Volume 65, Number 2, January 2004
|Page(s)||165 - 171|
|Published online||01 January 2004|
Quantum universal detectors
Quantum Optics & Information Group, Unità INFM and Dipartimento di Fisica “A. Volta”, Università di Pavia via A. Bassi 6, I-27100 Pavia, Italy
Accepted: 18 November 2003
We address the problem of achieving a universal measuring apparatus that allows to estimate the expectation value of any arbitrary operator by changing only the data processing of the outcomes. The “universal detector” performs a joint measurement on the system and on a suitably prepared ancilla. We characterize such universal detectors, and show how they can be obtained either via Bell measurements or via local measurements and classical communication between system and ancilla.
PACS: 03.65.Ta – Foundations of quantum mechanics; measurement theory / 03.65.Wj – State reconstruction, quantum tomography
© EDP Sciences, 2004
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