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| related topics |
| {information, entropy, channel} |
| {time, decoherence, evolution} |
| {states, state, optimal} |
| {observables, space, algebra} |
| {measurement, state, measurements} |
| {wave, scattering, interference} |
| {cavity, atom, atoms} |
| {error, code, errors} |
| {photon, photons, single} |
| {light, field, probe} |
| {group, space, representation} |
| {classical, space, random} |
| {alice, bob, state} |
| {particle, mechanics, theory} |
|
Quantum erasure of decoherence
F. Buscemi, G. Chiribella, G. M. D'Ariano
abstract: We consider the classical algebra of observables that are diagonal in a given
orthonormal basis, and define a complete decoherence process as a completely
positive map that asymptotically converts any quantum observable into a
diagonal one, while preserving the elements of the classical algebra. For
quantum systems in dimension two and three any decoherence process can be
undone by collecting classical information from the environment and using such
an information to restore the initial system state. As a relevant example, we
illustrate the quantum eraser of Scully et al. [Nature 351, 111 (1991)] as an
example of environment-assisted correction. Moreover, we present the
generalization of the eraser setup for d-dimensional systems, showing that any
von Neumann measurement on a system can be undone by a complementary
measurement on the environment.
- oai_identifier:
- oai:arXiv.org:quant-ph/0611070
- categories:
- quant-ph
- comments:
- 10 pages, 1 figure
- doi:
- 10.1007/s11080-007-9028-4
- arxiv_id:
- quant-ph/0611070
- journal_ref:
- Open Sys. & Information Dyn. 14, 53 (2007)
- created:
- 2006-11-07
Full article ▸
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