Preserving entanglement and the fidelity of three-qubit quantum states undergoing decoherence using weak measurement

Liao, Xiang-Ping; Mao-Fa, Fang; Fang, Jianshu; Zhu, Qibing

doi:10.1088/1674-1056/23/2/020304

Cited by 39 publications

(16 citation statements)

References 48 publications

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“…得到了相同的结论。与此相关的工作 [19][20][21] 也相继得到了研究。近期，簇态因其诸多优越的性质而在量子信息领域受到普遍重视。Raussendorf 等 [22][23][24][25] 在研究量子计算…”

Section: -unclassified

Protecting Entanglement and Fidelity of Cluster States by Weak Measurement and Reversal

Jiang¹,

Qin²

2016

激光与光电子学进展

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The protection of entanglement and fidelity of cluster states under amplitude damping decoherence by means of weak measurement is investigated. Employing the prior weak measurement and post weak measurement reversal, the decoherence of system can be prohibited effectively, and the fidelity is improved obviously. Besides, the evolution of entanglement and fidelity are dependent on the weak measurement strength P. By choosing some proper values of P, the entanglement and fidelity can be protected optimally.

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Section: -unclassified

Protecting Entanglement and Fidelity of Cluster States by Weak Measurement and Reversal

Jiang¹,

Qin²

2016

激光与光电子学进展

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“…[36][37][38] The weak measurement can also protect entanglement from decoherence. [39][40][41] The feedback control can not only minimize the loss of entanglement between the two qubits but also create and stabilize the highly entangled states. [42][43][44] Besides these, the dipole-dipole interaction between atoms can also protect the entanglement from sudden death.…”

Section: Introductionmentioning

confidence: 99%

Entanglement Dynamics of Two V‐type Atoms with Dipole–Dipole Interaction in Dissipative Cavity

et al. 2023

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In this work, a coupled system of two V-type atoms with dipole-dipole interaction in a dissipative single-mode cavity, which couples with an external environment, is studied. The analytical solution of this model is obtained by solving the time dependent Schrodinger equation after Hamiltonian of dissipative cavity is diagonalized by introducing a set of new creation and annihilation operators according to Fano theorem. It is also discussed in detail how the entanglement dynamics of different initial states are influenced by the cavity-environment coupling, the spontaneously generated interference (SGI) parameter, and the dipole-dipole interaction between two atoms . The results show that the SGI parameter has different effects on entanglement dynamics under different initial states. Namely, the SGI parameter will increase the decay rate of the initially maximal entangled state and reduce that of the initially partial entangled state. For the initially product state, the larger SGI parameter corresponds to the more entanglement generated. The entanglement monotonically decreases under the weak cavity-environment coupling, while the oscillation of entanglement will occur under the strong cavity-environment coupling. The larger the dipole-dipole interaction is, the slower the entanglement decays and the more the entanglement will be generated. So the dipole-dipole interaction can not only protect and generate entanglement very effectively, but also enhance the regulation effect of the SGI parameter on entanglement.

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“…Since the seminal work by Aharonov, Albert, and Vaidman [13], weak measurement and reversal measurement have been studied in theory [14,15] and realized in experiment [16]. For example, Liao [17] preserved entanglement and the fidelity of three-qubit quantum states by using quantum reversal operation. Environment-assisted quantum state restoration via weak measurements was argued about by Wang [18].…”

Section: Introductionmentioning

confidence: 99%

Improving the capacity of quantum dense coding by weak measurement and reversal measurement

Tian

Zhang

2017

Quantum Inf Process

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A protocol of quantum dense coding protection of two qubits is proposed in amplitude damping (AD) channel using weak measurement and reversal measurement. It is found that the capacity of quantum dense coding under the weak measurement and reversal measurement is always greater than that without weak measurement and reversal measurement. When the protocol is applied, for the AD channels with different damping coefficient, the result reflects that quantum entanglement can be protected and quantum dense coding becomes successful.In recent years, with the development of quantum mechanics and the establishment of quantum information science, quantum entanglement becomes a new research hotspot of theoretical physics. Quantum entanglement, which is a key part of quantum information processing[1], including quantum teleportation[2-3], quantum computing[4], quantum cryptography[5], quantum dense coding[6] and quantum secret sharing [7]. However, in realistic quantum information processing, entanglement is inevitably affected by the interaction between the system and environment, which leads to degradation. Furthermore, entanglement sudden death (ESD) [8][9][10][11] will appear in this case. Thus, it is very important to protect entanglement in quantum information processing.

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Preserving entanglement and the fidelity of three-qubit quantum states undergoing decoherence using weak measurement

Abstract: Preserving entanglement and the fidelity of three-qubit quantum states undergoing decoherence using weak measurement * Liao Xiang-Ping(廖湘萍) a) † , Fang Mao-Fa(方卯发) b) , Fang Jian-Shu(方见树) a) ‡ , and Zhu Qian-Quan(朱钱泉) a) a

Cited by 39 publications

References 48 publications

Protecting Entanglement and Fidelity of Cluster States by Weak Measurement and Reversal

Protecting Entanglement and Fidelity of Cluster States by Weak Measurement and Reversal

Entanglement Dynamics of Two V‐type Atoms with Dipole–Dipole Interaction in Dissipative Cavity

Improving the capacity of quantum dense coding by weak measurement and reversal measurement

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