Tailoring fusion-based photonic quantum computing schemes to quantum emitters

TL;DR

This paper proposes fusion-based photonic quantum computing architectures optimized for quantum emitters, demonstrating high error tolerance and fault-tolerance thresholds suitable for scalable, fault-tolerant quantum hardware.

Contribution

It introduces tailored fusion-based architectures for quantum emitters, analyzing their error thresholds and providing design guidelines for fault-tolerant photonic quantum computing.

Findings

Fault-tolerance threshold of 8% for photon loss

Photon distinguishability threshold of 4%

Spin noise thresholds above memory-induced errors

Abstract

Fusion-based quantum computation is a promising quantum computing model where small-sized photonic resource states are simultaneously entangled and measured by fusion gates. Such operations can be readily implemented with scalable photonic hardware: resource states can be deterministically generated by quantum emitters and fusions require only shallow linear-optical circuits. Here, we propose fusion-based architectures tailored to the capabilities and noise models in quantum emitters. We show that high tolerance to dominant physical error mechanisms can be achieved, with fault-tolerance thresholds of 8% for photon loss, 4% for photon distinguishability between emitters, and spin noise thresholds well above memory-induced errors for typical spin-photon interfaces. Our construction and analysis provide guidelines for the development of photonic quantum hardware targeting fault-tolerant applications with quantum emitters.