Thermal entanglement of a two-level atom and bimodal photons in a Kerr nonlinear coupler

Abbasi, Mohsen; Golshan, M.M.

doi:10.1016/j.physa.2013.07.068

Cited by 22 publications

(10 citation statements)

References 17 publications

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“…Negative regions of these two plots clearly illustrate the existence of amplitude powered squeezing in both a and b 1 modes for n = 2 and n = 3. Extending our observations in context of single-mode squeezing and intermodal squeezing we can state that the appearance of amplitude powered squeezing in a particular quadrature can be controlled by suitable choice of phase of input coherent state γ as the expressions for amplitude powered squeezing reported in (35) and (36) have a common functional…”

Section: Higher Order Squeezingmentioning

confidence: 61%

“…Only a few discrete efforts have recently been made to study higher order nonclassical effects and entanglement in optical couplers [13,[34][35][36][37][38][39], but except a recent study on codirectional nonlinear optical coupler reported by us [13], all the other efforts were limited to Kerr nonlinear optical coupler. For example, in 2004, Leonski and Miranowicz reported entanglement in Kerr nonlinear optical coupler [36] and pumped Kerr nonlinear optical coupler [39], subsequently entanglement sudden death [34] and thermally induced entanglement [35] were reported in the same system. Amplitude squared (higher order) squeezing was also reported in Kerr nonlinear optical coupler [38].…”

Section: Introductionmentioning

confidence: 99%

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Nonclassical properties of a contradirectional nonlinear optical coupler

et al. 2014

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We investigate the nonclassical properties of output fields propagated through a contradirectional asymmetric nonlinear optical coupler consisting of a linear waveguide and a nonlinear (quadratic) waveguide operated by second harmonic generation. In contrast to the earlier results, all the initial fields are considered weak and a completely quantum mechanical model is used here to describe the system. Perturbative solutions of Heisenberg's equations of motion for various field modes are obtained using Sen-Mandal technique. Obtained solutions are subsequently used to show the existence of single-mode and intermodal squeezing, single-mode and intermodal antibunching, two-mode and multi-mode entanglement in the output of contradirectional asymmetric nonlinear optical coupler. Further, existence of higher order nonclassicality is also established by showing the existence of higher order antibunching, higher order squeezing and higher order entanglement. Variation of observed nonclassical characters with different coupling constants and phase mismatch is discussed.Comment: 15 pages 7 figures. arXiv admin note: text overlap with arXiv:1403.664

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Section: Higher Order Squeezingmentioning

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Nonclassical properties of a contradirectional nonlinear optical coupler

et al. 2014

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“…The work is further motivated by the fact that recently several applications of nonclassical states have been reported. Specifically, squeezed states have played an important role in the studies related to phase diffusion [12,13], the detection of gravitational waves in LIGO experiments [14][15][16], teleportation of coherent states [17], and continuous variable quantum cryptography [18]. The rising demand for a single photon source can be fulfilled by an antibunched light source [19].…”

Section: Introductionmentioning

confidence: 99%

Lower‐ and Higher‐Order Nonclassical Properties of Photon Added and Subtracted Displaced Fock States

et al. 2019

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Nonclassical properties of photon added and subtracted displaced Fock states are studied using various witnesses of lower-and higher-order nonclassicality. Compact analytic expressions are obtained for the nonclassicality witnesses. Using those expressions, it is established that these states and the states that can be obtained as their limiting cases (except coherent states) are highly nonclassical as they show the existence of lower-and higher-order antibunching and sub-Poissonian photon statistics, in addition to the nonclassical features revealed through the Mandel Q M parameter, zeros of Q function, Klyshko's criterion, and Agarwal-Tara criterion. Further, some comparison between the nonclassicality of photon added and subtracted displaced Fock states have been performed using witnesses of nonclassicality. This has established that between the two types of non-Gaussianity inducing operations (i.e., photon addition and subtraction) used here, photon addition influences the nonclassical properties more strongly. Further, optical designs for the generation of photon added and subtracted displaced Fock states from squeezed vacuum state have also been proposed.

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“…As we have already mentioned, the atom-photon interaction normally takes place in a lossy cavity, so that the state of the total system has to be described by a mixed density operator [23] which satisfies the master equation [24]. The solution of the master equation may then be employed to extract any desired information, in particular, the degree of atom-photon entanglement [25].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of the Temporal Behavior of Entanglement between Photonic Binomial Distributions and a Two-Level Atom in a Damping Cavity

Yadollahi

Safaiee

Golshan

2019

IJOP

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In the present study, temporal behavior of entanglement between photonic binomial distributions and a two-level atom in a leaky cavity, in equilibrium with the environment at a temperature T, is studied. In this regard, the master equation is solved in the secular approximation for the density matrix, when the initial photonic distribution is binomial, while the atomic states obey the Boltzmann distribution. The atom-photon density matrix so calculated is then used to compute the negativity, as a measure of entanglement. The behavior of atom-photon entanglement is, consequently, determined as a function of time and temperature. To justify the behavior of atom-photon entanglement, moreover, we employ the total density matrix to compute and analyze the time evolution of the initial photonic binomial probability distribution. Our results, along with representative figures reveal that the atomphoton degree of entanglement exhibits oscillations while decaying with time and asymptotically vanishes. It is further demonstrated that an increase in the temperature gives rise to a decrease in the entanglement. The finer characteristics of the temporal behavior of the corresponding probability distribution and, consequently, the atom-photon entanglement is also given and discussed.

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Thermal entanglement of a two-level atom and bimodal photons in a Kerr nonlinear coupler

Cited by 22 publications

References 17 publications

Nonclassical properties of a contradirectional nonlinear optical coupler

Nonclassical properties of a contradirectional nonlinear optical coupler

Lower‐ and Higher‐Order Nonclassical Properties of Photon Added and Subtracted Displaced Fock States

Characteristics of the Temporal Behavior of Entanglement between Photonic Binomial Distributions and a Two-Level Atom in a Damping Cavity

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