Experimental demonstration of a versatile and scalable scheme for iterative generation of non-Gaussian states of light

TL;DR

This paper presents an experimental method using a quantum memory cavity to efficiently generate non-Gaussian states of light, such as Schrödinger cat states, at high rates, advancing quantum computing capabilities.

Contribution

The authors demonstrate a versatile, scalable scheme for iterative non-Gaussian state generation using a quantum memory cavity, overcoming probabilistic limitations of previous protocols.

Findings

Generated Schrödinger cat states with alpha=1.63 and >60% fidelity

Achieved generation rates in the kHz range, surpassing previous methods

Showed scalability potential for quantum computing applications

Abstract

Non-Gaussian states of light, such as GKP states, are essential resources for optical continuous-variable quantum computing. The ability to efficiently produce these states would open up tremendous prospects for quantum technologies in general and fault-tolerant quantum computing in particular. This letter demonstrates a versatile method using a quantum memory cavity to overcome the probabilistic nature of the breeding protocols and generate non-Gaussian states at high rates with scalability perspectives. The performances of our experimental setup are illustrated with the generation of Schr\"odinger cat states of amplitude alpha = 1.63 with a fidelity of more than 60% at a generation rate in the kHz range, which is higher than the state of the art for such states.