Efficient Bell state analyzer for time-bin qubits with fast-recovery WSi superconducting single photon detectors

TL;DR

This paper presents a high-efficiency Bell state measurement for time-bin qubits using fast-recovery superconducting detectors, significantly improving analysis efficiency over previous methods.

Contribution

The work introduces a novel implementation employing superconducting nanowire detectors with short dead-times to enhance Bell state analysis efficiency for time-bin qubits.

Findings

Achieved projection onto two Bell states, |Psi>- and |Psi+>

Increased Bell state analysis efficiency by a factor of thirty

Demonstrated practical application with superconducting nanowire detectors

Abstract

We experimentally demonstrate a high-efficiency Bell state measurement for time-bin qubits that employs two superconducting nanowire single-photon detectors with short dead-times, allowing projections onto two Bell states, |Psi>- and |Psi+>. Compared to previous implementations for time-bin qubits, this yields an increase in the efficiency of Bell state analysis by a factor of thirty.