Vacuum as a less hostile environment to entanglement

Marek, Petr; Lee, Jinhyoung; Kim, M. S.

doi:10.1103/physreva.77.032302

Cited by 23 publications

(16 citation statements)

References 39 publications

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“…Typically, entanglement sudden death occurs when the two qubits interact with two independent environments as for the case, e.g., of two entangled qubits placed inside two different cavities. For such a configuration, a class of states has been identified which do not experience a complete entanglement loss despite the interaction with local vacuum environments [4]. However, for finite temperature environments the sudden death occurs almost independently of the initial state of the qubit pair [5], although with details that can depend on the amount of non-Markovianity of the environments [6].…”

Section: Introductionmentioning

confidence: 99%

Off-resonant entanglement generation in a lossy cavity

et al. 2009

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We provide an exact and complete characterization of the entanglement dynamics of two qubits coupled to a common structured reservoir at zero temperature. We derive the conditions to maximize reservoir-induced entanglement for an initially factorized state of the two-qubit system. In particular, when the two qubits are placed inside a lossy cavity, we show that high values of entanglement can be obtained, even in the bad cavity limit, in the dispersive regime. Finally we show that, under certain conditions, the entanglement dynamics exhibits quantum beats and we explain their physical origin in terms of the interference between two different transitions coupling the dressed states of the system.Comment: 10 pages, 6 figure

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Section: Introductionmentioning

confidence: 99%

Off-resonant entanglement generation in a lossy cavity

et al. 2009

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“…Furthermore, it has also been observed in cavity QED and trapped ion systems [21]. On the other hand, the phenomenon ESD has provoked many theoretical investigations in other bipartite systems involving pairs of atomic, photonic, and spin qubits [22][23][24][25], multipartite systems [26] and spin chains [27][28][29]. In addition, ESD has also been explored for different environments [16,18,30,31].…”

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confidence: 99%

Entanglement dynamics of two-bipartite system under the influence of dissipative environments

Bougouffa

2010

Optics Communications

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An experimental scheme is suggested that permits a direct measure of entanglement of two-qubit cavity system. It is articulated on the cavity-QED technology utilizing atoms as flying qubits. With this scheme we generate two different measures of entanglement namely logarithmic negativity and concurrence. The phenomenon of sudden death entanglement (ESD) in a bipartite system subjected to dissipative environment will be examined.

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“…Furthermore, it has also been observed in cavity QED and trapped ion systems [41]. On the other hand, the phenomenon ESD has motivated many theoretical investigations in other bipartite systems involving pairs of atomic, photonic, and spin qubits [42,43,44,45], multipartite systems [46,47] and spin chains [48,49,50]. In addition, ESD has also been investigated for different environments [37,38,55,52,53].…”

Section: Introductionmentioning

confidence: 99%

Entanglement in two-mode continuous variable open quantum systems

Исар

2011

Phys. Scr.

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Abstract. Entanglement plays a crucial role in quantum information protocols, thus the dynamical behavior of entangled states is of a great importance. In this paper we suggest a useful scheme that permits a direct measure of entanglement in a two-qubit cavity system. It is realized in the cavity-QED technology utilizing atoms as flying qubits. To quantify entanglement we use the concurrence. We derive the conditions, which assure that the state remains entangled in spite of the interaction with the reservoir. The phenomenon of sudden death entanglement (ESD) in a bipartite system subjected to squeezed vacuum reservoir is examined. We show that the sudden death time of the entangled states depends on the initial preparation of the entangled state and the parameters of the squeezed vacuum reservoir.

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Vacuum as a less hostile environment to entanglement

Cited by 23 publications

References 39 publications

Off-resonant entanglement generation in a lossy cavity

Off-resonant entanglement generation in a lossy cavity

Entanglement dynamics of two-bipartite system under the influence of dissipative environments

Entanglement in two-mode continuous variable open quantum systems

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