RT Journal Article
T1 Quantum-limited time-frequency estimation through mode-selective photon measurement
A1 Donohue, J. M.
A1 Ansari, V.
A1 Řeháček, Jaroslav
A1 Hradil, Zdenek
A1 Stoklasa, Bohumil
A1 Paúr, Martin
A1 Sánchez Soto, Luis Lorenzo
A1 Silberhorn, C.
AB 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 Cramer-Rao bound.
PB American Physical Society
SN 0031-9007
YR 2018
FD 2018-08-27
LK https://hdl.handle.net/20.500.14352/12251
UL https://hdl.handle.net/20.500.14352/12251
LA eng
NO We thank K. Bonsma-Fisher, O. DiMatteo, J. Gil-López, M. Allgaier, C. Fabre, N. Treps, and B. Brecht for fruitful discussions. This research has received funding from the European Unions (EU) Horizon 2020 research and innovation program under Grant Agreement No. 665148, the Grant Agency of the Czech Republic (Grant No. 18-04291S), Palacký University (Grant No. IGA-PrF-2018-003), and the Spanish MINECO (Grant No. FIS2015-67963-P). J. M. D. gratefully acknowledges support from Natural Sciences and Engineering Research Council of Canada.
NO Unión Europea. H2020
NO Ministerio de Economía y Competitividad (MINECO)
NO Grant Agency of the Czech Republic
NO Palacky University
DS Docta Complutense
RD 10 jul 2025