|
| related topics |
| {states, state, optimal} |
| {information, entropy, channel} |
| {state, states, entangled} |
| {observables, space, algebra} |
| {state, phys, rev} |
| {cos, sin, state} |
| {let, theorem, proof} |
|
Physical Purification of Quantum States
M. Kleinmann, H. Kampermann, T. Meyer, D. Bruss
abstract: We introduce the concept of a physical process that purifies a mixed quantum
state, taken from a set of states, and investigate the conditions under which
such a purification map exists. Here, a purification of a mixed quantum state
is a pure state in a higher-dimensional Hilbert space, the reduced density
matrix of which is identical to the original state. We characterize all sets of
mixed quantum states, for which perfect purification is possible. Surprisingly,
some sets of two non-commuting states are among them. Furthermore, we
investigate the possibility of performing an imperfect purification.
- oai_identifier:
- oai:arXiv.org:quant-ph/0509100
- categories:
- quant-ph
- comments:
- 5 pages, 1 figure; published version
- doi:
- 10.1103/PhysRevA.73.062309
- arxiv_id:
- quant-ph/0509100
- journal_ref:
- Phys. Rev. A 73, 062309 (2006)
- created:
- 2005-09-14
- updated:
- 2006-06-12
Full article ▸
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