Bose Einstein ◽  
Poissonian Statistics

We consider the model of a weakly driven optical cavity containing two clouds of atomic Bose–Einstein condensates (BECs). Nonclassical photon correlations and correlations between the two atomic BECs are investigated under different cavity conditions including strong atom-field coupling and bad cavity regime. We show that the nonlinear interatom collisional interactions in BEC leads to a significant loss of cavity light coherence. Various types of nonclassical properties are investigated such as sub-Poissonian statistics, antibunching and entanglement. We show that the entanglement can be generated between BECs and the cavity field. The time evolution of entanglement is also numerically studied.

scholarly journals Strong atom–field coupling for Bose–Einstein condensates in an optical cavity on a chip

Nature ◽  
2007 ◽  
Vol 450 (7167) ◽  
pp. 272-276 ◽  
Author(s):  
Yves Colombe ◽  
Tilo Steinmetz ◽  
Guilhem Dubois ◽  
Felix Linke ◽  
David Hunger ◽  
...  
Keyword(s):  
Optical Cavity ◽  
Field Coupling ◽  
Strong Atom ◽  
Bose Einstein

Intrinsic decoherence effects on quantum dynamics of the nondegenerate two-photon f-deformed Jaynes–Cummings model governed by the Milburn equation

2007 ◽  
Vol 85 (10) ◽  
pp. 1071-1096 ◽  
Author(s):  
M H Naderi
Keyword(s):  
Quantum Dynamics ◽  
Cavity Field ◽  
Intrinsic Decoherence ◽  
Two Photon ◽  
Field Coupling ◽  
Nonclassical Properties ◽  
Quadrature Squeezing ◽  
Model Hamiltonian ◽  
Atomic Dipole ◽  
Atomic Population Inversion

In this paper, we study the influence of the intrinsic decoherence on quantum statistical properties of a generalized nonlinear interacting atom–field system, i.e., the nondegenerate two-photon f-deformed Jaynes–Cummings model governed by the Milburn equation. The model contains the nonlinearities of both the cavity–field and the atom–field coupling. Until now, very few exact solutions of nonlinear systems that include a form of decoherence have been presented. The main achievement of the present work is to find exact analytical solutions for the quantum dynamics of the nonlinear model under consideration in the presence of intrinsic decoherence. With the help of a supersymmetric transformation, we first put the model Hamiltonian into an appropriate form for treating the intrinsic decoherence. Then, by applying the superoperator technique, we find an exact solution of the Milburn equation for a nondegenerate two-photon f-deformed Jaynes–Cummings model. We use this solution to investigate the effects of the intrinsic decoherence on temporal evolution of various nonclassical properties of the system, i.e., atomic population inversion, atomic dipole squeezing, atom–field entanglement, sub-Poissonian photon statistics, cross correlation between the two modes and quadrature squeezing of the cavity field. Particularly, we compare the numerical results for three different cases of two-mode deformed, one-mode deformed, and nondeformed Jaynes–Cummings models. PACS Nos.: 42.50.Ct, 42.50.Dv, 03.65.Yz

Bose–Einstein condensates in an optical cavity with sub-recoil bandwidth

2016 ◽  
Vol 122 (12) ◽  
Author(s):  
J. Klinder ◽  
H. Keßler ◽  
Ch. Georges ◽  
J. Vargas ◽  
A. Hemmerich
Keyword(s):  
Optical Cavity ◽  
Bose Einstein

scholarly journals Stimulated emission of relic gravitons and their super-Poissonian statistics

2019 ◽  
Vol 34 (23) ◽  
pp. 1950185 ◽  
Author(s):  
Massimo Giovannini
Keyword(s):  
Coherent State ◽  
Second Order ◽  
Stimulated Emission ◽  
Initial State ◽  
Einstein Distribution ◽  
Hubble Radius ◽  
Initial States ◽  
Bose Einstein ◽  
Final Degree ◽  
Poissonian Statistics

The degree of second-order coherence of the relic gravitons produced from the vacuum is super-Poissonian and larger than in the case of a chaotic source characterized by a Bose–Einstein distribution. If the initial state does not minimize the tensor Hamiltonian and has a dispersion smaller than its averaged multiplicity, the overall statistics is by definition sub-Poissonian. Depending on the nature of the sub-Poissonian initial state, the final degree of second-order coherence of the quanta produced by stimulated emission may diminish (possibly even below the characteristic value of a chaotic source) but it always remains larger than one (i.e. super-Poissonian). When the initial statistics is Poissonian (like in the case of a coherent state or for a mixed state weighted by a Poisson distribution) the degree of second-order coherence of the produced gravitons is still super-Poissonian. Even though the quantum origin of the relic gravitons inside the Hubble radius can be effectively disambiguated by looking at the corresponding Hanbury Brown–Twiss correlations, the final distributions caused by different initial states maintain their super-Poissonian character which cannot be altered.

scholarly journals Spin-momentum entanglement in a Bose–Einstein condensate

2020 ◽  
Vol 22 (44) ◽  
pp. 25669-25674
Author(s):  
Sumit Suresh Kale ◽  
Yijue Ding ◽  
Yong P. Chen ◽  
Bretislav Friedrich ◽  
Sabre Kais
Keyword(s):  
Degrees Of Freedom ◽  
Raman Laser ◽  
Einstein Condensate ◽  
Spin States ◽  
Field Coupling ◽  
Bose Einstein Condensate ◽  
Bose Einstein ◽  
Spin Momentum

Mechanisms including two types of Raman laser coupling (Ω1 & Ω2) and rf field coupling (Ωrf) are applied to drive transitions between different hyperfine spin states. We investigated the entanglement between the spin and momentum degrees of freedom.

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