|
| related topics |
| {states, state, optimal} |
| {group, space, representation} |
| {measurement, state, measurements} |
| {state, states, entangled} |
| {equation, function, exp} |
| {state, phys, rev} |
| {photon, photons, single} |
| {operator, operators, space} |
| {bell, inequality, local} |
| {state, states, coherent} |
| {information, entropy, channel} |
| {entanglement, phys, rev} |
|
Optimization of quantum universal detectors
G. M. D'Ariano, P. Perinotti, M. F. Sacchi
abstract: The expectation value of an arbitrary operator O can be obtained via a
universal measuring apparatus that is independent of O, by changing only the
data-processing of the outcomes. Such a ``universal detector'' performs a joint
measurement on the system and on a suitable ancilla prepared in a fixed state,
and is equivalent to a positive operator valued measure (POVM) for the system
that is ``informationally complete''. The data processing functions generally
are not unique, and we pose the problem of their optimization, providing some
examples for covariant POVM's, in particular for SU(d) covariance group.
- oai_identifier:
- oai:arXiv.org:quant-ph/0309161
- categories:
- quant-ph
- comments:
- 8 pages, no figures. Proceedingsof the 8th International Conference
on Squeezed States and Uncertainty Relations ICSSUR' 2003, Puebla, Mexico -
June 9-13, 2003
- arxiv_id:
- quant-ph/0309161
- journal_ref:
- in "Proceedings of the 8th Int. Conf. on Squeezed States and
Uncertainty Relations", ed. by H. Moya-Cessa et al., (Rinton, Princeton,
2003) p. 86
- created:
- 2003-09-22
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