• Rapid Communication

Continuous-variable quantum swapping gate between light and atoms

T. Takano, M. Fuyama, R. Namiki, and Y. Takahashi
Phys. Rev. A 78, 010307(R) – Published 15 July 2008

Abstract

In the face of the recent development of the time-domain detection method for short pulses, typically less than 1 microsecond, we consider a feasible method for a continuous variable quantum swapping gate between light polarization and atomic spin ensemble by three successive Faraday rotation interactions using short pulses. This method does not need any particular initial states and its fidelity can ideally run up to one. It also works as a quantum memory of light and a device to generate a nonclassical state of the spin. To evaluate a quantum nature of the proposed swapping gate, we calculated its average fidelity for a set of the coherent states with a Gaussian distribution and confirmed the efficiency as a quantum gate as well as a quantum memory of light.

  • Figure
  • Figure
  • Received 21 December 2007

DOI:https://doi.org/10.1103/PhysRevA.78.010307

©2008 American Physical Society

Authors & Affiliations

T. Takano1, M. Fuyama2, R. Namiki2,3, and Y. Takahashi1,2

  • 1Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
  • 2CREST, JST, 4-1-8 Honcho Kagwaguchi, Saitama 332-0012, Japan
  • 3Division of Materials Physics, Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 78, Iss. 1 — July 2008

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review A

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×