Optimal measurements for relative quantum information

Details Optimal measurements for relative quantum information Optimal measurements for relative quantum information

2003-10-02

arxiv.org/abs/quant-ph/0310009v3

Phys. Rev. A 70, 032321 (2004)

Physics

Quantum Physics

6 pages, 1 figure, published version

Scientific paper

10.1103/PhysRevA.70.032321

We provide optimal measurement schemes for estimating relative parameters of the quantum state of a pair of spin systems. We prove that the optimal measurements are joint measurements on the pair of systems, meaning that they cannot be achieved by local operations and classical communication. We also demonstrate that in the limit where one of the spins becomes macroscopic, our results reproduce those that are obtained by treating that spin as a classical reference direction.

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