2026-08-16T14:13:58Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/44252023-08-27T03:15:10Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc De, Syamsundar author Gil López, Jano author Brecht, Benjamin author Silberhorn, Christine author Sánchez Soto, Luis Lorenzo author Hradil, Zdeněk author Řeháček, Jaroslav author 2021-07-22 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. 2643-1564 10.1103/PhysRevResearch.3.033082 https://hdl.handle.net/20.500.14352/4425 https://doi.org/10.1103/PhysRevResearch.3.033082 https://journals.aps.org Effects of coherence on temporal resolution