Quantum estimation of relative information

Details Quantum estimation of relative information Quantum estimation of relative information

2005-06-27

arxiv.org/abs/quant-ph/0506223v2

Int. J. Quant. Info. 4, 131 (2006)

Physics

Quantum Physics

Contribution to the Int. J. of Quant. Info. issue dedicated to the memory of Asher Peres

Scientific paper

We derive optimal schemes for preparation and estimation of relational degrees of freedom between two quantum systems. We specifically analyze the case of rotation parameters representing relative angles between elements of the SU(2) symmetry group. Our estimation procedure does not assume prior knowledge of the absolute spatial orientation of the systems and as such does not require information on the underlying classical reference frame in which the states are prepared.

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