Multiple junction biasing of superconducting tunnel junction detectors

TL;DR

This paper introduces a novel biasing scheme for superconducting tunnel junction photon detectors using a three-junction circuit, eliminating the need for external magnetic fields and enhancing detector array scalability.

Contribution

It proposes a new three-junction biasing method that stabilizes the detector at subgap currents without external magnetic fields, improving scalability and fabrication.

Findings

Numerical simulation confirms stable nonlinear biasing state.

The scheme is compatible with high-fidelity electrical readout.

Eliminates the need for external magnetic fields.

Abstract

We describe a new biasing scheme for single photon detectors based on superconducting tunnel junctions. It replaces a single detector junction with a circuit of three junctions and achieves biasing of a detector junction at subgap currents without the use of an external magnetic field. The biasing occurs through the nonlinear interaction of the three junctions, which we demonstrate through numerical simulation. This nonlinear state is numerically stable against external fluctuations and is compatible with high fidelity electrical readout of the photon-induced current. The elimination of the external magnetic field potentially increases the capability of these types of photon detectors and eases constraints involved in the fabrication of large detector arrays.