Enhanced Resolution of Lossy Interferometry by Coherent Amplification of Single Photons

TL;DR

This paper proposes using optical parametric amplification after sample interaction to enhance phase measurement sensitivity in lossy quantum interferometry, overcoming environmental noise effects.

Contribution

It introduces a novel method of post-interaction amplification to mitigate loss effects in quantum sensing, improving measurement precision.

Findings

Amplification boosts interferometry sensitivity under losses.

Method outperforms traditional single-photon measurements.

Enhances quantum sensing robustness in noisy environments.

Abstract

In the quantum sensing context most of the efforts to design novel quantum techniques of sensing have been constrained to idealized, noise-free scenarios, in which effects of environmental disturbances could be neglected. In this work, we propose to exploit optical parametric amplification to boost interferometry sensitivity in the presence of losses in a minimally invasive scenario. By performing the amplification process on the microscopic probe after the interaction with the sample, we can beat the losses detrimental effect on the phase measurement which affects the single-photon state after its interaction with the sample, and thus improve the achievable sensitivity.