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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Published on: May 30, 2014

Demonstration of a controlled-phase gate for continuous-variable one-way quantum computation.

Ryuji Ukai1, Shota Yokoyama, Jun-ichi Yoshikawa

  • 1Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Tokyo 113-8656, Japan.

Physical Review Letters
|January 17, 2012
PubMed
Summary
This summary is machine-generated.

Researchers demonstrate a controlled-phase gate for continuous variables using optical cluster states. This quantum gate enables measurement-based quantum computation for implementing Gaussian operations.

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Area of Science:

  • Quantum Information Science
  • Quantum Optics
  • Continuous-Variable Quantum Computing

Background:

  • Continuous-variable (CV) quantum computing utilizes properties of quantum systems like position and momentum.
  • Cluster states are crucial resources for measurement-based quantum computation (MBQC).
  • Implementing controlled quantum gates is essential for universal quantum computation.

Purpose of the Study:

  • To experimentally demonstrate a controlled-phase gate for continuous variables.
  • To utilize a four-mode optical cluster state as a resource for this gate.
  • To verify the quantum nature of the implemented gate.

Main Methods:

  • Employed a teleportation-based scheme to couple input states with the cluster state.
  • Utilized a four-mode optical cluster state resource.
  • Verified the output entanglement for a product two-mode coherent input state.

Main Results:

  • Successfully demonstrated a controlled-phase gate for continuous variables.
  • Showcased that entanglement from the cluster state manifests as the entangling gate in the output modes.
  • Verified the quantum nature of the gate through output entanglement.

Conclusions:

  • The demonstrated controlled-phase gate is a key component for MBQC.
  • Combining this gate with single-mode Gaussian operations allows for universal multimode Gaussian operations via MBQC.
  • This work advances the implementation of measurement-based quantum computation.