Synchronization of optical photons for quantum information processing.
Synchronization of optical photons for quantum information processing.
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DOI：
10.1126/sciadv.1501772
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发表时间：
2016-05
期刊：
影响因子：
13.6
通讯作者：
Furusawa A
中科院分区：
文献类型：
--
作者：
Makino K;Hashimoto Y;Yoshikawa J;Ohdan H;Toyama T;van Loock P;Furusawa A
我们利用零差层析术观察了从两个量子存储器中提取的两个光子的Hong-Ou-Mandel干涉。利用光子量子比特进行量子信息处理的一个基本要素是当两个光子通过HOM效应聚束在一起时它们之间的非经典量子干涉。最终，许多这样的光子必须在复杂的干涉测量网络中进行处理。为此，必须同步飞行光子的到达时间并保持其高纯度。在最近高纯度单光子存储实验成功的基础上，我们首次证明了通过两个独立的量子存储器同步的两个预告的、几乎纯的光子的HOM干涉。控制存储时间高达1.8 μs，每秒约90个事件，实现了纯度足够高的负维格纳函数证实与零差测量。
We observe the Hong-Ou-Mandel interference via homodyne tomography on two photons extracted from two quantum memories. A fundamental element of quantum information processing with photonic qubits is the nonclassical quantum interference between two photons when they bunch together via the Hong-Ou-Mandel (HOM) effect. Ultimately, many such photons must be processed in complex interferometric networks. For this purpose, it is essential to synchronize the arrival times of the flying photons and to keep their purities high. On the basis of the recent experimental success of single-photon storage with high purity, we demonstrate for the first time the HOM interference of two heralded, nearly pure optical photons synchronized through two independent quantum memories. Controlled storage times of up to 1.8 μs for about 90 events per second were achieved with purities that were sufficiently high for a negative Wigner function confirmed with homodyne measurements.