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Updated: Jun 8, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Optical continuous-variable qubit.

Jonas S Neergaard-Nielsen1, Makoto Takeuchi, Kentaro Wakui

  • 1National Institute of Information and Communications Technology, 4-2-1 Nukui-kitamachi, Koganei, Tokyo 184-8795, Japan.

Physical Review Letters
|September 28, 2010
PubMed
Summary
This summary is machine-generated.

Researchers engineered a quantum bit using two optical continuous-variable states. This breakthrough enables arbitrary superpositions, paving the way for advanced quantum computing with coherent states.

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Last Updated: Jun 8, 2026

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Area of Science:

  • Quantum computing
  • Quantum optics
  • Continuous-variable quantum information

Background:

  • Quantum information science leverages quantum phenomena for computation.
  • Coherent states are crucial for optical communication and quantum computing.
  • Creating superpositions of continuous-variable states is a significant challenge.

Purpose of the Study:

  • To engineer and characterize a qubit composed of two optical continuous-variable states.
  • To overcome the difficulty in preparing superpositions of continuous-variable quantum states.

Main Methods:

  • Utilized squeezed vacuum states as a quantum resource.
  • Employed a specialized photon-subtraction technique.
  • Performed complete engineering and characterization of the qubit.

Main Results:

  • Successfully prepared arbitrary superpositions of squeezed vacuum and single-photon states with high precision.
  • Demonstrated a functional qubit based on continuous-variable states.

Conclusions:

  • The developed method provides a robust way to create superpositions of optical continuous-variable states.
  • This work advances the realization of quantum computing based on coherent states.
  • Enables potential future demonstrations of coherent state quantum computing.