Enhancement of dynamical entanglement in a dispersive two-mode Jaynes–Cummings model via superposition of photon-added pair coherent state

Le, Thi Hong Thanh; Ho, Sy Chuong; Tran, Quang Dat; Đức, Trương Minh

doi:10.1088/1612-202x/acde74

Cited by 4 publications

(2 citation statements)

References 59 publications

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“…The Wigner function of a state can provide us with some important information about non-Gaussian feature as well as nonclassical properties of that state [28,37,60,62,63].…”

Section: Wigner Functionmentioning

confidence: 99%

“…The extension of the PCSs as pair cat states [53], even and odd charge coherent states [54,55], and nonlinear charge pair cat states [56] was proposed and their nonclassical properties have been studied. Besides, the addition of photons to two modes of the PCSs as two-mode photon-added PCSs [57], generalized photon-added PCS [58,59], and superposition of photon-added PCS [60] was introduced and their nonclassical properties have been studied so far. Recently, adding and subtracting photons simultaneously to two modes of the PCSs as photon-added-andsubtracted two modes PCS have been proposed and these properties have also been studied [37].…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of non-Gaussianity and nonclassicality of pair coherent states by superposition of photon addition and subtraction

Chuong,

Duc

2023

J. Phys. B: At. Mol. Opt. Phys.

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Pair coherent states (PCSs) as a kind of two-mode non-Gaussian and nonclassical states were introduced and studied. Some nonclassical characteristics of them such as two-mode sum-squeezing, two-mode antibunching, and entanglement have been well investigated. In this paper, we focus on studying the superposition of photon addition and subtraction to the PCSs called superposition of photon-added and photon-subtracted pair coherent states (SPAPSPCSs). Our main purpose is to show that the non-Gaussian feature and all the above-mentioned nonclassical properties of the SPAPSPCSs can be enhanced compared with the photon-added-and-subtracted two modes pair coherent states (PAASTMPCSs) and the original PCSs. In general, we demonstrate that the SPAPSPCSs have more enhanced non-Gaussian character and nonclassical properties than the PCSs and the PAASTMPCSs by examining the negativity of the Wigner function. Specifically, we indicate that both the SPAPSPCSs and the PAASTMPCSs can exist in two-mode sum-squeezing while the original PCSs (without photon-addition and photon-subtraction) cannot, and the degree of squeezing is stronger in the SPAPSPCSs than in the PAASTMPCSs. The obtained results also indicate that the superposition of photon addition and subtraction of the SPAPSPCSs plays a vital role in enhancing the two-mode antibunching property and the entanglement degree compared with the PCSs and the PAASTMPCSs.

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“…The Wigner function of a state can provide us with some important information about non-Gaussian feature as well as nonclassical properties of that state [28,37,60,62,63].…”

Section: Wigner Functionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhancement of non-Gaussianity and nonclassicality of pair coherent states by superposition of photon addition and subtraction

Chuong,

Duc

2023

J. Phys. B: At. Mol. Opt. Phys.

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Enhancing quantum features and teleportation fidelity of two-mode non-Gaussian states using conditional measurements

Truong,

Tran

2024

Laser Phys. Lett.

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The family of two-mode non-Gaussian entangled states, including the pair coherent states (PCSs) and their genealogies, has been extensively investigated regarding their quantum properties and their practical applications in quantum information. Specifically, certain states, such as the multiphoton catalytic pair coherent states (MCPCSs), have been newly introduced under specific experimental conditions. For a more feasible approach, in this paper, we introduce novel nonclassical states obtained by subtracting photons through conditional measurements using beam splitters applied to the two modes of the PCSs. These states are called pair coherent states with conditional measurements (PCSCMs). Our purpose is to demonstrate that the quantum features, such as entanglement, Einstein–Podolsky–Rosen (EPR) correlation, EPR steering, and the average fidelity in teleportation can be enhanced in comparison with both the original PCSs and the MCPCSs. In specific cases, several characteristics are observed in PCSCMs but not inspected in both PCSs and MCPCSs. In our findings, we prove that the quantum characteristics within the PCSCMs are influenced not just by the number of detected photons, denoted by variables k and l, but also by the discrepancy in photon numbers, especially by the difference of k − l.

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Improved experimental scheme for the generation of pair coherent state in traveling-wave optical fields

Truong,

Tran,

2024

Laser Phys. Lett.

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Pair coherent state (PCS) is a two-mode non-Gaussian state recently generated within spatially confined superconducting cavities. Under typical conditions, it is unsuitable for performing global quantum missions in open space. Several methods have been proposed to generate this state with the capability to propagate unrestrictedly. However, these methods employed an excessive amount of unnecessary physical resources or relied on coherent displacement within the low regime. This paper presents a novel experimental approach to generate this state, specifically designed for facilitating long-distance quantum information processing and communication tasks. The method involves the utilization of two weak cross-Kerr nonlinear media, two balanced beam splitters, and an on/off photodetector. Furthermore, the input comprises three CSs with high amplitudes. These physical resources are potentially accessible within existing technology. The analysis of success probability and fidelity demonstrates that the PCS can be successfully generated with a high coherent parameter amplitude, even in scenarios where the photodetector efficiency is low, provided that the coherent amplitudes are sufficiently high.

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Enhancement of dynamical entanglement in a dispersive two-mode Jaynes–Cummings model via superposition of photon-added pair coherent state

Cited by 4 publications

References 59 publications

Enhancement of non-Gaussianity and nonclassicality of pair coherent states by superposition of photon addition and subtraction

Enhancement of non-Gaussianity and nonclassicality of pair coherent states by superposition of photon addition and subtraction

Enhancing quantum features and teleportation fidelity of two-mode non-Gaussian states using conditional measurements

Improved experimental scheme for the generation of pair coherent state in traveling-wave optical fields

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