Preservation of a lower bound of quantum secret key rate in the presence of decoherence

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• 作者：Shounak Datta ; ^{shounak.datta@bose.res.in} ; Suchetana Goswami ^{suchetana.goswami@bose.res.in} ; Tanumoy Pramanik ^{tanu.pram99@bose.res.in} ; A.S. Majumdar ^{archan@bose.res.in}
• 关键词：Quantum key distribution ; Quantum steering ; Weak measurement ; Non-locality ; Quantum decoherence
• 刊名：Physics Letters A
• 出版年：2017
• 出版时间：11 March 2017
• 年：2017
• 卷：381
• 期：10
• 页码：897-902
• 全文大小：1161 K
• 卷排序：381

文摘

In general, decoherence has negative effect on the steerability and quantum secret key rate of a bipartite state. Quantum key rate can be preserved against the effect of decoherence using the technique of weak measurement. The technique of weak measurements includes a weak measurement and its reversal. For some strength of weak measurement and environmental interaction, the average secret key rate is improved.