Okamoto Fumiya, Endo Mamoru, Matsuyama Mikihisa, Ishizuka Yuya, Liu Yang, Sakakibara Rei, Hashimoto Yosuke, Yoshikawa Jun-Ichi, van Loock Peter, Furusawa Akira
Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
State Key Laboratory of Quantum Optics and Quantum Optics Devices, Collaborative Innovation Center of Extreme Optics, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China.
Phys Rev Lett. 2020 Dec 31;125(26):260508. doi: 10.1103/PhysRevLett.125.260508.
Optical approaches to quantum computation require the creation of multimode photonic quantum states in a controlled fashion. Here we experimentally demonstrate phase locking of two all-optical quantum memories, based on a concatenated cavity system with phase reference beams, for the time-controlled release of two-mode entangled single-photon states. The release time for each mode can be independently determined. The generated states are characterized by two-mode optical homodyne tomography. Entanglement and nonclassicality are preserved for release-time differences up to 400 ns, confirmed by logarithmic negativities and Wigner-function negativities, respectively.
量子计算的光学方法需要以可控方式创建多模光子量子态。在此，我们基于带有相位参考光束的级联腔系统，通过实验证明了两个全光量子存储器的锁相，用于双模纠缠单光子态的时间控制释放。每个模式的释放时间可以独立确定。所产生的态通过双模光学零差层析成像进行表征。通过对数负性和维格纳函数负性分别证实，对于高达400纳秒的释放时间差，纠缠和非经典性得以保留。
