研究目的
To enhance the per-bin single-photon delivery probability by multiplexing heralded single photons generated by four-wave mixing in photonic crystal fibre using a fibre delay loop controlled by a single switch.
研究成果
The experiment successfully demonstrated that the probability of delivering a single photon per bin can be enhanced in an integrated architecture by combining four time bins with only a single optical switch. Advances in fibre-integrated optical switch technology will enable much larger numbers of bins to be combined while retaining the benefits of an alignment-free package.
研究不足
The performance of the scheme is critically dependent on switch and fibre loss. The improvement in delivery probability achieved by the system is relatively modest.
1：Experimental Design and Method Selection:
The experiment involves a multiplexed single photon source that uses a fibre delay loop controlled by a single switch to re-synchronise heralded single photons generated by four-wave mixing in photonic crystal fibre.
2：Sample Selection and Data Sources:
The source was pumped by ～1 ps duration pulses at 1064 nm derived from a 10 MHz amplified modelocked fibre laser pulse-picked to 5 MHz.
3：List of Experimental Equipment and Materials:
Photonic crystal fibre (PCF), fibre Bragg gratings, bandgap-guiding fibres, silicon avalanche photodiode, 2×1 optical switch, SMF-28 fibre, 2×2 optical switch (Boston Applied Technologies Inc. Nanona), field-programmable gate array (FPGA) logic.
4：Experimental Procedures and Operational Workflow:
The delay loop was inserted or removed from the optical path by a fibre-integrated 2×2 optical switch. The switch state was conditioned to be open only when the heralding detector had fired.
5：Data Analysis Methods:
The performance of the multiplexing scheme was assessed through measuring the count rates in the target bin with and without loop multiplexing enabled.
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