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Ultrafast measurement of a single-photon wave packet using an optical Kerr gate
- Source :
- Optics Express. 30:4999
- Publication Year :
- 2022
- Publisher :
- Optica Publishing Group, 2022.
-
Abstract
- 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.
- Subjects :
- Atomic and Molecular Physics, and Optics
Subjects
Details
- ISSN :
- 10944087
- Volume :
- 30
- Database :
- OpenAIRE
- Journal :
- Optics Express
- Accession number :
- edsair.doi.dedup.....94832513785c4296a9ddea5088dc5745