Steady quantum coherence in non-equilibrium environment

Li, Sheng-Wen; Cai, C. Y.; Sun, Changhua

doi:10.1016/j.aop.2015.05.004

Cited by 54 publications

(67 citation statements)

References 39 publications

(100 reference statements)

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“…However, the Markovian master equation corresponding to nonlocal decoherence had already been discussed extensively in refs. ( [32,33,34] and refs. therein).…”

Section: Discussionmentioning

confidence: 99%

JRSP of three-particle state via three tripartite GHZ class in quantum noisy channels

Falaye

Sun

Camacho-Nieto

et al. 2016

Int. J. Quantum Inform.

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We present a scheme for joint remote state preparation (JRSP) of three-particle state via three tripartite Greenberger-Horne-Zeilinger (GHZ) entangled states as the quantum channel linking the parties. We use eight-qubit mutually orthogonal basis vector as measurement point of departure. The likelihood of success for this scheme has been found to be 1/8. However, by putting some special cases into consideration, the chances can be ameliorated to 1/4 and 1. The effects of amplitude-damping noise, phase-damping noise and depolarizing noise on this scheme have been scrutinized and the analytical derivations of fidelities for the quantum noisy channels have been presented. We found that for 0.55 ≤ η ≤ 1, the states conveyed through depolarizing channel lose more information than phase-damping channel while the information loss through amplitude damping channel is most minimal. Keywords IntroductionWhen a pair of particles is generated such that the quantum state of each particle cannot be elucidated independently, we referred to them as being entangled. One of the effortless ways to create entanglement is using a very powerful laser along with some very special crystals in order to entangle pair of photons which are the smallest unit of light. Experimental realization of quantum entanglement has been achieved and presented more elaborately in reference [1]. Quantum entanglement represents basic ingredient in quantum information processing. In fact, quantum entanglement 1 E-mail: fbjames11@physicist.net; babatunde.falaye@fulafia.edu.ng 2 E-mail: sunghdb@yahoo.com 3 E-mail: ocamacho@ipn.mx 4 E-mail: dongsh2@yahoo.com 1 lies in the heart of many quantum devices that are actively been developed. Entanglement has been found resourceful in quantum state sharing [2]. Information stored in quantum system can be teleported from one location to the other with the aid of shared entangled state [3]. Some other processes that exploit quantum entanglement include quantum dense coding [4], quantum secure direct communication [5] and remote state preparation (RSP) [6].The quantum teleportation can be described as a process by which quantum information is being transmitted from one location to another, with the aid of classical communication and erstwhile shared quantum entanglement between the sending and receiving location. In quantum teleportation, the sender has a particle of unknown state. Whereas, in RSP, the sender does not own the particle

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“…However, the Markovian master equation corresponding to nonlocal decoherence had already been discussed extensively in refs. ( [32,33,34] and refs. therein).…”

Section: Discussionmentioning

confidence: 99%

JRSP of three-particle state via three tripartite GHZ class in quantum noisy channels

Falaye

Sun

Camacho-Nieto

et al. 2016

Int. J. Quantum Inform.

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“…Now we introduce a coupling spectral density J(ω) := 2π k |g k | 2 δ(ω − ω k ) [28,40], then the above summation can be written as an integral for continuous bath modes (considering r k = r, ∆θ k = δθ are constants):…”

Section: System Dynamicsmentioning

confidence: 99%

“…Here we use the Born-Markovian approximation to derive a master equation for the TLS [28,40]. The master equation is derived froṁ…”

Section: Appendix A: Evolution Operatormentioning

confidence: 99%

Entropy dynamics of a dephasing model in a squeezed thermal bath

You

2018

Phys. Rev. A

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We study the entropy dynamics of a dephasing model, where a two-level system (TLS) is coupled with a squeezed thermal bath via non-demolition interaction. This model is exactly solvable, and the time dependent states of both the TLS and its bath can be obtained exactly. Based on these states, we calculate the entropy dynamics of both the TLS and the bath, and find that the dephasing rate of the system relies on the squeezing phase of the bath. In zero temperature and high temperature limits, both the system and bath entropy increases monotonically in the coarse grained time scale. Moreover, we find that the dephasing rate of the system relies on the squeezing phase of the bath, and this phase dependence cannot be precisely derived from the BornMarkovian approximation which is widely adopted in open quantum systems.

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“…Recently, it has been proposed that stable quantum features, such as steady-state coherence [21][22][23][24][25] and steady-state entanglement [26,27], may exist in open quantum systems interacting with nonequilibrium environments that sustain quantum nonequilibrium steady states [28][29][30]. Such nonequilibrium environments can be bosonic or fermionic, with different temperatures and/or chemical potentials.…”

Section: Introductionmentioning

confidence: 99%

“…Such nonequilibrium environments can be bosonic or fermionic, with different temperatures and/or chemical potentials. The surviving quantum features are essentially sustained by the nonequilibrium condition (temperature difference and/or chemical potential difference) in the environments interacting with the quantum system [21,22,24,[25][26][27]. In a certain sense, these quantum features do not only survive, but also thrive, in the noisy nonequilibrium environments, as they are actually born out of the interactions with the nonequilibrium environments.…”

Section: Introductionmentioning

confidence: 99%

Coherence enhanced quantum metrology in a nonequilibrium optical molecule

Wang

Cui

et al. 2018

New J. Phys.

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We explore the quantum metrology in an optical molecular system coupled to two environments with different temperatures, using a quantum master equation beyond secular approximation. We discover that the steady-state coherence originating from and sustained by the nonequilibrium condition can enhance quantum metrology. We also study the quantitative measures of the nonequilibrium condition in terms of the curl flux, heat current and entropy production at the steady state. They are found to grow with temperature difference. However, an apparent paradox arises considering the contrary behaviors of the steady-state coherence and the nonequilibrium measures in relation to the inter-cavity coupling strength. This paradox is resolved by decomposing the heat current into a population part and a coherence part. Only the latter, coherence heat current, is tightly connected to the steady-state coherence and behaves similarly with respect to the inter-cavity coupling strength. Interestingly, the coherence heat current flows from the low-temperature reservoir to the high-temperature reservoir, opposite to the direction of the population heat current. Our work offers a viable way to enhance quantum metrology for open quantum systems through steady-state coherence sustained by the nonequilibrium condition, which can be controlled and manipulated to maximize its utility. The potential applications go beyond quantum metrology and extend to areas such as device designing, quantum computation and quantum technology in general.

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Steady quantum coherence in non-equilibrium environment

Cited by 54 publications

References 39 publications

JRSP of three-particle state via three tripartite GHZ class in quantum noisy channels

JRSP of three-particle state via three tripartite GHZ class in quantum noisy channels

Entropy dynamics of a dephasing model in a squeezed thermal bath

Coherence enhanced quantum metrology in a nonequilibrium optical molecule

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