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

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

2001-10-17

arxiv.org/abs/quant-ph/0110105v1

Phys. Rev A vol 65 062106 (2002)

Physics

Quantum Physics

2 figs

Scientific paper

10.1103/PhysRevA.65.062106

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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