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Two-color ghost interference with photon pairs generated in hot atoms
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Figures

Image of FIG. 1.

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FIG. 1.

(a) Energy levels diagram of 85Rb used in our experiment. Δ is the detuning between the frequency of Pump 2 and the transition frequency between |3> and |2>, blue shift of Δ represents positive in our experiment. (b) Experiment setup. Signal 2 photons are collected by a multi-mode fiber, signal 1 photons are collected by a single-mode fiber. λ/2: half of wave plates; PBS: polarization beam splitter; DG535: delay generator; Detector 1: InGaAs Photon Detector; Detector 2: Avalanche diode.

Image of FIG. 2.

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FIG. 2.

Our simple theoretical diagram for fitting experimental data. f is focal length of lens system; In our experiment, f is about 220 mm.

Image of FIG. 3.

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FIG. 3.

(a) Double-slit interference pattern with two-color photon through scanning the position of Detector 2. Red points are experimental data, and blue line is theoretical fit using Eq. (1). (b) Single counts of signal 2 photons with scanning of Detector 2.

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/content/aip/journal/adva/2/3/10.1063/1.4754857
2012-09-19
2014-04-17

Abstract

We report on an experimental observation of a two-photon ghost interference experiment. A distinguishing feature of our experiment is that the photons are generated via a non-degenerated spontaneous four-wave mixing process in a hot atomic ensemble; therefore the photon has narrow bandwidth. Besides, there is a large difference in frequency between two photons in a pair. Our works may be important to achieve more secure, large transmission capacity long-distance quantum communication.

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Scitation: Two-color ghost interference with photon pairs generated in hot atoms
http://aip.metastore.ingenta.com/content/aip/journal/adva/2/3/10.1063/1.4754857
10.1063/1.4754857
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