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arXiv 0908.2482quant-ph
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基于数分辨光电探测的通用双量子比特光子门

Generic Two-Qubit Photonic Gates Implemented by Number-Resolving Photodetection

Dmitry B. Uskov, A. Matthew Smith, Lev Kaplan

摘要:

我们结合数值优化技术[Uskov等人,Phys.Rev.A79,042326(2009)],以获得通用线性光学KLM型双量子比特纠缠门的最佳实现。我们发现,虽然任何两个量子比特控制的U门,包括CNOT和CS,都可以只使用两个辅助资源来实现,成功概率S > 0.05,但一般的SU(4)操作需要三个未纠缠的辅助光子,成功概率S > 0.0063。具体来说,我们获得了接近0.0072的B门的最大成功概率。我们表明,一个通用的SU(4)门的单发实现提供了一个以上的数量级的成功概率和开销辅助资源减少两倍的数量级的增加相比,标准的三重CNOT和双B门分解。

英文摘要:

We combine numerical optimization techniques [Uskov et al., Phys. Rev. A 79, 042326 (2009)] with symmetries of the Weyl chamber to obtain optimal implementations of generic linear-optical KLM-type two-qubit entangling gates. We find that while any two-qubit controlled-U gate, including CNOT and CS, can be implemented using only two ancilla resources with success probability S > 0.05, a generic SU(4) operation requires three unentangled ancilla photons, with success S > 0.0063. Specifically, we obtain a maximal success probability close to 0.0072 for the B gate. We show that single-shot implementation of a generic SU(4) gate offers more than an order of magnitude increase in the success probability and two-fold reduction in overhead ancilla resources compared to standard triple-CNOT and double-B gate decompositions.

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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