Work

Ultimate quantum sensitivity in the 3D relative localisation of two single-photon emitters via two-photon interference

Year: 2026

Type: article

Abstract: We present a quantum sensing protocol for the simultaneous estimation of the difference in the localization parameters of two single-photon sources, paving the way to single-photon 3D imaging and 3D nanoscopy beyond the diffraction limit. This is achieved by exploiting two-photon interference of the two emitted photons at a beam splitter via sampling measurements in the frequency and transverse momenta at the output. We prove theoretically that this technique reaches the ultimate sensitivity in the 3D relative localization of two emitters, already with a number of sampling measurements of $$\sim 2000$$ ∼ 2000 and a bias in the three localization parameters below $$1\%$$ 1 % . These results are independent of the values of the localization parameters to estimate.

Source: The European Physical Journal Plus

DOI: 10.1140/epjp/s13360-025-07257-1

Authors: Luca Maggio, Vincenzo Tamma

Institution: University of Portsmouth

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,890

Funder: Air Force Office of Scientific Research