Lossy SU(1,1) interferometers in the single-photon-pair regime

TL;DR

This paper investigates the performance of quantum SU(1,1) interferometers with single-photon pairs under realistic loss conditions, demonstrating their potential to outperform classical systems in practical sensing applications.

Contribution

It introduces the use of coincidence measurement to mitigate losses and shows quantum SU(1,1) interferometers can surpass classical SU(2) systems in real-world scenarios.

Findings

Coincidence measurement partially mitigates loss effects.

Quantum SU(1,1) interferometers outperform classical SU(2) systems under realistic conditions.

Potential for practical quantum sensing applications.

Abstract

The success of quantum technologies is intimately connected to the possibility of using them in real-world applications. To this aim, we study the sensing capabilities of quantum SU(1,1) interferometers in the single-photon-pair regime and in the presence of losses, a situation highly relevant to practical realistic measurements of extremely photosensitive materials. We show that coincidence measurement can be exploited to partially mitigate the effect of losses inside the interferometer. Finally, we find that quantum SU(1,1) interferometers are capable of outperforming classical SU(2) systems when analogous real-world conditions are considered.