Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 64: Solid State Quantum Optics II

Q 64.4: Talk

Friday, March 15, 2024, 11:45–12:00, HS 3219

Efficient heralding of pure single-photons at telecom wavelength from pulsed cavity-enhanced SPDC — •Xavier Barcons Planas^1,2, Helen M. Chrzanowski², Leon Messner², and Janik Wolters^2,3 — ¹Institut für Physik, Humboldt-Universität zu Berlin, Berlin, Germany — ²Institute of Optical Sensor Systems, German Aerospace Center, Berlin, Germany — ³Institut für Optik und Atomare Physik, Technische Universität Berlin, Berlin, Germany

Entangled quantum states of multiple photons are crucial for pushing the boundaries of photonic quantum technologies. The generation of large multi-photon entangled states demands light sources that provide highly pure photons with high efficiency (either deterministic or heralded), as these factors limit scalability. A popular approach is to herald single-photons from photon-pair sources based on spontaneous parametric down-conversion (SPDC). Despite the spatial and spectral multimode emission of the process, potentially constraining the heralding efficiency and purity, the emitted photons can be engineered with single-mode characteristics, through waveguide geometries [1], group velocity matching techniques [2] or cavity resonators [3]. Here, we present a narrowband (170 MHz) single-photon source at the C-band based on pulsed SPDC in a monolithic crystal cavity. Pure (P>95%) and fiber-compatible single-photons have been generated with 85% heralding efficiency.

[1] A. Christ et al., Phys. Rev. A 80, 033829 (2009).

[2] P. J. Mosley et al., Phys. Rev. Lett. 100, 133601 (2008).

[3] R. Mottola et al., Opt. Express 28, 3159 (2020).

Keywords: single-photon; SPDC