We exploit quantum information processing on a traveling wave of light, expecting emancipation from thermal noise, easy coupling to fiber communication, and potentially high operation speed. Although optical memories are technically challenging, we have an alternative approach to apply multi-step operations on traveling light, that is, continuous-variable one-way computation. So far our achievement includes generation of a one-million-mode entangled chain in time-domain, mode engineering of nonlinear resource states, and real-time nonlinear feedforward. Although they are implemented with free space optics, we are also investigating photonic integration and performed quantum teleportation with a passive liner waveguide chip as a demonstration of entangling, measurement, and feedforward. We also suggest a loop-based architecture as another model of continuous-variable computing.
Takahiro Serikawa, Yu Shiozawa, Hisashi Ogawa, Naoto Takanashi, Shuntaro Takeda, Jun-ichi Yoshikawa, and Akira Furusawa, "Quantum information processing with a travelling wave of light," Proc. SPIE 10535, Integrated Optics: Devices, Materials, and Technologies XXII, 105351B (Presented at SPIE OPTO: January 31, 2018; Published: 23 February 2018); https://doi.org/10.1117/12.2289039.
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