RT Journal Article
T1 Effects of coherence on temporal resolution
A1 De, Syamsundar
A1 Gil López, Jano
A1 Brecht, Benjamin
A1 Silberhorn, Christine
A1 Sánchez Soto, Luis Lorenzo
A1 Hradil, Zdeněk
A1 Řeháček, Jaroslav
AB Measuring small separations between two optical sources, either in space or in time, constitutes an important metrological challenge as standard intensity-only measurements fail for vanishing separations. Contrarily, it has been established that appropriate coherent mode projections can appraise arbitrarily small separations with quantum-limited precision. However, the question of whether the optical coherence brings any metrological advantage to mode projections is still a point of debate. Here, we elucidate this problem by experimentally investigating the effect of varying coherence on estimating the temporal separation between two single-photon pulses. We show that, for an accurate interpretation, special attention must be paid to properly normalize the quantum Fisher information to account for the strength of the signal.
PB American Physical Society
SN 2643-1564
YR 2021
FD 2021-07-22
LK https://hdl.handle.net/20.500.14352/4425
UL https://hdl.handle.net/20.500.14352/4425
LA eng
NO ©2021 American Physical Society.We thank V. Ansari and J. M. Donohue for discussions. This work received funding from the European Union’s Horizon 2020 research and innovation programme under grant Agreement No. 899587. This work was supported by the European Union’s Horizon 2020 research and innovation programmeunder the QuantERA programme through the Project ApresSF. We acknowledge support from the Grant Agency of the Czech Republic (18-04291S) and the Spanish Ministerio de Ciencia e Innovación (PGC2018-099183-B-I00).
NO Unión Europea. H2020
NO Ministerio de Ciencia e Innovación (MICINN)
NO Grant Agency of the Czech Republic
DS Docta Complutense
RD 7 abr 2025