Single-photon source, comprising: ∘ a support substrate comprising a reflective layer; ∘ a photonic wire, • resting on the support substrate and arranged facing the reflective layer, and extending along a longitudinal axis Δ substantially orthogonal to the plane of the support substrate; • comprising a single-photon emitter; • forming a monomode waveguide for the single photons; and • having transverse dimensions that vary longitudinally in the direction of an upper end (20.2) of the photonic wire, so as to form a mode adapter for a guided optical mode; ∘ an optical excitation device designed to excite the emitter through a laser pulse, and thus to cause the spontaneous emission of single photons by the emitter; ∘ characterized in that the photonic wire is formed of two coaxial parts that are separate and spaced from one another along the longitudinal axis Δ; • a lower part, resting in contact with the support substrate, in which the emitter is arranged, • an upper part, suspended above the lower part and optically coupled thereto, ∘ and in that the single-photon source furthermore comprises a holding structure, comprising: • at least one pillar resting in contact with the support substrate and arranged adjacent to the photonic wire, and • at least one holding arm mechanically connecting the upper part to the pillar and holding the upper part suspended above the lower part. ∘ a support substrate comprising a reflective layer; ∘ a photonic wire, • resting on the support substrate and arranged facing the reflective layer, and extending along a longitudinal axis Δ substantially orthogonal to the plane of the support substrate; • comprising a single-photon emitter; • forming a monomode waveguide for the single photons; and • having transverse dimensions that vary longitudinally in the direction of an upper end (20.2) of the photonic wire, so as to form a mode adapter for a guided optical mode; • resting on the support substrate and arranged facing the reflective layer, and extending along a longitudinal axis Δ substantially orthogonal to the plane of the support substrate; • comprising a single-photon emitter; • forming a monomode waveguide for the single photons; and • having transverse dimensions that vary longitudinally in the direction of an upper end (20.2) of the photonic wire, so as to form a mode adapter for a guided optical mode; ∘ an optical excitation device designed to excite the emitter through a laser pulse, and thus to cause the spontaneous emission of single photons by the emitter; ∘ characterized in that the photonic wire is formed of two coaxial parts that are separate and spaced from one another along the longitudinal axis Δ; • a lower part, resting in contact with the support substrate, in which the emitter is arranged, • an upper part, suspended above the lower part and optically coupled thereto, • a lower part, resting in contact with the support substrate, in which the emitter is arranged, • an upper part, suspended above the lower part and optically coupled thereto, ∘ and in that the single-photon source furthermore comprises a holding structure, comprising: • at least one pillar resting in contact with the support substrate and arranged adjacent to the photonic wire, and • at least one holding arm mechanically connecting the upper part to the pillar and holding the upper part suspended above the lower part. • at least one pillar resting in contact with the support substrate and arranged adjacent to the photonic wire, and • at least one holding arm mechanically connecting the upper part to the pillar and holding the upper part suspended above the lower part.