Dr. Toshiyuki Ihara Profile

Dr. Toshiyuki Ihara

Researcher at NICT

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Proceedings Article | 4 March 2019 Paper

Impact of a time gate to the purity of single photons emitted from colloidal quantum dots

T. Ihara, S. Miki, T. Yamada, H. Terai

Proceedings Volume 10929, 109290X (2019) https://doi.org/10.1117/12.2507334

KEYWORDS: Single photon, Excitons, Signal processing, Quantum dots, Single photon detectors

Read 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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