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Updated: Feb 5, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
Quantum-Limited Time-Frequency Estimation through Mode-Selective Photon Measurement
J M Donohue1, V Ansari1, J Řeháček2
1Integrated Quantum Optics, Paderborn University, Warburger Strasse 100, 33098 Paderborn, Germany.
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 tenfold improvement in precision over the intensity-only Cramér-Rao bound.
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