NOON states from cavity-enhanced down-conversion: High quality and super-resolution

TL;DR

This paper demonstrates the generation of high-fidelity polarization NOON states from a cavity-enhanced down-conversion source, enabling super-resolution measurements with high visibility, crucial for quantum optical technologies.

Contribution

It introduces a method to produce high-quality NOON states with 99% fidelity and applies them to super-resolution angular measurements.

Findings

Generated NOON states with 99% fidelity.

Achieved super-resolution with 90% visibility.

Characterized photon indistinguishability and decoherence.

Abstract

Indistinguishable photons play a key role in quantum optical information technologies. We characterize the output of an ultra-bright photon-pair source using multi-particle tomography [R. B. A. Adamson et al., Phys. Rev. Lett. 98, 043601 (2007)] and separately identify coherent errors, decoherence, and distinguishability. We demonstrate generation of high-quality indistinguishable pairs and polarization NOON states with 99% fidelity to an ideal NOON state. Using a NOON state we perform a super-resolving angular measurement with 90% visibility.