Year: 2004
Type: article
Abstract: 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.
Source: Europhysics Letters (EPL)
Authors: G. M D'Ariano, P Perinotti, M. F Sacchi
Institution: University of Pavia
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Award: G6340028498
OpenAlex ID: W2103810959