论文标题
时间分辨的光电检测和玻色子抽样的区分性理论
Distinguishability theory for time-resolved photodetection and boson sampling
论文作者
论文摘要
我们研究了使用能够精确的时间分辨率的快速检测器，在多个多群中的多光子干扰中的分辨率。先前建议使用这种设置来实现单个光子的玻色子采样。我们研究了快速光电检测是否允许在混合状态下估算逼真的单个光子的区分性。为此，我们比较了两个设置中光子的区分性：（a）在空间干涉仪上具有相同平均（时间）曲线的光子在相同的（或具有强烈不正确）时间分辨率和（b）与相同的空间干涉仪和光照射时相同的平均时间分配中的光子和（b）与光子的平均时间分辨率和（b）相同的光子进行分辨率。获得高斯形单光子的精确分析结果，具有光子到达时间的高斯分布。发现两个设置中光子的区分性非常相似。对于相同的光子状态，只能使用两个设置中的任何一个才能实现相同质量的实验玻色子采样。我们结果的结果是，由于光电检测方案如何，由于混合状态引起的分辨率是光子的内在特性。
We study distinguishability of photons in multiphoton interference on a multiport when fast detectors, capable of precise time resolution, are employed. Such a setup was previously suggested for experimental realization of boson sampling with single photons. We investigate if fast photodetection allows to circumvent distinguishability of realistic single photons in mixed states. To this goal we compare distinguishability of photons in two setups: (a) with photons in the same average (temporal) profile on a spatial interferometer and photodetection incapable of (or with strongly imprecise) time resolution and (b) with photons in generally different average temporal profiles on the same spatial interferometer and photodetection with precise time resolution. Exact analytical results are obtained for Gaussian-shaped single photons with Gaussian distribution of photon arrival time. Distinguishability of photons in the two setups is found to be strikingly similar. For the same purity of photon states, only the same quality experimental boson sampling can be achieved using either of the two setups. The upshot of our results is that distinguishability due to mixed states is an intrinsic property of photons, whatever the photodetection scheme.
