Consideration of Fidelity for Dynamic of W State in Several Channels With Noise

In quantum information theory, fidelity is a measure of the closeness of the two quantum states. In this work we consider the fidelity for W state in several noisy channels and calculate this parameter for these noisy channels. We showed that the fidelity is approximately equivalent in Pauli channel...

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Bibliographic Details
Published in:International journal of theoretical physics 2019-11, Vol.58 (11), p.3952-3960
Main Author: Khansari, S. M. Moosavi
Format: Article
Language:English
Subjects:
Accuracy
Channels
Depolarization
Elementary Particles
Information theory
Mathematical and Computational Physics
Physics
Physics and Astronomy
Quantum Field Theory
Quantum phenomena
Quantum Physics
Theoretical
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Summary:In quantum information theory, fidelity is a measure of the closeness of the two quantum states. In this work we consider the fidelity for W state in several noisy channels and calculate this parameter for these noisy channels. We showed that the fidelity is approximately equivalent in Pauli channels σ z , σ x ( σ y ) and fidelity for Pauli channels σ x and Pauli channels σ y , are the same. But in depolarizing channel, the fidelity decreases faster than those three channels (Pauli channels σ x , σ y , σ z ). Also, if the system does not interact with the environment, the fidelity stays fixed and at all times is equal to o n e (1). If the interaction between the system and the environment is strong, all the diagrams of fidelity slow down quickly with increasing time.
ISSN:0020-7748
1572-9575
DOI:10.1007/s10773-019-04264-8