Related papers: Temporal coherence of single photons emitted by hexagonal Boron Nitride defects at room temperature

Temporal coherence of single photons emitted by hexagonal Boron Nitride defects at room temperature

URL: http://arxiv.org/abs/2505.10644v1
Date: Thu, 15 May 2025 18:32:29 GMT
Title: Temporal coherence of single photons emitted by hexagonal Boron Nitride defects at room temperature
Authors: J. -V. Vidal Martínez-Pons, S. -K. Kim, M. Behrens, A. Izquierdo-Molina, A. Menendez Rua, S. Paçal, S. Ateş, L. Viña, C. Antón-Solanas,
Abstract summary: Color centers in hexagonal boron nitride (hBN) emerge as promising quantum light sources at room temperature.<n>We report the coherence time of the single photons emitted by an hBN defect in a nanocrystal at room temperature, measured via Michelson interferometry.<n>Results highlight the presence of a strong phonon-electron coupling, suggesting the need to work at cryogenic temperatures to enable quantum photonic applications based on photon interference.
Score: 0.0
License: http://creativecommons.org/licenses/by/4.0/
Abstract: Color centers in hexagonal boron nitride (hBN) emerge as promising quantum light sources at room temperature, with potential applications in quantum communications, among others. The temporal coherence of emitted photons (i.e. their capacity to interfere and distribute photonic entanglement) is essential for many of these applications. Hence, it is crucial to study and determine the temporal coherence of this emission under different experimental conditions. In this work, we report the coherence time of the single photons emitted by an hBN defect in a nanocrystal at room temperature, measured via Michelson interferometry. The visibility of this interference vanishes when the temporal delay between the interferometer arms is a few hundred femtoseconds, highlighting that the phonon dephasing processes are four orders of magnitude faster than the spontaneous decay time of the emitter. We also analyze the single photon characteristics of the emission via correlation measurements, defect blinking dynamics, and its Debye-Waller factor. Our room temperature results highlight the presence of a strong phonon-electron coupling, suggesting the need to work at cryogenic temperatures to enable quantum photonic applications based on photon interference.

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