Abstract: There is provided a MOMS sensor comprising a fiber interface comprising a fiber passthrough for one or more optical fibers, a cavity comprising an element hermetically encapsulated within the cavity, wherein the element is movably anchored by SiN arms, which are movable with respect to walls of the cavity, wherein the SiN arms comprise anchor portions at first ends of the SiN arms, which are connected to the element, and at second ends of the SiN arms, which are connected to the walls of the cavity, and the fiber interface is configured to receive the fibers through the fiber passthrough into positions for communications of light between the element and the fibers. In this way a robust structure that supports sensitivity of the sensor is provided.

Abstract: A quantum processor is provided according to one embodiment of the present invention. The quantum processor uses propagating microwave photons as flying qubits, encoded in a dual-rail configuration. The dual-rail configuration is characterised by the fact that one photon encodes a qubit, and one photon at most is present in a transmission line. The quantum processor comprises single-qubit gates and two-qubit gates for performing state operations on the qubits. The single-qubit gates comprise directional couplers and phase shifters, while the two-qubit gates comprise electronic circuits including LC oscillators and Josephson junctions. The quantum processor further comprises a single microwave photon generation circuit and a microwave photon detector circuit.

Abstract: An apparatus (1) is proposed for providing coupling between at least a first input signal with a first signal frequency, and a second input signal with a second, different signal frequency. The apparatus comprises: a first input port (3); a second input port (5); a first output port (9); a second output port (11); a first waveguide (13); a second waveguide (15), the second waveguide (15) being made of or comprising non-linear material such that a first electromagnetic field generated by a first-waveguide signal in the first waveguide (13) and a second electromagnetic field generated by a second-waveguide signal in the second waveguide (15) are arranged to overlap in the non-linear material; a periodic structure (31, 33); and a phase-matching arrangement (37).

Abstract: A microwave-to-optical photon transducer is provided for generating coupling between a microwave signal (Sin2) and an optical signal (Spi_in1, Spi_out1). The transducer comprises: a first input port; a second input port; a first output port for outputting the optical signal (Spi_out1) and one or more optical sideband signals (Sout1, Sout11, Sout12); a first waveguide disposed between the first input port and the first output port to allow the optical signal (Spi_in1) and the one or more optical sideband signals (Sout1, Sout11, Sout12) to propagate in the first waveguide; a second waveguide connected to the second input port, and extending in the transducer adjacent to the first waveguide to allow the microwave signal (Sin2) to propagate in the second waveguide; a phase-matching arrangement to cause at least the optical signal (Spi_in1) and the microwave signal (Sin2) to be phase-matched or quasi-phase-matched.

Abstract: There is provided a MOMS sensor comprising a fiber interface comprising a fiber passthrough for one or more optical fibers, a cavity comprising an element hermetically encapsulated within the cavity, wherein the element is movably anchored by SiN arms, which are movable with respect to walls of the cavity, wherein the SiN arms comprise anchor portions at first ends of the SiN arms, which are connected to the element, and at second ends of the SiN arms, which are connected to the walls of the cavity, and the fiber interface is configured to receive the fibers through the fiber passthrough into positions for communications of light between the element and the fibers. In this way a robust structure that supports sensitivity of the sensor is provided.

Abstract: A microwave to optical conversion device comprising: a superconducting microwave resonator, and an optical resonator including an electro-optical material, the superconducting microwave resonator and the optical resonator being arranged one with respect to the other so as to be electro-magnetically coupled.