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Nonlinear feedforward enabling quantum computation.

Atsushi Sakaguchi1,2, Shunya Konno3, Fumiya Hanamura3

  • 1Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan. atsushi.sakaguchi@riken.jp.

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Researchers demonstrate fast, flexible nonlinear feedforward for quantum computation. This essential measurement technique reduces excess noise by 10% using non-Gaussian states, advancing fault-tolerant quantum computing.

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Area of Science:

  • Quantum Information Science
  • Optical Quantum Computing
  • Quantum Computation

Background:

  • Scalable quantum computing is pursued via measurement-based approaches.
  • Optical time-domain multiplexing offers a promising route for scalability.
  • Fault tolerance and universality require advanced feedforward techniques.

Purpose of the Study:

  • To demonstrate fast and flexible nonlinear feedforward for quantum computation.
  • To realize essential measurements for fault-tolerant and universal quantum computation.
  • To reduce measurement excess noise in optical quantum computing.

Main Methods:

  • Implementing nonlinear electro-optical feedforward.
  • Utilizing non-Gaussian ancillary states for measurements.
  • Employing optical time-domain multiplexing for scalability.

Main Results:

  • Demonstrated a fast and flexible nonlinear feedforward mechanism.
  • Achieved a 10% reduction in measurement excess noise.
  • Validated the essential role of nonlinear feedforward in quantum computation.

Conclusions:

  • Nonlinear feedforward is crucial for fault-tolerant and universal quantum computation.
  • Non-Gaussian ancillary states significantly reduce measurement noise.
  • This work advances the realization of scalable optical quantum computers.