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Quantum estimation of relative information

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arxiv quant-ph/0506223 v2 pith:BUYJ7W7V submitted 2005-06-27 quant-ph

Quantum estimation of relative information

classification quant-ph
keywords estimationinformationquantumrelativesystemsabsoluteanalyzeangles
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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