Promote entanglement trapping in photonic band gaps

Wang, Han; Zhang, Ying-Jie; Yan, Wu; Xia, Yun‐Jie

doi:10.1088/1674-1056/23/11/110304

Cited by 2 publications

(1 citation statement)

References 29 publications

(31 reference statements)

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“…[25], [30], and [31]. For the case of two qubits, the weak measurement and quantum measurement reversal can remarkably increase the entanglement, and even avoid the sudden death of the entanglement, [25,32,33] where their method is to apply the weak measurement as a pre-measurement on each qubit before it undergoes decoherence. When the qubits interact with incoherent channels, the proper post-measurements are performed on both qubits.…”

Section: Coherence Versus Quantum Entanglementmentioning

confidence: 99%

Amplifying and freezing of quantum coherence using weak measurement and quantum measurement reversal

Yang

Xia

2016

Chinese Phys. B

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We analyze universal conditions where the l 1 norm and relative entropy of coherence are amplified and frozen under identical bit-flip channels; that is, using pre-measurements (quantum weak measurements or quantum measurement reversals) on the systems before undergoing local bit-flip channels. With the option of quantum weak measurements or quantum measurement reversals, the measurement strength and the success probability are all determined by the initial state of the quantum system.

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Section: Coherence Versus Quantum Entanglementmentioning

confidence: 99%

Amplifying and freezing of quantum coherence using weak measurement and quantum measurement reversal

Yang

Xia

2016

Chinese Phys. B

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Protecting quantum entanglement at finite temperature by the weak measurements

Wang¹,

Xia²

2015

Acta Phys. Sin.

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According to the map of a qubit, a scheme for protecting entanglement of two-qubit by the weak measurements at finite temperature is proposed. Since the choices of the channel parameters and initial states are very different for different weak measurement strengths, two local unitary equivalent initial entangled states |ψ> and |φ> are chosen. Weak measurements are performed when two initial entangled states go through the generalized amplitude damping channel, and the analytical expressions of getting maximum concurrence entanglement Cr and weak measurement parameters m and n can be obtained by performing an overall optimization for four weak measurement parameters. What is more, the relationship between the weak measurement parameters and the channel parameters is further explored. Theoretical results show the entanglement protection project based on weak measurements can effectively enhance the entanglement and even prevent the sudden death of entanglement in some cases. When the channel parameter r is fixed, for different values of parameter p, the concurrence is centered at p = 0.5, and the weak measurement parameters of the maximum concurrence entanglement are the same as those for initial state |ψ>, while they are different for initial state |φ>. Under the condition of different values of r, for the fixed p and initial state |ψ> or |φ>, the weak measurement parameters remain constant as the entanglement reaches the maximum and the concurrence decreases with the increase of parameter r. Through the analysis of channel parameters, higher entanglement can be obtained by choosing appropriate channel parameters and initial state.

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Promote entanglement trapping in photonic band gaps

Abstract: 韩伟) a) , Zhang Ying-Jie(张英杰) a)b) , Yan Wei-Bin(闫伟斌) b) , and Xia Yun-Jie(夏云杰) a) †

Cited by 2 publications

References 29 publications

Amplifying and freezing of quantum coherence using weak measurement and quantum measurement reversal

Amplifying and freezing of quantum coherence using weak measurement and quantum measurement reversal

Protecting quantum entanglement at finite temperature by the weak measurements

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Promote entanglement trapping in photonic band gaps

Abstract: 韩 伟) a) , Zhang Ying-Jie(张英杰) a)b) , Yan Wei-Bin(闫伟斌) b) , and Xia Yun-Jie(夏云杰) a) †

Cited by 2 publications

References 29 publications

Amplifying and freezing of quantum coherence using weak measurement and quantum measurement reversal

Amplifying and freezing of quantum coherence using weak measurement and quantum measurement reversal

Protecting quantum entanglement at finite temperature by the weak measurements

Contact Info

Product

Resources

About

Abstract: 韩伟) a) , Zhang Ying-Jie(张英杰) a)b) , Yan Wei-Bin(闫伟斌) b) , and Xia Yun-Jie(夏云杰) a) †