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Journal Article

Achieving the ultimate quantum timing resolution

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Sanchez-Soto,  Luis
Quantumness, Tomography, Entanglement, and Codes, Leuchs Emeritus Group, Emeritus Groups, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Ansari, V., Brecht, B., Gil-López, J., Donohue, J. M., Řeháček, J., Hradil, Z., et al. (2021). Achieving the ultimate quantum timing resolution. PRX Quantum, 2(1): 010301. doi:10.1103/PRXQuantum.2.010301.


Cite as: https://hdl.handle.net/21.11116/0000-0008-1298-8
Abstract
Accurate time-delay measurement is at the core of many modern technologies.
Here, 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 ten 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.