Quantum Sensors: Improved Optical Measurement via Specialized Quantum States

TL;DR

This paper reviews advanced quantum measurement techniques using entanglement, orbital angular momentum, and interferometry to surpass classical optical measurement limits, highlighting the potential of quantum states to enhance sensitivity.

Contribution

It introduces and discusses novel quantum strategies for optical measurement that leverage entanglement and quantum states to achieve sensitivities beyond classical limits.

Findings

Quantum entanglement improves measurement precision.

Orbital angular momentum of photons enhances resolution.

Quantum interferometry surpasses classical measurement limits.

Abstract

Classical measurement strategies in many areas are approaching their maximum resolution and sensitivity levels, but these levels often still fall far short of the ultimate limits allowed by the laws of physics. To go further, strategies must be adopted that take into account the quantum nature of the probe particles and that optimize their quantum states for the desired application. Here, we review some of these approaches, in which quantum entanglement, the orbital angular momentum of single photons, and quantum interferometry are used to produce optical measurements beyond the classical limit.