期刊
OPTICS EXPRESS
卷 30, 期 4, 页码 4999-5007出版社
Optica Publishing Group
DOI: 10.1364/OE.446010
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资金
- Ministry of Education, Culture, Sports, Science and Technology [JPMXS0118069242]
- Japan Society for the Promotion of Science [JP18H05245]
- National Natural Science Foundation of China [11704290, 12074299, 91836102]
- Engineering and Physical Sciences Research Council UK National Quantum Technology Hub in Quantum Computing and Simulation [EP/T001062/1]
Ultrafast quantum optics requires a single-photon detector with sub-picosecond temporal resolution. Researchers have proposed an ultrafast single-photon detection method using an optical Kerr gate, which achieves a temporal resolution of up to 224 +/- 9 fs using a photonic crystal fiber (PCF) and a Sagnac interferometer.
Ultrafast quantum optics with time-frequency entangled photons is at the forefront of progress towards future quantum technologies. However, to unravel the time domain structure of entangled photons and exploit fully their rich dimensionality, a single-photon detector with sub-picosecond temporal resolution is required. Here, we present ultrafast single-photon detection using an optical Kerr gate composed of a photonic crystal fiber (PCF) placed inside a Sagnac interferometer. A near-rectangle temporal waveform of a heralded single-photon generated via spontaneous parametric down-conversion is measured with temporal resolution as high as 224 +/- 9 fs. The large nonlinearity and long effective interaction length of the PCF enables maximum detection efficiency to be achieved with only 30.5 mW gating pulse average power, demonstrating an order-of-magnitude improvement compared to optical gating with sum-frequency generation. Also, we discuss the trade-off relationship between detection efficiency and temporal resolution. Published by Optica Publishing Group under the terms of the Creative Commons Attribution 4.0 License.
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