Teleportation via an Entangled Coherent Channel and Decoherence Effect on This Channel

Journal of Optoelectronical Nanostructures

مقاله 1، دوره 4، شماره 4 - شماره پیاپی 15، اسفند 2019، صفحه 1-14   

نوع مقاله: Articles

نویسندگان

Ardalan Fatahizadeh^{* 1}؛ Ardeshir Rabeie²

¹Physics Department, Faculty of Science, Razi University, Kermanshah

²Department of Physics, Razi university, Iran

تاریخ دریافت: 10 تیر 1398،  تاریخ بازنگری: 24 شهریور 1398،  تاریخ پذیرش: 10 مهر 1398 

چکیده

We study an entangled two-mode coherent state within the framework of
2×2-dimensional Hilbert space. We investigate the problem of quantum teleportation of
a superposition coherent state via an entangled coherent channel. By three different
measures with the titles ``minimum assured fidelity (MASF)”, ``average teleportation
fidelity” and ``optimal fidelity (f)” we study the quality of this kind of teleportation.
Decoherence properties of the entangled coherent state due to channel losses are
analysed. For a symmetric noise channel, the degradation of optimal fidelity and degree
of entanglement are calculated. Also by two different measures with the titles
``concurrence” and ``entanglement of formation” we study the amount of entanglement
of a decohered quantum channel and discuss its details. We demonstrate that
entanglement of the decohered entangled coherent state is reduced but not throughly
lost. Finally we find that the optimal fidelity of the decohered entangled coherent state is
more than the classical limit and the decohered entangled coherent state may be useful
for quantum teleportation.

کلیدواژه‌ها

Coherent states؛ Teleportation؛ Fidelity؛ Concurrence

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