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Inline detection and reconstruction of multiphoton quantum states
Optica ( IF 10.4 ) Pub Date : 2019-01-07 , DOI: 10.1364/optica.6.000041 Kai Wang , Sergey V. Suchkov , James G. Titchener , Alexander Szameit , Andrey A. Sukhorukov
Optica ( IF 10.4 ) Pub Date : 2019-01-07 , DOI: 10.1364/optica.6.000041 Kai Wang , Sergey V. Suchkov , James G. Titchener , Alexander Szameit , Andrey A. Sukhorukov
Integrated single-photon detectors open new possibilities for monitoring inside quantum photonic circuits. We present a concept for the inline measurement of spatially encoded multiphoton quantum states, while keeping the transmitted ones undisturbed. We theoretically establish that by recording photon correlations from optimally positioned detectors on top of coupled waveguides with detuned propagation constants, one can perform robust reconstruction of the -photon density matrix describing amplitude, phase, coherence, and quantum entanglement. We report proof-of-principle experiments using classical light, which emulates the single-photon regime. Our method opens a pathway towards practical and fast inline quantum measurements for diverse applications in quantum photonics.
中文翻译:
在线检测和重建多光子量子态
集成的单光子探测器为监视量子光子电路内部开辟了新的可能性。我们提出一种用于空间编码的多光子量子态的在线测量的概念,同时保持传输的信号不受干扰。我们从理论上确定,通过以失谐的传播常数记录来自耦合波导顶部最优位置的探测器的光子相关性,可以对光子进行鲁棒的重建。-光子密度矩阵,描述了振幅,相位,相干性和量子纠缠。我们报道了使用经典光的原理验证实验,它模拟了单光子状态。我们的方法为在量子光子学中的各种应用打开了实用,快速的在线量子测量的途径。
更新日期:2019-01-22
中文翻译:
在线检测和重建多光子量子态
集成的单光子探测器为监视量子光子电路内部开辟了新的可能性。我们提出一种用于空间编码的多光子量子态的在线测量的概念,同时保持传输的信号不受干扰。我们从理论上确定,通过以失谐的传播常数记录来自耦合波导顶部最优位置的探测器的光子相关性,可以对光子进行鲁棒的重建。-光子密度矩阵,描述了振幅,相位,相干性和量子纠缠。我们报道了使用经典光的原理验证实验,它模拟了单光子状态。我们的方法为在量子光子学中的各种应用打开了实用,快速的在线量子测量的途径。