Abstract

Colloidal quantum dots (CQDs) are attractive material for single-photon sources (SPSs) that can be utilized at room temperature. In this work, we performed simultaneous measurements of photoluminescence (PL) decay curve and second-order photon correlation, g(2), on single CQDs to study the purity of their single photons, which is determined by the value of g(2)at the time origin. We demonstrate that the single-photon purity can be improved through time-gated g(2) analysis, where a part of the PL signal is excluded by applying a temporal filter to the PL decay curve. We show that by using a superconducting nanowire single-photon detector, it is possible to observe highly-purified single photons that exhibited g(2) at the time origin ranging from 0.01 to 0.02.

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