Entanglement enabled telescopic arrays in the presence of decoherence

TL;DR

This paper proposes a quantum-enhanced interferometric measurement protocol using imperfect entanglement to improve telescope resolution, demonstrating its practical feasibility despite decoherence effects.

Contribution

It introduces a novel protocol for quantum-enhanced telescopic imaging that accounts for imperfect entanglement and analyzes its robustness against decoherence.

Findings

Errors in visibility measurement are manageable with realistic entanglement levels.

The protocol maintains small measurement errors over a wide range of entanglement qualities.

Quantum enhancement can be practically implemented in telescopic arrays despite decoherence.

Abstract

We consider quantum enhancement of direct-detection interferometric measurements to increase telescope resolution. We propose a protocol of measuring interferometric visibility function using imperfectly entangled states shared between remote telescopes. We show how errors in visibility measurement, and in turn, errors in intensity distribution of a distant object depend on the degree of entanglement of the shared quantum resource. We determine that these errors are sufficiently small over a wide range of resource states which makes our technique feasible in practical environments.