All-optical single-atom photon router controlled by a single photon
AssigneeYeda Research and Development Co. Ltd.
InventorsBarak Dayan, Itay Shomroni, Serge Rosenblum
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Abstract
A switch activated by a single control photon for routing a single target photon from either of two switch inputs to either of two switch outputs. The device is based on a single quantum emitter, such as an atom, coupled to a fiber-coupled, chip-based optical micro-resonator. A single reflected control photon toggles the switch from high reflection to high transmission mode, with no additional control fields required. The control and target photons are both in-fiber and practically identical, for compatibility with scalable architectures for quantum information processing.
Claims20
A device for storing and reading a circular polarization of a photon and for routing a single target photon by a single control photon, the device comprising:
- a waveguide supporting a first electromagnetic mode and a second electromagnetic mode, wherein the first electromagnetic mode is distinct from the second electromagnetic mode, the waveguide coupled to:
- a first input port for a photon;
- a second input port for a photon;
- a first output port for a photon;
- and
- a second output port for a photon;
- wherein the first input port is distinct from the second input port and the first output port is distinct from the second output port:
- a quantum emitter having:
- a first ground state;
- a second ground state;
- an excited state;
- a first transition, between the first ground state and the excited state, the first transition having a first circular polarization;
- and
- a second transition, between the second ground state and the excited state, the second transition having a second circular polarization;
- wherein:
- the first ground state is distinct from the second ground state;
- the first circular polarization is opposite of the second circular polarization;
- the first electromagnetic mode couples to the first transition;
- and the second electromagnetic mode couples to the second transition.
Dependencies are inferred from the claim text.