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Journal Article

Quantum-limited time-frequency estimation through mode-selective photon measurement

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

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1805.02491.pdf
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Citation

Donohue, J. M., Ansari, V., Řeháček, J., Hradil, Z., Stoklasa, B., Paúr, M., et al. (2018). Quantum-limited time-frequency estimation through mode-selective photon measurement. Physical Review Letters, 121(9): 090501. doi:10.1103/PhysRevLett.121.090501.


Cite as: https://hdl.handle.net/21.11116/0000-0006-DF2F-C
Abstract
By projecting onto complex optical mode profiles, it is possible to estimate arbitrarily small separations between objects with quantum-limited precision,
free of uncertainty arising from overlapping intensity profiles. Here we extend these techniques to the time-frequency domain using mode-selective sum-frequency generation with shaped ultrafast pulses. We experimentally resolve temporal and spectral separations between incoherent mixtures of
single-photon level signals ten times smaller than their optical bandwidths with a ten-fold improvement in precision over the intensity-only Cramér-Rao
bound.