|
| related topics |
| {operator, operators, space} |
| {time, decoherence, evolution} |
| {cos, sin, state} |
| {state, states, entangled} |
| {let, theorem, proof} |
| {light, field, probe} |
| {entanglement, phys, rev} |
| {state, phys, rev} |
| {group, space, representation} |
| {states, state, optimal} |
|
Incoherent control and entanglement for two-dimensional coupled systems
R. Romano, D. D'Alessandro
abstract: We investigate accessibility and controllability of a quantum system S
coupled to a quantum probe P, both described by two-dimensional Hilbert spaces,
under the hypothesis that the external control affects only P. In this context
accessibility and controllability properties describe to what extent it is
possible to drive the state of the system S by acting on P and using the
interaction between the two systems. We give necessary and sufficient
conditions for these properties and we discuss the relation with the entangling
capability of the interaction between S and P. In particular, we show that
controllability can be expressed in terms of the SWAP operator, acting on the
composite system, and its square root.
- oai_identifier:
- oai:arXiv.org:quant-ph/0510020
- categories:
- quant-ph
- comments:
- Latex, 13 pages
- doi:
- 10.1117/12.664735
- arxiv_id:
- quant-ph/0510020
- journal_ref:
- Phys. Rev. A 73, 022323 (2006)
- created:
- 2005-10-03
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