Ucl Business Plc

Imperial College of Science, Technology and Medicine

Imperial College Innovations Limited

Chris Kay

Enrico Salvadori

Neil Alford

Jonathan David Baxendale Breeze

Jonathan Breeze

Juna Sathian

Masing at room temperature is achieved by an apparatus and method that utilize a microwave cavity which exhibits a resonance of sufficiently high Q-factor for maser oscillation, and a resonator structure comprising a masing medium located within a resonant element. The masing medium comprises spin-defect centres. The resonator structure is disposed within the microwave cavity. A magnetic field is applied across the masing medium. An input of microwave radiation to be amplified is coupled to the resonator structure. An optical pump pumps the masing medium, thereby causing stimulated emission of microwave photons. The microwave cavity has an effective magnetic mode volume matching the volume of the masing medium.

Room temperature masing using spin-defect centres

Apparatus and method establish quantum oscillations at room temperature. A cavity has therein a resonator structure that includes a resonant element and a gain medium. A species of the gain medium has an electronic spin multiplicity capable of supporting a two-level spin system. An optical pump pumps the resonator structure and thereby generates microwave output power through stimulated emission of thermal photons. The species of the gain medium is of a sufficiently high concentration such as to have an ensemble spin-photon coupling rate which exceeds both the cavity mode decay rate and the spin-spin decoherence rate. The optical pump pumps the resonator structure using a short pulse of nanosecond duration, or a burst of approximately a millisecond in duration at relatively low instantaneous optical power, to excite said species of the gain medium into a spin-polarized two-level system that exhibits quantum oscillations in the microwave output power.

Apparatus and method for establishing quantum oscillations

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Chris Kay