A high-fidelity noiseless amplifier for quantum light states

TL;DR

This paper reports the experimental realization of a probabilistic noiseless linear amplifier for quantum light states, achieving unprecedented gain and fidelity, which could significantly improve quantum communication and measurement techniques.

Contribution

The authors demonstrate a high-fidelity, probabilistic noiseless amplifier using photon addition and subtraction, surpassing previous amplification performance in quantum optics.

Findings

Achieved the highest effective gain and fidelity in noiseless quantum amplification.

Demonstrated significant amplification with low distortions.

Potential applications in quantum communication and metrology.

Abstract

Noise is the price to pay when trying to clone or amplify arbitrary quantum states. The quantum noise associated to linear phase-insensitive amplifiers can only be avoided by relaxing the requirement of a deterministic operation. Here we present the experimental realization of a probabilistic noiseless linear amplifier that is able to amplify coherent states at the highest level of effective gain and final state fidelity ever reached. Based on a sequence of photon addition and subtraction, and characterized by a significant amplification and low distortions, this high-fidelity amplification scheme may become an essential tool for quantum communications and metrology, by enhancing the discrimination between partially overlapping quantum states or by recovering the information transmitted over lossy channels.