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arXiv quant-ph/0410170quant-ph
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关于非局部门产生的效率

On the efficiency of nonlocal gates generation

Berry Groisman, Benni Reznik

摘要:

提出并研究了一种利用非最大纠缠态实现概率非局域门的方法。与基于蒸馏的协议不同,这种方法不会在过程的中间阶段产生最大纠缠态。因此,该方法在一定的参数范围内变得更有效。具有$ξ\ll1$的形式$\exp[iξσ_{n_A}σ_{n_B}]$的门可以以几乎单位的概率和以消失的小纠缠来实现,而对于基于蒸馏的方法,以消失的成功概率来产生门。我们还得到了最佳成功概率的上限,并表明在小纠缠极限,该界是紧的。

英文摘要:

We propose and study a method for using non-maximally entangled states to implement probabilistically non-local gates. Unlike distillation-based protocols, this method does not generate a maximally entangled state at intermediate stages of the process. As a consequences, the method becomes more efficient at a certain range of parameters. Gates of the form $\exp[iξσ_{n_A}σ_{n_B}]$ with $ξ\ll1$, can be implemented with nearly unit probability and with vanishingly small entanglement, while for the distillation-based method the gate is produced with a vanishing success probability. We also derive an upper bound to the optimal success probability and show that in the small entanglement limit, the bound is tight.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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