Experimental demonstration of superresolution of partially coherent light sources using parity sorting

TL;DR

This paper demonstrates both theoretically and experimentally that partial coherence can enhance the superresolution localization of light sources using parity sorting, advancing quantum metrology techniques.

Contribution

It introduces the first experimental validation of superresolution with partially coherent sources using parity sorting, highlighting the role of coherence in quantum metrology.

Findings

Higher Fisher information with partial coherence compared to incoherent sources.

Experimental confirmation of superresolution capabilities.

Clarification of coherence's role in quantum-limited localization.

Abstract

Analyses based on quantum metrology have shown that the ability to localize the positions of two incoherent point sources can be significantly enhanced through the use of mode sorting. Here we theoretically and experimentally investigate the effect of partial coherence on the sub-diffraction limit localization of two sources based on parity sorting. With the prior information of a negative and real-valued degree of coherence, higher Fisher information is obtained than that for the incoherent case. Our results pave the way to clarifying the role of coherence in quantum limited metrology.