Experimental benchmarking of quantum state overlap estimation strategies with photonic systems.

ABSTRACT: Accurately estimating the overlap between quantum states is a fundamental task in quantum information processing. While various strategies using distinct quantum measurements have been proposed for overlap estimation, the lack of experimental benchmarks on estimation precision limits strategy selection in different situations. Here we compare the performance of four practical strategies for overlap estimation, including tomography-tomography, tomography-projection, Schur collective measurement and optical swap test using photonic quantum systems. We encode the quantum states on the polarization and path degrees of freedom of single photons. The corresponding measurements are performed by photon detection on certain modes following single-photon mode transformation or two-photon interferenc

SUBMITTER: Zhan H 

PROVIDER: S-EPMC11814415 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature