Quantum universal detectors

Details Quantum universal detectors Quantum universal detectors

2003-06-04

arxiv.org/abs/quant-ph/0306025v1

Europhys. Lett. 65, 165 (2004)

Physics

Quantum Physics

4 pages, no figures

Scientific paper

10.1209/epl/i2003-10079-1

We address the problem of estimating the expectation value of an arbitrary operator O via a universal measuring apparatus that is independent of O, and for which the expectation values for different operators are obtained by changing only the data-processing. 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.

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