|
| related topics |
| {states, state, optimal} |
| {entanglement, phys, rev} |
| {state, states, entangled} |
| {qubit, qubits, gate} |
| {error, code, errors} |
| {group, space, representation} |
| {cos, sin, state} |
|
Completely positive covariant two-qubit quantum processes and optimal
quantum NOT operations for entangled qubit pairs
J. Novotny, G. Alber, I. Jex
abstract: The structure of all completely positive quantum operations is investigated
which transform pure two-qubit input states of a given degree of entanglement
in a covariant way. Special cases thereof are quantum NOT operations which
transform entangled pure two-qubit input states of a given degree of
entanglement into orthogonal states in an optimal way. Based on our general
analysis all covariant optimal two-qubit quantum NOT operations are determined.
In particular, it is demonstrated that only in the case of maximally entangled
input states these quantum NOT operations can be performed perfectly.
- oai_identifier:
- oai:arXiv.org:quant-ph/0603184
- categories:
- quant-ph
- comments:
- 14 pages, 2 figures
- doi:
- 10.1103/PhysRevA.73.062311
- arxiv_id:
- quant-ph/0603184
- created:
- 2006-03-21
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