研究目的
Investigating the generation of frequency nondegenerate correlated photon pairs and heralded single photons via spontaneous four-wave mixing in micro- or nano?bers.
研究成果
The research demonstrated the successful generation of correlated photon pairs and heralded single photons via SFWM in MNFs, with good agreement between theoretical predictions and experimental results. The MNF-based source is compatible with existing fiber communication networks and offers potential for increased photon generation rates through spatial multiplexing.
研究不足
The study was limited by the low generation rate of heralded photons and the large deadtimes of the detection system, which required long experiment durations to accumulate sufficient data.
1：Experimental Design and Method Selection:
The study utilized spontaneous four-wave mixing (SFWM) in micro- or nano?bers (MNFs) for generating photon pairs. Theoretical models were employed to predict the joint spectral intensity (JSI) of the biphoton field.
2：Sample Selection and Data Sources:
MNFs were fabricated from standard optical fibers using a heating and stretching method. The MNFs had a waist diameter of about 890 nm and a waist length of 14 mm.
3：List of Experimental Equipment and Materials:
The setup included a pulsed laser, laser line filter, notch filters, dichroic mirror, interference filter, single-photon detectors, and a coincidence counter.
4：Experimental Procedures and Operational Workflow:
The pump field was focused into the MNFs, and the generated biphoton field was separated into signal and idler photons. The photons were then filtered and detected to measure JSI and autocorrelation functions.
5：Data Analysis Methods:
The data was analyzed to determine the photon pair conversion efficiency, generation rate, and the second-order autocorrelation function.
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single-photon detector
ID210
ID Quantique
Detecting idler photons in the IR range.
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single-photon detector
SPCM-AQRH
Perkin-Elmer
Detecting signal photons in the visible range.
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coincidence counter
id800
ID Quantique
Comparing signals from both SPDs to measure coincidences.
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laser line filter
Filtering the pump field.
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notch filter
Cutting off the pump field radiation after the fiber.
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dichroic mirror
Dividing the biphoton field into signal and idler photons.
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interference filter
Filtering signal photons.
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coarse wavelength division multiplexing unit
CWDM
Filtering idler photons.
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