Physics – Quantum Physics
Scientific paper
1998-12-15
Phys.Lett. A248 (1998) 103
Physics
Quantum Physics
11 pages. Elsart package used
Scientific paper
10.1016/S0375-9601(98)00702-6
The problem of estimating a generic phase-shift experienced by a quantum
state is addressed for a generally degenerate phase shift operator. The optimal
positive operator-valued measure is derived along with the optimal input state.
Two relevant examples are analyzed: i) a multi-mode phase shift operator for
multipath interferometry; ii) the two mode heterodyne phase detection.
D'Ariano Giacomo M.
Macchiavello Chiara
Sacchi Massimiliano Federico
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