Perfect single-photon sources

• URL: http://arxiv.org/abs/2306.13646v2
• Date: Mon, 17 Jul 2023 18:36:12 GMT
• Title: Perfect single-photon sources
• Authors: Sana Khalid and Fabrice P. Laussy
• Abstract summary: We introduce the "gapped coherent state" in the form of a single-photon source (SPS) that consists of uncorrelated photons as a background. No obvious quantum mechanism is yet identified to produce exactly such a photon stream. We study the statistical properties of such a hypothetical signal, which exhibits counter-intuitive features.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We introduce the "gapped coherent state" in the form of a single-photon source (SPS) that consists of uncorrelated photons as a background, except that we demand that no two photons can be closer in time than a time gap $t_\mathrm{G}$. While no obvious quantum mechanism is yet identified to produce exactly such a photon stream, a numerical simulation is easily achieved by first generating an uncorrelated (Poissonian) signal and then for each photon in the list, either adding such a time gap or removing all successive photons that are closer in time from any photon that is kept than $t_\mathrm{G}$. We study the statistical properties of such a hypothetical signal, which exhibits counter-intuitive features. This provides a neat and natural connection between continuous-wave (stationary) and pulsed single-photon sources, with also a bearing on what it means for such sources to be perfect in terms of single-photon emission.

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