Abstract: A detection system includes a superconducting detector having a plurality of nanowire sensors configured to operate simultaneously. The nanowire sensors are adapted to transmit respective signals upon detection of one or more photons. A controller is adapted to receive the respective signals transmitted by the plurality of nanowire sensors. The controller is adapted to designate an initial signal as indicating a real event, the initial signal being above a predefined amplitude. The controller is adapted to implement a crosstalk rejection sequence, including accepting the respective signals received within a threshold time after the real event during an acceptance window, via a gating unit, and rejecting the respective signals after the threshold time for a specified rejection window, via the gating unit. The crosstalk rejection sequence is repeated for subsequent designations of real events to achieve a desired rate of event rejection.

Abstract: A thermal and environmental noise suppressing interface circuit which is configured to operate cold and is configured to perform biasing with suppression of noise currents from room temperature noise voltages and dc coupled rf readout of a superconducting device under test with a single coaxial cable or equivalent conductor pair. The circuit is configured to suppress the propagation of thermal and environmental noises to/from sensors operating at a different temperature from its operating and control equipment while maintaining a single input-output channel, and provides for the placement of a local grounding impedance on an intercept board.