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Using entanglement improves the precision of quantum measurements
G M D'Ariano1, P Lo Presti, M G Paris
1Quantum Optics & Information Group, Istituto Nazionale di Fisica della Materia, Dipartimento di Fisica A. Volta, Università di Pavia, via Bassi 6, I-27100 Pavia, Italy. dariano@unipv.it
Physical Review Letters
|January 22, 2002
Abstract:
We show how entanglement can be used to improve the estimation of an unknown transformation. Using entanglement is always of benefit in improving either the precision or the stability of the measurement. Examples relevant for applications are illustrated, for either qubits or continuous variables.