Improving quantum interferometry by using entanglement (to take a decision you'd better use entanglement)

Abstract

We address the use of entanglement to improve the precision of generalized quantum interferometry, i.e. of binary measurements aimed to determine whether or not a perturbation has been applied by a given device. For the most relevant operations in quantum optics, we evaluate the optimal detection strategy and the ultimate bounds to the minimum detectable perturbation. Our results indicate that entanglement-assisted strategies improve the discrimination in comparison with conventional schemes. A concrete setup to approach performances of the optimal strategies is also suggested.

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References in corpus (2)

• Using entanglement improves precision of quantum measurements
• Optimal quantum estimation of the coupling between two bosonic modes

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