Quantum discord of the Werner state in noninertial frames

Sanchez, M. A. Mercado; Sun, Guo-Hua; Dong, Shi‐Hai

doi:10.1088/1402-4896/abbf72

Cited by 7 publications

(2 citation statements)

References 53 publications

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“…On the other hand, the population crossover observed in figure 3 can be understood in terms of an entanglement dynamics between the SQUID and the photons, incident and generated. Recently, the single-mode approach was used to characterized the entanglement measures for pseudo-pure states in accelerated frames [22,23]. In this context, one can quantify the entanglement between the SQUID and the photons by using Entanglement of Formation [24][25][26], which is defined as…”

Section: Entanglement Dynamicsmentioning

confidence: 99%

Entanglement dynamics of a dc SQUID interacting with a single-mode radiation field

2021

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In this work, we study the coupling between a superconducting device as a dc SQUID, simulated from an artificial atom with two degrees of freedom, and a single-mode radiation field for the information transference process. We demonstrate that the population transfer among the energy levels of the artificial atom yields entanglement dynamics, which leads to the generation of a pair of photons. Moreover, we show the quantum information transference between the internal modes of the superconducting device, initially in a maximally entangled state, and the radiation field. The artificial atom absorbs the photon, and the radiation field modes become entangled as quantum coherence is transmitted from the superconducting device to the photons. These results strengthen the applicability of superconducting devices for the transference of quantum information, contributing to promising applications in emerging quantum technologies.

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Section: Entanglement Dynamicsmentioning

confidence: 99%

Entanglement dynamics of a dc SQUID interacting with a single-mode radiation field

2021

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“…Along with this line, we have carried out the entanglement measures of the tripartite and tetrapartite systems initialed in the pure or mixed states such as the GHZ, the W-class and the Werner states in noninertial frame. [40][41][42][43][44][45][46][47] Among them, the tripartite entanglement measures for a generalized GHZ state including a polar angle θ have been explored in the noninertial frame. [44] In this work, we are going to investigate the tetrapartite entanglement measures of a generalized GHZ state when the observers are moving in a uniform acceleration.…”

Section: Introductionmentioning

confidence: 99%

Tetrapartite entanglement measures of generalized GHZ state in the noninertial frames

Qian¹,

Carrillo²,

Sun³

et al. 2022

Chinese Phys. B

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Using a single-mode approximation, we carry out the entanglement measures, e.g., the negativity and von Neumann entropy when a tetrapartite generalized GHZ state is treated in a noninertial frame, but only uniform acceleration is considered for simplicity. In terms of explicit negativity calculated, we notice that the difference between the algebraic average π 4 and geometric average Π 4 is very small with the increasing accelerated observers and they are totally equal when all four qubits are accelerated simultaneously. The entanglement properties are discussed from one accelerated observer to all four accelerated observers. It is shown that the entanglement still exists even if the acceleration parameter r goes to infinity. It is interesting to discover that all 1-1 tangles are equal to zero, but 1-3 and 2-2 tangles always decrease when the acceleration parameter r increases. We also study the von Neumann entropy and find that it increases with the number of the accelerated observers. In addition, we find that the von Neumann entropy S ABCDI, S ABCIDI, S ABICIDI and S AIBICIDI always decrease with the controllable angle θ, while the entropies S 3 – 3 non, S 3 – 2 non, S 3 – 1 non and S 3 – 0 non first increase with the angle θ and then decrease with it.

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Gaussian quantum discord and the monogamy relation in de Sitter space

Zeng

Liu

2022

Quantum Inf Process

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Quantum discord of the Werner state in noninertial frames

Cited by 7 publications

References 53 publications

Entanglement dynamics of a dc SQUID interacting with a single-mode radiation field

Entanglement dynamics of a dc SQUID interacting with a single-mode radiation field

Tetrapartite entanglement measures of generalized GHZ state in the noninertial frames

Gaussian quantum discord and the monogamy relation in de Sitter space

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