Eur. Phys. J. D 62, 433-437 (2011)
https://doi.org/10.1140/epjd/e2011-20036-1

Regular Article

Experimental generation of optical non-classical states of light with 1.34 μm wavelength

State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan, 030006, P.R. China

^a e-mail: jiaxj@sxu.edu.cn

Received: 22 October 2010
Received in final form: 17 February 2011
Published online: 25 March 2011

Abstract

We report the experimental generation of the optical non-classical states with 1.34 μm wavelength which is close to one of the fiber telecommunication windows (1.31 μm). The single-mode amplitude squeezed states with quantum fluctuation of 2.3 ± 0.1 dB below the shot noise limit (SNL) and the entangled states with quantum correlation of 1.1 ± 0.1 dB below the SNL are produced by an optical parametric amplifier with a type-I phase-matched PPKTP crystal and a pair of properly oriented type-II phase-matched KTP crystals, respectively.