Proximity SQUID Single-Photon Detector via Temperature-to-Voltage Conversion

P. Solinas; F. Giazotto; G. P. Pepe

doi:10.1103/PhysRevApplied.10.024015

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Proximity SQUID Single-Photon Detector via Temperature-to-Voltage Conversion

P. Solinas, F. Giazotto, G. P. Pepe

DOI 10.1103/PhysRevApplied.10.024015 · Physical Review Applied

T1

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Abstract

We propose a single-photon detector based on a superconducting quantum interference device (SQUID) with superconductor–normal-metal–superconductor Josephson weak links. One of the two Josephson junctions is connected to an antenna, and is heated when a photon is absorbed. The increase of the weak-link temperature exponentially suppresses the Josephson critical current, thereby inducing an asymmetry in the SQUID. This generates a voltage pulse across the SQUID that can be measured with a threshold detector. Realized with realistic parameters, the device can be used as a single-photon detector—and as a calorimeter, since it is able to discriminate photon frequencies above 5THz with a signal-to-noise ratio larger than 20. The performance of the detector is robust with respect to working temperatures between 0.1 and 0.5K, and with respect to thermal noise perturbation.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown