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1.5-μm band quantum-correlated photon pair generation in dispersion-shifted fiber: suppression of noise photons by cooling fiber

Hiroki Takesue and Kyo Inoue

Open Access Open Access

Abstract

Spontaneous four-wave mixing in a dispersion-shifted fiber (DSF) is a promising approach for generating quantum-correlated photon pairs in the 1.5 μm band. However, it has been reported that noise photons generated by the spontaneous Raman scattering process degrade the quantum correlation of the generated photons. This paper describes the characteristics of quantum-correlated photon pair generation in a DSF cooled by liquid nitrogen. With this technique, the number of noise photons was sufficiently suppressed and the ratio of true coincidence to accidental coincidence was increased to ~30.

©2005 Optical Society of America

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Figures (4)
Fig. 1.
Fig. 1. Experimental setup. PC: polarization controller, D: photon counter.

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Fig. 2.
Fig. 2. C value as a function of number of idler photons per pulse. Squares: cooled, x symbols: uncooled. The dotted line shows C when there are no noise photons.

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Fig. 3.
Fig. 3. Number of quantum correlated photon pairs per pulse as a function of pump peak power. Squares: cooled, x symbols: uncooled.

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Fig. 4.
Fig. 4. Number of noise photons per pulse as a function of pump peak power for (a) Stokes photons (idler channel) and (b) anti-Stokes photons (signal channel). Squares: cooled, x symbols: uncooled.

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Tables (1)

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Table I. Loss after DSF and characteristics of photon counters.

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Equations (14)

Equations on this page are rendered with MathJax. Learn more.

2 ω p = ω s + ω i
2 k p = k s + k i .
d n s dz = − α n s + g e − αz 1 − P 1 P 0 ,
d n as dz = − α n as + g e − αz P 0 P 1 − 1 ,
P 1 P 0 = exp ( − hν k B T ) ,
n s ( T ) = gL e − αL 1 − exp ( − hν k B T ) ,
n as ( T ) = gL e − αL exp ( hν k B T ) − 1 ,
c s = ( μ c + μ sn ) + α s + d s ,
c i = ( μ c + μ in ) + α i + d i ,
p c = μ c α s c s .
R m = c s ( p c α i + c i ) .
R um = c s c i .
C = R m R um = μ c α s α i c s c i + 1 .
ε ≃ 1 2 C .
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