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A single photon source for the THz regime

Diego Martín-Cano, Caspar Groiseau, A.I. Fernandez-Dominguez, Miguel Á. Martínez-García, Carlos Sánchez Muñoz

Published Jan 1, 2026• 0 citations
OpenAlex

Abstract

We propose a feasible single-photon source that performs over the THz frequency regime based on a single quantum polar emitter coupled to a nanocavity. We demonstrate nonclassical photon correlations showing the single photon nature of its emission as well as the nonlinear production of multiphoton pairs.

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We present a proposal for a tunable source of single photons operating in the terahertz (THz) regime. This scheme transforms incident visible photons into quantum THz radiation by driving a single polar quantum emitter with an optical laser, with its permanent dipole enabling dressed THz transitions enhanced by the resonant coupling to a cavity. This mechanism offers optical tunability of properties such as the frequency of the emission or its quantum statistics (ranging from antibunching to entangled multiphoton states) by modifying the intensity and frequency of the drive. We show that the implementation of this proposal is feasible with state-of-the-art photonics technology. Published by the American Physical Society 2024
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Sources of highly nonclassical light are important building blocks of many proposed implementations of optical quantum technologies [1]. The most common realisations of nonclassical light sources are either based on two-level quantum emitters or on nonlinear sources of photon pairs and squeezed light [2] and are generally limited in the properties of the quantum states of light they can efficiently generate: single-photon states for two-level systems and squeezed states (with a Gaussian Wigner function) for nonlinear sources.