Properties on the distant distribution of entanglement for arbitrary two-qubit pure states via noisy quantum channels
Wang Qiong(王琼), Li Ji-Xin(李际新), and Zeng Hao-Sheng(曾浩生)†
Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education,and Department of Physics, Hunan Normal University, Changsha 410081, China
Abstract This paper investigates the change of entanglement for transmitting an arbitrarily entangled two-qubit pure state via one of three typical kinds of noisy quantum channels: amplitude damping quantum channel, phase damping quantum channel and depolarizing quantum channel. It finds, in all these three cases, that the output distant entanglement (measured by concurrence) reduces proportionately with respect to its initial amount, and the decaying ratio is determined only by the noisy characteristics of quantum channels and independent of the form of initial input state.
Received: 19 July 2008
Revised: 24 August 2008
Accepted manuscript online:
Fund: Project supported
by the National Natural Science Foundation of China (Grant No
10775048), the National Fundamental Research Program of China (Grant
No 2007CB925204), the Key Project of Chinese Ministry of Education
(Grant No 206103), and the Education De
Cite this article:
Wang Qiong(王琼), Li Ji-Xin(李际新), and Zeng Hao-Sheng(曾浩生) Properties on the distant distribution of entanglement for arbitrary two-qubit pure states via noisy quantum channels 2009 Chin. Phys. B 18 1357
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