Science and Nature

Josephson junction infrared single-photon detector

A junction for single-photon detection

Josephson junctions are easy superconducting devices comprising an insulator or semiconductor keeping apart two superconducting regions. They design the workhorse of superconducting applied sciences and are exquisitely composed to magnetic area. One long-sought proposal has been to consume these devices to detect mild. Walsh et al. have realized a photosensitive Josephson junction according to graphene that is able to sensing single infrared photons. One of these photosensitive Josephson junction is anticipated to characteristic as a excessive-velocity, low-vitality consumption optical interconnect for conversation between superconducting-essentially based supercomputers and quantum computers.

Science, this divulge p. 409


Josephson junctions are superconducting devices outdated as excessive-sensitivity magnetometers and voltage amplifiers as smartly because the premise of excessive-efficiency cryogenic computers and superconducting quantum computers. Despite the fact that instrument efficiency also can moreover be degraded by the know-how of quasiparticles fashioned from broken Cooper pairs, this phenomenon also opens opportunities to sensitively detect electromagnetic radiation. We whisper single shut to-infrared photon detection by coupling photons to the localized ground plasmons of a graphene-essentially based Josephson junction. The consume of the photon-triggered switching statistics of the most up-to-date-biased instrument, we expose the severe role of quasiparticles generated by the absorbed photon within the detection mechanism. The photon sensitivity will enable a excessive-velocity, low-vitality optical interconnect for future superconducting computing architectures.

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