Id Quantique Sa

Universitè De Genève

Id Quantique

Félix Bussières

Gaëtan Gras

Bruno Sanguinetti

Gianluca Boso

Sylvain Chuard

Boris Korzh

Misael Caloz

Matthieu Perrenoud

A device for single-photon detection comprising two superconducting detectors, a bias-current source, a filter element and a readout circuit. Each detector forms a detection area for absorption of incident photons and is connected in parallel; each detector being maintained below its critical temperature and provided with an electrical bias current situated close to and below its critical current so as to be maintained in a non-resistive superconducting state, and configured to transition, at photon absorption, from the non-resistive state to a resistive state due to an increase in current density within the detector above the critical current. The readout circuit senses a voltage change corresponding to the, allowing creation of an event signal for each absorption of an incident photon by a detector. The device includes a current-redistribution portion for redistributing current arising after absorption of incident photons so as to avoid increases in current density above the critical current.

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

A receiver for recognizes blinding attacks in a quantum encrypted channel having an optical fiber. The receiver includes a multipixel detector having a plurality of pixels, and configured to be illuminated by a light beam outputted by the optical fiber. A processing unit connects to the multipixel detector and is configured to determine the presence of a blinding attack if a predetermined number of pixels detects light within a predetermined interval. The receiver recognizes blinding attacks in a quantum encrypted channel and implements a method for recognizing blinding attacks in a quantum encrypted channel.

Method and device for recognizing blinding attacks in a quantum encrypted channel

The present invention relates to a receiver () for recognizing blinding attacks in a quantum encrypted channel () comprising an optical fiber, comprising a multipixel detector () comprising a plurality of pixels, and configured to be illuminated by a light beam outputted by the optical fiber, and a processing unit () connected to the multipixel detector () and configured to determine the presence of a blinding attack if a predetermined number of pixels detects light within a predetermined interval. The invention further relates to the use of the receiver () for recognizing blinding attacks in a quantum encrypted channel () and to a method for recognizing blinding attacks in a quantum encrypted channel ().

The present invention relates to a measuring device () for measuring reflection in an optical fiber (), the device comprising: emitting means () connected to the optical fiber () and configured to emit light into the optical fiber (), measuring means () connected to the optical fiber () and configured to receive a reflected light from the optical fiber (), wherein the measuring means comprises a first photon detector () and a second photon detector (), wherein the operation of the second photon detector () and/or the reflected light reaching the second photon detector () is controlled based on an output of the first photon detector ().

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Vessy, Switzerland

Félix Bussières