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Energy-time entangled biphoton source plays a great role in quantumcommunication, quantum metrology and quantum cryptography due to its strongtemporal correlation and capability of nonlocal dispersion cancellation. As aquantum effect, nonlocal dispersion cancellation is further proposed as analternative way for nonlocality test of continuous variable entanglement viathe violation of Bell-like inequality proposed by Wasak et al. [Phys. Rev. A,82, 052120 (2010)]. However, to date there is no experimental report either onthe inequality violation or on a nonlocal detection with single-photondetectors at long-distance transmission channel, which is key for a truenonlocality test. In this paper, we report an experimental realization of aviolation of the inequality after 62km optical fiber transmission at telecomwavelength with a nonlocal detection based on event timers andcross-correlation algorithm, which indicates a successful nonlocal test ofenergy-time entanglement. This work provides a new feasibility for the stricttest of the nonlocality for continuous variables in both long-distancecommunication fiber channel and free space.

Nonlocality test of energy-time entanglement via nonlocal dispersion cancellation with nonlocal detection