A research team led by Kento Tsubouchi (Graduate Student, the University of Tokyo), Yosuke Mitsuhashi (Postdoctoral Researcher, the University of Tokyo at the time of the study, now a Postdoctoral Researcher at RIKEN), Ryuji Takagi (Associate Professor, the University of Tokyo), and Nobuyuki Yoshioka (Associate Professor, the University of Tokyo), has developed a new method called “symmetric channel verification” that efficiently detects and removes noise in quantum computations by utilizing the symmetry of quantum channels.
While conventional symmetry-based noise reduction techniques have been limited to static property, namely the quantum states, this study demonstrates for the first time that the same concept can be applied to dynamical property—quantum channels themselves. The method successfully detects and eliminates noise that breaks the channel’s symmetry, thereby significantly expanding the range of noise that can be removed in quantum processors. This achievement provides a powerful new approach for performing high-precision quantum simulations of symmetric quantum systems—which play a crucial role in condensed matter physics, high-energy physics, and quantum chemistry—even on near-future quantum computers that lack full fault tolerance.
Schematic illustration of symmetric channel verification
Papers
Journal: PRX Quantum
Title: Symmetric channel verification for purifying noisy quantum channels
Authors: Kento Tsubouchi*, Yosuke Mitsuhashi, Ryuji Takagi, and Nobuyuki Yoshioka
DOI: 10.1103/jcd6-lft3
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