Journal
PHYSICAL REVIEW LETTERS
Volume 87, Issue 27, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.87.270404
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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.
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