Abstract: A method includes generating a bias signal from a first device, and applying the bias signal to a second device, the first device having (a) a superconducting trace and (b) a superconducting quantum interference device (SQUID), in which a first terminal of the SQUID is electrically coupled to a first end of the superconducting trace, and a second terminal of the SQUID is electrically coupled to a second end of the superconducting trace, where generating the bias signal from the first device includes: applying a first signal ?1 to a first sub-loop of the SQUID; and applying a second signal ?2 to a second sub-loop of the SQUID, in which the first signal ?1 and the second signal ?2 are applied such that a value of a superconducting phase of the first device is incremented or decremented by a non-zero integer multiple n of 2?.

Abstract: Methods and apparatus for estimating the fidelity of quantum hardware. In one aspect, a method includes accessing a set of quantum gates; sampling a subset of quantum gates from the set of quantum gates, wherein the subset of quantum gates defines a quantum circuit; applying the quantum circuit to a quantum system and performing measurements on the quantum system to determine output information of the quantum system; calculating output information of the quantum system based on application of the quantum circuit to the quantum system; and estimating a fidelity of the quantum circuit based on the determined output information and the calculated output information of the quantum system.

Abstract: A method includes generating a bias signal from a first device, and applying the bias signal to a second device, the first device having (a) a superconducting trace and (b) a superconducting quantum interference device (SQUID), in which a first terminal of the SQUID is electrically coupled to a first end of the superconducting trace, and a second terminal of the SQUID is electrically coupled to a second end of the superconducting trace, where generating the bias signal from the first device includes: applying a first signal ?1 to a first sub-loop of the SQUID; and applying a second signal ?2 to a second sub-loop of the SQUID, in which the first signal ?1 and the second signal ?2 are applied such that a value of a superconducting phase of the first device is incremented or decremented by a non-zero integer multiple n of 2?.

Abstract: A qubit device includes an elongated thin film uninterrupted by Josephson junctions, a quantum device in electrical contact with a proximal end of the elongated thin film, and a ground plane that is co-planar with the elongated thin film and is in electrical contact with a distal end of the elongated thin film, in which the thin film, the quantum device, and the ground plane comprise a material that is superconducting at a designed operating temperature.

Abstract: A system and method for using one or more localized weak-link structures, and damping on the electrical bias circuit, to improve the performance of superconducting transition-edge sensors (TES). The weak links generally consist of an area or areas having a reduction in cross-sectional geometry in an otherwise uniform bilayer TES applied to a substrate. The weak links control the dissipation of power in the sensor, making it quieter and making its electrical response smoother and less hysteretic. The TES response is also made smoother by implementing a damping circuit on the electrical output of the TES.

Abstract: A composite door with a lite utilizes panels with aligned cutouts and a foam retainer member which extends about the cutouts between the panels to effect a seal. The retainer has a mounting portion extending inwardly from the cutout periphery. The lite is disposed in the cutout and it is secured by an external frame which has portions overlying the outer surface of the panel and its marginal portion. A clamp secured to the foam retainer and external frame and clamps the lite to the external frame, and an internal frame has portions overlying the outer surface of the other panel and the marginal portion of the other surface of the lite and conceals the clamp and fastener.

Abstract: A method for the assembly of doors having a pair of skins and a core of synthetic resin forms a first door element including forming a first skin and a peripheral wall to provide an upwardly opening cavity into which a foamable synthetic resin formulation is introduced. A second skin is then assembled over the cavity, and the resultant door assembly is passed through an elongated heating zone while controlling the thickness dimension of the door assembly to expand and cure the resin formulation in the cavity into a cellular resin insulating core and to bond the skins and core. The several steps are conducted seriatim at stations along a conveyor assembly.

Abstract: A detector of X-ray and the like in which very good resolution of energy can be obtained. The device is based on two basic components. The first is the x-ray absorber in which an x-ray interacts with a film and converts its energy into heat. Because the absorber is operated at cryogenic temperatures, approximately the range of 0.01 Kelvin to 1 Kelvin, its heat capacity is small and causes a measurable temperature rise. The second component of the invention is a base layer of normal metal which absorbs the heat generated by the x-ray. The third component of the invention is the method to detect the temperature rise. This thermometer is based on a normal metal-insulator-superconductor tunnel junction, where part of the base layer is the normal metal. When the tunnel junction is electrically biased at a voltage slightly below the gap voltage of the superconductor, the electrical current that flows through the junction is sensitively dependent on the temperature of the normal metal.