Coherent Ultrafast Measurement of Time-Bin Encoded Photons
Coherent Ultrafast Measurement of Time-Bin Encoded Photons
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DOI：
10.1103/physrevlett.111.153602
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发表时间：
2013-10-09
影响因子：
8.6
通讯作者：
Resch, Kevin J.
中科院分区：
文献类型：
--
作者：
Donohue, John M.;Agnew, Megan;Resch, Kevin J.
时间仓编码是光量子信息的鲁棒形式，特别是对于光纤中的传输。为了读出信息，时间仓的间隔必须大于探测器的时间分辨率，对于光子计数器通常在纳秒的量级。在目前的工作中，我们展示了一种技术，使用啁啾纠缠的时间仓光子和成形的激光脉冲之间的非线性相互作用进行投影测量的任意时间仓状态与皮秒尺度的分离。我们展示了一组完整的时间仓量子位投影测量的断层摄影，并显示操作的保真度足够高，违反Clauser-Horne-Shimony-Holt-Bell不等式超过6个标准差。
Time-bin encoding is a robust form of optical quantum information, especially for transmission in optical fibers. To readout the information, the separation of the time bins must be larger than the detector time resolution, typically on the order of nanoseconds for photon counters. In the present work, we demonstrate a technique using a nonlinear interaction between chirped entangled time-bin photons and shaped laser pulses to perform projective measurements on arbitrary time-bin states with picosecond-scale separations. We demonstrate a tomographically complete set of time-bin qubit projective measurements and show the fidelity of operations is sufficiently high to violate the Clauser-Horne-Shimony-Holt-Bell inequality by more than 6 standard deviations.