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arXiv 1503.06187quant-ph
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一种可编程相移的线性光控相位门方案

Scheme for a linear-optical controlled-phase gate with programmable phase shift

Karel Lemr, Karol Bartkiewicz, Antonín Černoch

摘要:

我们提出了一种线性光学方案,用于控制相位门,具有由量子位态编程的可调相移。与所有先前的可调谐受控相位门相比,相移不是硬编码到光学设置中,而是可以通过所谓的程序量子位的状态调谐到从0到pi的任何值。我们的设置是可行的,目前的技术水平,只使用线性光学元件。我们提供了一个实验的可行性研究,以评估门的可实施性。我们还讨论了增加的成功概率高达1/12,接近一个最佳的非可编程可调控制相位门的成功概率的选项。

英文摘要:

We present a linear-optical scheme for a controlled-phase gate with tunable phase shift programmed by a qubit state. In contrast to all previous tunable controlled-phase gates, the phase shift is not hard-coded into the optical setup, but can be tuned to any value from 0 to pi by the state of a so-called program qubit. Our setup is feasible with current level of technology using only linear-optical components. We provide an experimental feasibility study to assess the gate's implementability. We also discuss options for increasing the success probability up to 1/12 which approaches the success probability of a optimal non-programmable tunable controlled-phase gate.

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