Publication: Achieving the ultimate quantum timing resolution
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2021-01-04
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American Physical Society
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Abstract
Accurate time-delay measurement is at the core of many modern technologies. We present a temporal-mode demultiplexing scheme that achieves the ultimate quantum precision for the simultaneous estimation of the temporal centroid, the time offset, and the relative intensities of an incoherent mixture of ultrashort pulses at the single-photon level. We experimentally resolve temporal separations 10 times smaller than the pulse duration, as well as imbalanced intensities differing by a factor of 10(2). This represents an improvement of more than an order of magnitude over the best standard methods based on intensity detection.
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© Published by the American Physical Society.
We acknowledge financial support from the European Union’s Horizon 2020 research and innovation program (Project ApresSF), the Deutsche Forschungsgemeinschaft (Grant No. 231447078–TRR 142), the Grant Agency of
the Czech Republic (Grant No. 18-04291S), the Spanish Ministerio de Ciencia e Innovación (Grant No. PGC2018-099183-B-I00), and the Q-FARM Bloch Fellowship.