Decoherence of quantum information in the non-Markovian qubit channel
Decoherence of quantum information in the non-Markovian qubit channel
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DOI：
10.1088/0305-4470/38/32/006
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发表时间：
2005-07
期刊：
影响因子：
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通讯作者：
M. Ban;S. Kitajima;F. Shibata
中科院分区：
文献类型：
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作者：
M. Ban;S. Kitajima;F. Shibata
研究了在非马尔可夫量子信道的影响下，量子比特的量子信息的退相干，其中库变量的相关时间取有限值。评估了量子比特态的纯度、可纠缠性和纠缠度的退化。研究发现，非马尔可夫效应使量子信息的相干时间比马尔可夫量子信道的相干时间长。在此基础上，研究了非马尔可夫信道影响下的量子比特的量子隐形传态和量子密集编码问题。得到了传输态与原态之间的保真度和Holevo容量。
Decoherence of quantum information of qubits is investigated under the influence of the non-Markovian quantum channel, where the correlation time of reservoir variables takes a finite value. Degradation of purity, distinguishability and entanglement of qubit states are evaluated. It is found that the non-Markov effect makes the coherence time of quantum information longer than that obtained for the Markovian quantum channel. Furthermore, the quantum teleportation and quantum dense coding of qubits are considered under the influence of non-Markov channels. The fidelity between teleported and original states and the Holevo capacity are obtained.