Decoherence of encoded quantum registers
Abstract
In order to eliminate disturbing effects of decoherence, encoding of quantum information in decoherence-free subspaces has been suggested. We analyze the benefits of this concept for a quantum register that is realized in a spin chain in contact with a common bosonic bath. Within a dissipationless model, we provide explicit analytical results for the average fidelity of plain and encoded quantum registers. For the investigation of dissipative spin-boson couplings, we employ a master equation of Bloch-Redfield type.
- Publication:
-
Physical Review A
- Pub Date:
- January 2008
- DOI:
- 10.1103/PhysRevA.77.012306
- arXiv:
- arXiv:0708.3775
- Bibcode:
- 2008PhRvA..77a2306B
- Keywords:
-
- 03.67.Pp;
- 02.50.Ga;
- 03.65.Yz;
- 03.67.Mn;
- Quantum error correction and other methods for protection against decoherence;
- Markov processes;
- Decoherence;
- open systems;
- quantum statistical methods;
- Entanglement production characterization and manipulation;
- Quantum Physics
- E-Print:
- 13 pages, 9 figures