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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 8 — Apr. 21, 2014
  • pp: 9182–9192

Optical continuous-variable quadratic phase gate via Faraday interaction

Ming-Feng Wang, Nian-Quan Jiang, and Yi-Zhuang Zheng  »View Author Affiliations

Optics Express, Vol. 22, Issue 8, pp. 9182-9192 (2014)

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The continuous-variable (CV) quadratic phase gate is one of the most fundamental CV quantum gates for universal CV quantum computation, while its experimental realization still remains a challenge. Here we propose a novel and experimentally feasible scheme to realize optical CV quadratic phase gate via Faraday interaction in an atomic ensemble. The gate is performed by simply sending an optical beam three times through an atomic medium prepared in coherent spin state. The fidelity of the gate can ideally run up to one. We show that the scheme also works well as a device to generate optical polarization squeezing. Considering the noise effects due to atomic decoherence and light losses, we find that the observed fidelities of gate operation and the attainable degree of polarization squeezing are still quite high.

© 2014 Optical Society of America

OCIS Codes
(270.0270) Quantum optics : Quantum optics
(270.6570) Quantum optics : Squeezed states
(270.5585) Quantum optics : Quantum information and processing

ToC Category:
Quantum Optics

Original Manuscript: February 7, 2014
Revised Manuscript: March 21, 2014
Manuscript Accepted: March 24, 2014
Published: April 8, 2014

Ming-Feng Wang, Nian-Quan Jiang, and Yi-Zhuang Zheng, "Optical continuous-variable quadratic phase gate via Faraday interaction," Opt. Express 22, 9182-9192 (2014)

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