Phys. Rev. Lett. 59, 2044–2046 (1987)Measurement of subpicosecond time intervals between two photons by interferenceReceived 10 July 1987; published in the issue dated 2 November 1987 A fourth-order interference technique has been used to measure the time intervals between two photons, and by implication the length of the photon wave packet, produced in the process of parametric down-conversion. The width of the time-interval distribution, which is largely determined by an interference filter, is found to be about 100 fs, with an accuracy that could, in principle, be less than 1 fs. © 1987 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.59.2044
DOI:
10.1103/PhysRevLett.59.2044
PACS:
42.50.Bs, 42.65.Re
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