Analytical method of multiqubit entanglement robustness in correlated quantum channels

Peng, Zhen-Yu; Wu, Feng-Lin; Li, Jun; Xue, Hao-Nan; Liu, Siyuan; Wang, Zhan-Yun

doi:10.1103/physreva.107.022405

Cited by 4 publications

(2 citation statements)

References 26 publications

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“…It was proved that Pauli channels with arbitrary degree of memory can saturate a general upper bound on the maximal mutual information of quantum channels [57]. The channel with memory was reported to have better channel capacity and nonlocal advantage due to the introduction of memory [58][59][60][61][62][63][64][65]. Quantum correlations such as concurrence, discord and coherence could also be enhanced by memory [66][67][68].…”

Section: Introductionmentioning

confidence: 99%

Correlated noise enhances performance of joint remote state preparation in quantum multi-hop network

Zhang,

Shen

et al. 2024

Phys. Scr.

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Joint remote state preparation （JRSP for short）can increase the security of quantum communication by distributing different parts of classical information to different senders. However, the communication efﬁciency in terms of ﬁdelity decreases with the increase of intermediate nodes in multi-hop network. In this paper, we try to explore methods to improve ﬁdelity of JRSP in multi-hop network presented by Zhang and Chen in 2023 Phys. Scr. 98 065107. Speciﬁcally, correlated Pauli noise with partial memory was introduced into the the shared channel. We ﬁnd that the ﬁdelity increases with the increase of memory parameters, which compensates for the loss of ﬁdelity caused by the increase of network nodes.

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Section: Introductionmentioning

confidence: 99%

Correlated noise enhances performance of joint remote state preparation in quantum multi-hop network

Zhang,

Shen

et al. 2024

Phys. Scr.

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“…Due to the fragile property of entanglement to the surrounding environment, many endeavors have been devoted to pursue a robust entangled state [6][7][8][9][10]. Meanwhile, the factor influencing the entanglement robustness also becomes an important issue [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Characterizing entanglement robustness of N-qubit W superposition state against particle loss from quantum Fisher information

Ren

2023

Preprint

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We investigate the entanglement robustness of N-qubit W superposition state against particle loss with quantum Fisher information. In the noninteracting environment, the quantum Fisher information of reduced W superposition state is found same as the W superposition state when the number of qubits larger than 5, which shows very strong entanglement robustness compared to Twin-Fock state and Greenberger-Horne-Zeilinger state. Meanwhile, the effect of re-particle-loss is also studied and it presents a rapid decay of quantum Fisher information with the increase of losing qubits, indicating the weak entanglement robustness. In the interacting environment, the results show that the reduced W superposition state performs better than it in noninteracting environment. Alternatively, with the increase of qubits (N > 5) the reduced W superposition state behaves much more robust than original state. To vividly approach the real noisy environment, the effects of different decoherence channels are also considered.

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Exploring Two‐Exciton Steerability and Nonlocality Dynamics in Two Open Microcavities Coupled by an Optical Fiber

Aldosari,

Hashem

2024

Annalen der Physik

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This work will explore the generations of quantum nonlocalities (as entanglement, Bellnonlocality, and steerability) for two quantum wells (excitons) in dissipative microcavities containing a linear optical medium. An optical fiber links the microcavities. The generated two‐exciton nonlocalities are explored by using Bell inequality, steering inequality, and entanglement of formation. For initial correlated and uncorrelated states, the ability of the excitation–photon–fiber interactions to produce new generation and robustness of the two‐exciton nonlocality is investigated under the effects of the couplings of the exciton–photon and fiber–photon interactions as well as of the dissipations and the optical susceptibility. It is found that increasing the optical susceptibility enhances the regularity and amplitudes, reduces the frequencies of two‐exciton nonlocality dynamics, and supports dissipation degradations. For the initial uncorrelated state, decreasing the difference between the exciton–photon and fiber–photon couplings enhances the generations of the nonlocalities. For the initial correlated state, increasing the exciton–photon and fiber–photon couplings enhances the nonlocality conservation. For open microcavites, increasing the exciton–photon and fiber–photon couplings and the difference between them supports the nonlocality degradations resulting from the external environment dissipations.

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Analytical method of multiqubit entanglement robustness in correlated quantum channels

Cited by 4 publications

References 26 publications

Correlated noise enhances performance of joint remote state preparation in quantum multi-hop network

Correlated noise enhances performance of joint remote state preparation in quantum multi-hop network

Characterizing entanglement robustness of N-qubit W superposition state against particle loss from quantum Fisher information

Exploring Two‐Exciton Steerability and Nonlocality Dynamics in Two Open Microcavities Coupled by an Optical Fiber

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