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Pré-Publication, Document De Travail Année : 2024

Saturating a Fundamental Bound on Quantum Measurements' Accuracy

Résumé

A quantum system is usually measured through observations performed on a second quantum system, or meter, to which it is coupled. In this scenario, fundamental limitations arise as stated by the celebrated Wigner-Araki-Yanase theorem and its generalizations, predicting an upper-bound on the measurement's accuracy (Ozawa's bound). Here, we show it is possible to saturate this fundamental bound. We propose a simple interferometric setup, arguably within reach of present technology, in which a flying particle (the quantum meter) is used to measure the state of a qubit (the target system). We show that the bound can be saturated and that this happens only if the flying particle is prepared in a Gaussian wavepacket.

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Dates et versions

hal-04565734 , version 1 (02-05-2024)

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Nicolò Piccione, Maria Maffei, Andrew N Jordan, Kater W Murch, Alexia Auffèves. Saturating a Fundamental Bound on Quantum Measurements' Accuracy. 2024. ⟨hal-04565734⟩
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