In this study, we have achieved the world's first general-purpose optical quantum computing platform capable of performing calculations using highly non-classical optical pulses. Optical quantum computing platforms utilizing continuous variables of light have recently shown remarkable progress, emerging as a promising approach to quantum computing. However, all platforms developed thus far have been incomplete, as they are limited to performing only "linear operations." It is well known that these operations alone cannot achieve computational speeds surpassing those of today's computers. Our research group has successfully introduced highly non-classical optical pulses, an essential resource enabling "non-linear operations," into an optical quantum computing platform for the first time. This platform serves as a testbed for previously unattainable processing, such as the implementation of non-linear operations, evaluation of quantum error correction processes, and exploration of quantum applications in optimization and machine learning. Furthermore, the optical circuit architecture adopted in this platform features a unique and highly scalable design. By scaling up this platform so that it can deal with numerous optical pulses, our work would lead to the realization of fault-tolerant, universal quantum computers that surpass today’s supercomputers.
Papers
Journal: PRX Quantum
Title: Sequential and Programmable Squeezing Gates for Optical Non-Gaussian Input States
Authors: Takato Yoshida, Daichi Okuno, Takahiro Kashiwazaki, Takeshi Umeki, Shigehito Miki, Fumihiro China, Masahiro Yabuno, Hirotaka Terai, and Shuntaro Takeda*
High-speed generation of optical quantum state: Acceleration of optical quantum computers via optical communication technology
