Weak Measurement-Based Entanglement Protection of Two-Qubit X-States from Amplitude Damping Decoherence

Considering X-states the density matrixes of which look like the letter X, we propose a weak measurement-based entanglement protection protocol of two-qubit X-states under local amplitude damping channels using weak measurement and reversal operation. It is shown that, with increase of the decoheren...

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Bibliographic Details
Published inInternational journal of theoretical physics Vol. 56; no. 5; pp. 1504 - 1516
Main Authors Hu, Yao-Hua, Tao, Ya-Ping, Tan, Yong-Gang, Yang, Hai-Feng
Format Journal Article
LanguageEnglish
Published New York Springer US 01.05.2017
Springer Nature B.V
Subjects
Damping
Electrostatic discharges
Elementary Particles
Mathematical and Computational Physics
Physics
Physics and Astronomy
Quantum entanglement
Quantum Field Theory
Quantum Physics
Theoretical
X-states
Weak measurement
Amplitude damping
Entanglement protection
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Summary:Considering X-states the density matrixes of which look like the letter X, we propose a weak measurement-based entanglement protection protocol of two-qubit X-states under local amplitude damping channels using weak measurement and reversal operation. It is shown that, with increase of the decoherence parameter, the entanglement attenuates rapidly owing to the amplitude damping noise and even experiences entanglement sudden death (ESD). However, the entanglement under the weak measurement and reversal operation is always much stronger than the entanglement undergoing the amplitude damping decoherence. These results reflect that entanglement of two-qubit X-states from amplitude damping decoherence can be protected, and ESD can be circumvented by increasing the weak measurement strength.
ISSN:0020-7748
1572-9575
DOI:10.1007/s10773-017-3290-1