Device and system for single photon detection using plurality of superconducting detection means connected in parallel

Abstract

The present invention concerns a for single photon detection comprising at least two superconducting detection means (1) as well as a bias current source (2), a filter element (3) and a readout circuit (4), wherein each superconducting detection means (1) forms a detection area adapted for absorption of incident photons and is connected in parallel, each superconducting detection means (1) being maintained at a temperature below its critical temperature (TC) and provided with an electrical bias current (IB) situated close to and below its critical current (IC) such as to normally be maintained in a non-resistive superconducting state, and being adapted to transition, at photon absorption, from said non-resistive superconducting state to a resistive state due to an increase in current density within the superconducting detection means (1) above the critical current (IC), said readout circuit (4) being adapted to sense a voltage change corresponding to said transition of the superconducting detection means (1) into its resistive state, such as to allow to create an event signal for each absorption of an incident photon by any of said superconducting detection means (1). The device distinguishes itself by the fact that it further comprises at least one current re-distribution means (5) adapted for at least partly redistributing current arising after absorption of incident photons by any of said superconducting detection means (1) into said current re-distribution means (5), such as to avoid any of the superconducting detection means (1) not having absorbed an incident photon of suffering an increase in current density above its critical current (IC). The present invention also concerns a system for single photon detection comprising at least two such devices.

Description

technical field [0001] The present invention relates to an apparatus for single-photon detection, comprising at least two superconducting detection components and a bias current source, a filter element and a readout circuit, wherein each superconducting detection component is formed suitable for absorbing incident photons and connected in parallel to the bias current source and the readout circuit through the intermediate body of the filter element, each superconducting detection element is maintained at a temperature below its critical temperature, the bias current source Providing each superconducting detection element with a bias current located near and below the critical current of the superconducting detection element, such as to normally maintain each superconducting detection element in a non-resistive superconducting state, each superconducting detection element The component is adapted to transition from the non-resistive superconducting state to its resistive state...

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Problems solved by technology

However, for the same reason, by construction principles, the device according to CN 106 289 515 is not suitable to solve, but rather leads to, the above-mentioned problems associated with current crosstalk

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