Single quantum emitter single photon source and producing a single photon stream

A single quantum emitter single photon source for producing a single photon stream, the single quantum emitter single photon source comprising:

• a single-mode excitation waveguide that receives a pump light, propagates pump light as resonant excitation light, and produces evanescent excitation light from resonant excitation light;
• a separation gap that separates the single-mode excitation waveguide and a multi-mode intermediate waveguide and that receives the evanescent excitation light from the single-mode excitation waveguide;
• the multi-mode intermediate waveguide in evanescent communication with the single-mode excitation waveguide and that:
• comprises a single quantum emitter disposed in the multi-mode intermediate waveguide,
• evanescently receives the evanescent excitation light from the single-mode excitation waveguide across the separation gap,
• propagates the evanescent excitation light as resonant excitation light, and
• subjects the single quantum emitter to the resonant excitation light such that the single quantum emitter produces emitted single photons from the resonant excitation light;
• an adiabatic mode transformer that separates the multi-mode intermediate waveguide and a single-mode output waveguide and that:
• is in optical communication with the multi-mode intermediate waveguide,
• receives the emitted single photons from the multi-mode intermediate waveguide, and
• optically couples the multi-mode intermediate waveguide and the single-mode output waveguide;
• and
• the single-mode output waveguide in optical communication with the adiabatic mode transformer and that:
• receives the emitted single photons from the adiabatic mode transformer, and
• propagates the emitted single photons as emitted single photon stream.

A process for producing a single photon stream with a single quantum emitter single photon source, the process comprising:

• producing a pump light;
• receiving, by a single-mode excitation waveguide, the pump light;
• propagating the pump light as resonant excitation light in the single-mode excitation waveguide;
• producing evanescent excitation light from the resonant excitation light;
• receiving the evanescent excitation light in a separation gap that separates the single-mode excitation waveguide from a multi-mode intermediate waveguide;
• propagating the evanescent excitation light through the separation gap;
• evanescently receiving, by the multi-mode intermediate waveguide, the evanescent excitation light from the single-mode excitation waveguide through the separation gap;
• propagating the evanescent excitation light as resonant excitation light through the multi-mode intermediate waveguide;
• subjecting a single quantum emitter disposed in the multi-mode intermediate waveguide to the resonant excitation light;
• producing, by the single quantum emitter, emitted single photons from the resonant excitation light;
• propagating the emitted single photons through the multi-mode intermediate waveguide;
• communicating the emitted single photons from the multi-mode intermediate waveguide to a single-mode output waveguide;
• receiving, by the single-mode output waveguide, the emitted single photons from the multi-mode intermediate waveguide;
• and
• propagating, through the single-mode output waveguide, the emitted single photons at emitted single photon stream to produce the emitted single photon stream.