Experimental continuous-variable entanglement from a phase-difference-locked optical parametric oscillator

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Experimental continuous-variable entanglement from a phase-difference-locked optical parametric oscillator

Jietai Jing, Sheng Feng, Russell Bloomer, and Olivier Pfister

Phys. Rev. A 74, 041804(R) – Published 16 October 2006

Abstract

We observed continuous-variable entanglement between the bright beams emitted above threshold by an ultrastable optical parametric oscillator (OPO), classically phase locked at a frequency difference of $161.827 324 0 (5) MHz$ . The amplitude-difference squeezing is $- 3 dB$ and the phase-sum one is $- 1.35 dB$ . Besides proving entanglement in a phase-locked OPO, such outstanding frequency-difference stability paves the way for transferring entanglement between different optical frequencies and densely implementing continuous-variable quantum information in the frequency domain.

Received 19 April 2006

DOI:https://doi.org/10.1103/PhysRevA.74.041804

Authors & Affiliations

Jietai Jing^*, Sheng Feng^*, Russell Bloomer, and Olivier Pfister^†

Department of Physics, University of Virginia, 382 McCormick Road, Charlottesville, Virginia 22904-4714, USA

^*Present address: Center for Photonic Communication and Computing, Northwestern University, Evanston, IL.
^†Corresponding author. Electronic address: opfister@virginia.edu

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Vol. 74, Iss. 4 — October 2006

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Physical Review A

covering atomic, molecular, and optical physics and quantum information