利用SPDC和PBS实现受控非门的有效方案

An Effective Scheme of Realizing CONT Gate Using SPDC and PBS

任意一个N量子比特逻辑运算可以由一系列单量子比特门和受控非门实现[1]。因此,这两种量子逻辑门的实现是研究量子计算自然的目标。虽然单量子比特门易于实现,但是由于光子间的相互作用比较弱,所以很难实现受控非门的操作。本文基于T.B.Pittman[2]与A.L.Migdall[3]等人的工作,提出了利用自发参量下转换(SPDC)过程采用多点延时探测触发的方法获得高效单光子源,提高实现受控非门效率的理论方案。

Any N-qubit logic gate may be composed of CNOT and single implement CNOT and single qubit gate for quantum computation. However, it gate . So we need to has been very difficult to achieve the necessary CNOT gate since the physical interaction among photons is excessively weak. Based on the works of T. B. Pittman and A. L. Migdall , we show a theoretical scheme for enhancing the efficiency of CNOT gate using high efficiency single photon produced by multi-dots delay detection via SPDC.