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Center for Nonlinear Studies |
Quantum computers, skillfully utilizing the unique properties of quantum mechanics, are attracting attention for their potential to surpass the capabilities of classical computers. Various physical systems have been proposed and researched as platforms for quantum computers. Among them, continuous-variable quantum information processing using light offers the potential to achieve THz-order clock frequencies by encoding quantum information in the quadrature-phase amplitudes of propagating light waves. This approach also enables large-scale and scalable quantum computing through temporal multiplexing of optical wave packets with quantum teleportation. Another significant advantage is the ability to fully leverage the benefits of ultra-high-speed optical communication technologies, with GHz-order clock frequencies already achievable as of 2024. However, due to the weak interaction between light and matter, challenges remain in universal computation and error correction, posing a bottleneck for realizing fault-tolerant optical quantum computers. Although it is theoretically known that incorporating non-Gaussian quantum states, a special type of quantum state, can address this issue, generating the required states, such as Gottesman-Preskill-Kitaev (GKP) qubits, is extremely difficult. Fortunately, recent advancements in theory and experimental techniques have made the generation of these states a tangible possibility. This presentation will first outline the optical approach and introduce our efforts towards ultra-fast optical quantum computing using waveguide-type optical parametric amplifiers (OPAs). Next, we will introduce the research on non-Gaussian quantum states using photon-number resolving detectors (PNRDs) as a method to overcome the challenges of optical quantum computing.
Bio: Mamoru Endo graduated from the Department of Applied Physics, University of Tokyo in 2011, and completed a Ph.D. in Applied Physics at the Graduate School of Engineering, University of Tokyo in 2016. After serving as a Project Researcher at the Institute for Solid State Physics, University of Tokyo, and a Research Associate in the Department of Physics at the University of Colorado, he became an Assistant Professor in the Department of Applied Physics, University of Tokyo in April 2019. He has been a Lecturer since April 2022. His areas of expertise are continuous-variable optical quantum information processing, optical frequency combs, and photon-number resolving detectors.
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