Effect of dark counts on single-photon heralding with quasi-number-resolving detection schemes

Abstract

We consider photon heralding with quasi-number-resolving detection schemes and account for detection efficiencies and dark count probabilities. With a straightforward formalism, we develop closed-form expressions for the heralding probability, photon number distribution of the resulting heralded state, and fidelity of this heralded state to a single-photon state. We calculate that this fidelity has a maximum as a function of the number of multiplexed detection modes and that, for experimental configurations in which the maximum is reached for quite a large number of detection modes, it can still be highly beneficial to multiplex fewer modes.

Photon-number parity of heralded single photons from a Bragg-reflection waveguide reconstructed loss-tolerantly via moment generating function

“…Due to the experimental imperfections, like the optical losses both in the state manipulation and target state detection, the measured photon statistics are often degraded and the fragile quantum features are lost [14,15]. In order to decouple the effect of these two loss contributions one can investigate the target state properties with the help of the normalized factorial moments of the photon number that can be extracted independent of the detection losses.…”