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 . <EOS>