# Graphene-based Josephson junction single photon detector

## TL;DR

This paper proposes a novel graphene-based Josephson junction detector capable of single-photon detection across a broad spectrum, leveraging graphene's low heat capacity and thermal conductance for high sensitivity in quantum and astronomical applications.

## Contribution

It introduces a new detector design using graphene Josephson junctions for broad-spectrum single-photon detection, with feasibility demonstrated through theoretical analysis.

## Key findings

- High sensitivity detection potential across visible to radio frequencies
- Feasibility shown with existing gJj technology parameters
- Predicted low dark count rate and high quantum efficiency

## Abstract

We propose to use graphene-based Josephson junctions (gJjs) to detect single photons in a wide electromagnetic spectrum from visible to radio frequencies. Our approach takes advantage of the exceptionally low electronic heat capacity of monolayer graphene and its constricted thermal conductance to its phonon degrees of freedom. Such a system could provide high sensitivity photon detection required for research areas including quantum information processing and radio-astronomy. As an example, we present our device concepts for gJj single photon detectors in both the microwave and infrared regimes. The dark count rate and intrinsic quantum efficiency are computed based on parameters from a measured gJj, demonstrating feasibility within existing technologies.