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Serrodyne electro-optic frequency shift of single photons from a solid-state emitter

Sanjay Kapoor, Aleksander Rodek, Michał Mikołajczyk, Jerzy Szuniewisz, Filip Sośnicki, T. Kazimierczuk, P. Kossacki, Michał Karpiński

Published Jan 1, 2025• 0 citations
Publisher

Abstract

We demonstrate the frequency shifting of photons emitted from a quantum dot source using electro-optic serrodyne modulation while preserving the purity and indistinguishability of the source.
DOI
10.1364/cleo_at.2025.jps200_28

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Abstract Hybrid quantum technologies aim to combine diverse quantum systems, mirroring classical computers' integration of electronic, photonic, magnetic, and mechanical components. Quantum dots in semiconductor nanowires emit high-purity, deterministic single photons with high repetition, while atomic ensembles offer photon storage and strong optical nonlinearities controllable by single photons. To interface quantum dots with atomic ensembles successfully, precise optical frequency matching of these two platforms is crucial. We demonstrate a simple, precise, reversible, broad-range, and local method for controlling the emission frequency of individual quantum dots embedded in tapered semiconductor nanowires. We then interface the quantum dots with an atomic ensemble via single-photons matched to hyperfine transitions and slow-light regions of the cesium D1-line. Our approach allows linking atomic and solid-state quantum systems and can potentially also be applied to other types of nanowire-embedded solid-state emitters, as well as for creating devices based on multiple solid-state emitters tuned to produce indistinguishable photons.
Summary form only given. Here we demonstrate a novel frequency-multiplexed scheme in which the number of physical components is independent of the number of heralded sources to be combined. In particular, we use one nonlinear interaction, one heralding wavelength-resolving detector, and one electro-optic phase modulator (Fig. 1a). A pulsed spontaneous PDC source generates frequency-correlated photon pairs (Fig. 1b). We use a time-of-flight singlephoton spectrometer [4] to measure a heralding photon with 0.09 nm resolution. Feed-forward control with an electro-optic serrodyne modulator [5] shifts the heralded photon to the desired output frequency (Fig. 1c).