LANDAU-ZENER TRANSITIONS IN THE PRESENCE OF SPIN ENVIRONMENT
| Autor: | Andy T. S. Wan, Shannon X. Wang, M. H. S. Amin |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Physics
Quantum phase transition Quantum decoherence Condensed Matter - Mesoscale and Nanoscale Physics Physics and Astronomy (miscellaneous) FOS: Physical sciences Adiabatic quantum computation Quantum mechanics Excited state Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Ground state Adiabatic process Quantum computer Spin-½ |
| Zdroj: | International Journal of Quantum Information. :725-737 |
| ISSN: | 1793-6918 0219-7499 |
| DOI: | 10.1142/s0219749909005353 |
| Popis: | We study the effect of an environment consisting of noninteracting two level systems on Landau-Zener transitions with an interest on the performance of an adiabatic quantum computer. We show that if the environment is initially at zero temperature, it does not affect the transition probability. An excited environment, however, will always increase the probability of making a transition out of the ground state. For the case of equal intermediate gaps, we find an analytical upper bound for the transition probability in the limit of large number of environmental spins. We show that such an environment will only suppress the probability of success for adiabatic quantum computation by at most a factor close to 1/2. 12 pages, 3 figures, to appear in Int. J. Quant. Inf |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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