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Quantum-correlated twin photons from microstructure fiber

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Abstract

We present a source of correlated photon pairs that relies on spontaneous parametric scattering in microstructure fiber. Quantum correlations are shown between photon pairs that are generated through four-photon scattering where the pump photons are degenerate at a wavelength of 749 nm and the signal and idler photons are nondegenerate at wavelengths of 761 nm and 737 nm, respectively. Careful adjustment of the pump wavelength and polarization are shown to be critical to observing quantum correlations.

©2004 Optical Society of America

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Figures (6)

Fig. 1.
Fig. 1. Experimental measurements of group delay as a function of wavelength for the MF used in our experiments. Second-order polynomial fits accompany the data. The two curves are for the two polarization modes of the MF, clearly showing that there are differences in the GVD behavior for the two modes. Inset shows plots of D vs. wavelength for the same MF and the λ 0 values are indicated for each polarization mode.
Fig. 2.
Fig. 2. A schematic of the experiment used to generate and detect quantum correlated twin photons generated in MF.
Fig. 3.
Fig. 3. Graphs showing the spectral response of the detection filter in comparison with the bandwidth of the injected pump. Note that the passband centers of the detection filter for the signal and idler are located symmetrically with respect to the pump’s center wavelength, and that the detection bandwidth (2.1 nm FWHM) is considerably larger than the pump bandwidth (0.3 nm FWHM).
Fig. 4.
Fig. 4. Graphs showing the idler count rate for FPS with different pump wavelengths and a given detection filter setting. Data points are accompanied by theoretical scattering curves, which were fitted to the data using Eqs. (1–3). The λ 0 is assumed to be 748 nm for these calculations. One sees that the optimum response is achieved for a pump wavelength of 749 nm. The dashed curve in the inset shows the measured filter response for the idler passband in comparison with the theoretical variation of FPS efficiency versus wavelength.
Fig. 5.
Fig. 5. Histogram data gathered using the multichannel scaler where one counter is used to trigger the acquisition and the other is taken to be the signal. One bin, the coincident bin, has many more counts than the others indicating that the coincident events are registered at the PCMs with a higher probability than non-coincident events. The variation in the counts in the non-coincident bins is due to asynchronous photon detection relative to the arrival of pump pulses.
Fig. 6.
Fig. 6. Plots of total coincidence counts (triangles) and accidental coincidence counts (boxes) as a function of the number of pump photons per pulse with the photon counters aligned to detect at 737 nm and 761 nm wavelengths, respectively. At low pump powers there is a quadratic dependence of the counts on pump power, but as the power is increased the increasing signal and idler count rates start saturating the photon counters. The inset shows true coincidences (the difference between the total coincidence counts and the accidental coincidence counts) as a function of the number of pump photons per pulse.

Tables (1)

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Table 1. Various properties of the OFS MF used in these experiments.

Equations (6)

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A 1 z = α 2 A 1 + i γ ( A 1 2 A 1 ) ,
A 2 z = α 2 A 2 + i γ [ ( 2 A 1 2 ) A 2 + A 1 2 A 3 * e i Δ k z ] ,
A 3 z = α 2 A 3 + i γ [ ( 2 A 1 2 ) A 3 + A 1 2 A 2 * e i Δ k z ] ,
κ = 2 γ P 1 + Δ k 2 γ P 1 + β ( ω 2 ω 1 ) 2 = 0 ,
Delay = a λ 2 + b λ + c ,
R = a 1 [ ( G G 0 ) + b 1 ( P pump ) ] ,
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