Cavity-based architecture to preserve quantum coherence and entanglement

Man, Zhong‐Xiao; Xia, Yun‐Jie; Franco, Rosario Lo

doi:10.1038/srep13843

Cited by 167 publications

(117 citation statements)

References 99 publications

(194 reference statements)

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“…the initial coherency of the j th qubit). On the other hand, these observations are confirmed by the behavior of the related decay rate (18) in terms of the scaled parameter γ 0 t, as shown in Fig. 3.…”

Section: Quantum Coherence Preservationsupporting

confidence: 70%

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Quantum coherence and entanglement preservation in Markovian and non-Markovian dynamics via additional qubits

2017

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In this paper, we investigate preservation of quantum coherence of a single-qubit interacting with a zero-temperature thermal reservoir through the addition of noninteracting qubits in the reservoir. Moreover, we extend this scheme to preserve quantum entanglement between two and three distant qubits, each of which interacts with a dissipative reservoir independently. At the limit t → ∞, we obtained analytical expressions for the coherence measure and the concurrence of two and three qubits in terms of the number of additional qubits. It is observed that, by increasing the number of additional qubits in each reservoir, the initial coherence and the respective entanglements are completely protected in both Markovian and non-Markovian regimes. Interestingly, the protection of entanglements occurs even under the individually different behaviors of the reservoirs.

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Section: Quantum Coherence Preservationsupporting

confidence: 70%

“…Therefore, finding strategies to protect quantum resources, such as coherence and entanglement, is an essential task in these configurations [18].…”

Section: Introductionmentioning

confidence: 99%

Quantum coherence and entanglement preservation in Markovian and non-Markovian dynamics via additional qubits

2017

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“…Based on this idea, it has been suggested that non-Markovianity can be exploited to engineer quantum memories [32][33][34]. Indeed, NM is linked to a back flow of information from the environment into the system, as evidenced by the Breuer-Laine-Piilo (BLP) NM measure [1].…”

Section: Introductionmentioning

confidence: 99%

Non-Markovianity and memory of the initial state

Hinarejos

Bañuls

Perez

et al. 2017

J. Phys. A: Math. Theor.

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We explore in a rigorous manner the intuitive connection between the non-Markovianity of the evolution of an open quantum system and the performance of the system as a quantum memory. Using the paradigmatic case of a two-level open quantum system coupled to a bosonic bath, we compute the recovery fidelity, which measures the best possible performance of the system to store a qubit of information. We deduce that this quantity is connected, but not uniquely determined, by the non-Markovianity, for which we adopt the BLP measure proposed in [1]. We illustrate our findings with explicit calculations for the case of a structured environment.

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“…The generation and preservation of bipartite or multipartite quantum correlations have been widely studied both theoretically [7][8][9][10][11][12][13][14][15][16][17][18][19][20] and experimentally [21][22][23][24][25][26] in recent years. Usually, people use of methods to create entanglement either indirect coupled quantum systems or direct coupled quantum systems [27][28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Generation and protection of steady-state quantum correlations due to quantum channels with memory

Guo

Mao-Fa

Wang

et al. 2016

Quantum Inf Process

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We have proposed a scheme of the generation and preservation of two-qubit steady-state quantum correlations through quantum channels where successive uses of the channels are correlated. Different types of noisy channels with memory, such as amplitude damping, phase-damping, and depolarizing channels have been taken into account. Some analytical or numerical results are presented. The effect of channels with memory on dynamics of quantum correlations has been discussed in detail. The results show that, steady-state entanglement between two initial qubits without entanglement subject to amplitude damping channel with memory can be generated. The entanglement creation is related to the memory coefficient of channel µ. The stronger the memory coefficient of channel µ is, the more the entanglement creation is, and the earlier the separable state becomes the entangled state. The result also shows that there exists nonlocality in the absence of entanglement. Besides, we compare the dynamics of entanglement with that of quantum discord when a two-qubit system is initially prepared in an entangled state. We show that entanglement dynamics suddenly disappears, while quantum discord displays only in the asymptotic limit. Furthermore, two-qubit quantum correlations can be preserved at a long time in the limit of µ → 1.

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Cavity-based architecture to preserve quantum coherence and entanglement

Cited by 167 publications

References 99 publications

Quantum coherence and entanglement preservation in Markovian and non-Markovian dynamics via additional qubits

Quantum coherence and entanglement preservation in Markovian and non-Markovian dynamics via additional qubits

Non-Markovianity and memory of the initial state

Generation and protection of steady-state quantum correlations due to quantum channels with memory

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