Abstract: Systems and methods provide protection of a quantum state of a client quantum system of a broker-client system. The client-broker system comprises the client quantum system and a broker quantum system coupled by an anisotropic hyperfine interaction. The method comprises applying a magnetic field having an orientation and magnitude selected to suppress the hyperfine interaction. While the hyperfine interaction is suppressed, a quantum state of the broker quantum system may be altered by steps including optically exciting the broker quantum system. The method may be applied to reduce decoherence of the quantum state of the client quantum system while generating entanglement of the broker quantum system with other quantum systems.

Abstract: Methods and apparatus for storing and transducing quantum information provide a luminescent center in silicon controllably coupled to undergo quantum interactions with a first qubit such as a superconducting qubit. The luminescent center may be a T center or an ensemble of T centers, for example. The same or different quantum information may be stored in an unpaired electron or hole spin, and/or one or more of three nuclear spins of the T center. The stored quantum information may be later returned to the first qubit or transferred to an optical photon state.

Abstract: Information processing systems, devices, articles and methods are configured for receiving a first photon at a first switch including a first region of semiconductor material, and a first local defect disposed in the first region of semiconductor material. The first local defect has a first defect computational state. Based on, at least, the first defect computational state of the first local defect, a second photon is directed to travel by a first output path communicatively coupled to the first local defect, or a second output path communicatively coupled to the first local defect.

Abstract: Various systems, devices, articles and methods apply one or more luminescent defects disposed within a semiconductor body. A respective luminescent defect included in the one or more luminescent defects has a plurality of orbital states. An information processing device including a semiconductor body and one or more luminescent defects. A system including at least one processor and a quantum information processor comprising at least one luminescent defect. Methods for operation of devices and systems including one or more luminescent defects.

Abstract: Various systems, devices, articles and methods related to one or more local luminescent defects disposed within semiconductor body including silicon. A respective defect included in the one or more defects supports a respective bound exciton. A respective pair of computational states is defined at the respective defect and one computational state of the pair of computational states includes a first configuration for the respective exciton. Information stored in the respective pair of computational states can be manipulated according to various systems, devices, articles and methods described herein.

Abstract: A quantum information processing device including a semiconductor substrate. An optical resonator is coupled to the substrate. The optical resonator supports a first photonic mode with a first resonator frequency. The quantum information processing device includes a non-gaseous chalcogen donor atom disposed within the semiconductor substrate and optically coupled to the optical resonator. The donor atom has a transition frequency in resonance with the resonator frequency. Also disclosed herein are systems, devices, articles and methods with practical application in quantum information processing including or associated with one or more deep impurities in a silicon substrate optically coupled to an optical structure.

Abstract: A quantum information processing device including a semiconductor substrate. An optical resonator is coupled to the substrate. The optical resonator supports a first photonic mode with a first resonator frequency. The quantum information processing device includes a non-gaseous chalcogen donor atom disposed within the semiconductor substrate and optically coupled to the optical resonator. The donor atom has a transition frequency in resonance with the resonator frequency. Also disclosed herein are systems, devices, articles and methods with practical application in quantum information processing including or associated with one or more deep impurities in a silicon substrate optically coupled to an optical structure.

Abstract: A device, such as, an information processing or communications device, including a body of semiconductor material consisting principally of silicon, one or more luminescence centres disposed in the body of semiconductor material, one or more optical degrees of freedom associated with the one or more luminescence centres, and one or more local degrees of freedom associated with the one or more luminescence centres. A respective optical degree of freedom is associated with a respective luminescence centre. A respective local degree of freedom is associated with a respective luminescence centre. The one or more local degrees of freedom modify the one or more optical degrees of freedom.

Abstract: A quantum information processing device including a semiconductor substrate. An optical resonator is coupled to the substrate. The optical resonator supports a first photonic mode with a first resonator frequency. The quantum information processing device includes a non-gaseous chalcogen donor atom disposed within the semiconductor substrate and optically coupled to the optical resonator. The donor atom has a transition frequency in resonance with the resonator frequency. Also disclosed herein are systems, devices, articles and methods with practical application in quantum information processing including or associated with one or more deep impurities in a silicon substrate optically coupled to an optical structure.

Abstract: A liquid chemical formulation suitable for making a thin solid polycarbonate film contains polycarbonate material and a liquid typically capable of dissolving the polycarbonate material to a concentration of at least 1%. The polycarbonate material may consist of homopolycarbonate or/and copolycarbonate. Examples of the liquid include pyridine, a ring-substituted pyridine derivative, pyrrole, a ring-substituted pyrrole derivative, pyrrolidine, a pyrrolidine derativive, chlorobenzene, and cyclohexanone. A liquid film (36A) of the formulation is formed over a substructure (30) and processed to remove the liquid. The resultant solid polycarbonate film can later serve as a track layer through which charged particles (70) are passed to form charged-particle tracks (72). Apertures (74) are created through the track layer by a process that entails etching along the tracks. The aperture-containing polycarbonate track layer is typically used in fabricating a gated electron-emitting device.