%0 Journal Article
%A De, Syamsundar
%A Gil López, Jano
%A Brecht, Benjamin
%A Silberhorn, Christine
%A Sánchez Soto, Luis Lorenzo
%A Hradil, Zdeněk
%A Řeháček, Jaroslav
%T Effects of coherence on temporal resolution
%D 2021
%@ 2643-1564
%U https://hdl.handle.net/20.500.14352/4425
%X 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.
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