Irreversible adiabatic decoherence of dipole-interacting nuclear-spin pairs coupled with a phonon bath
| Autor: | F. D. Domínguez, C. E. González, R. C. Zamar, H. H. Segnorile |
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| Rok vydání: | 2016 |
| Předmět: |
Physics
Quantum decoherence Spin states Condensed matter physics Phonon 02 engineering and technology 021001 nanoscience & nanotechnology Adiabatic quantum computation 01 natural sciences Open quantum system symbols.namesake Quantum mechanics 0103 physical sciences symbols Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology Hamiltonian (quantum mechanics) Adiabatic process Spin (physics) |
| Zdroj: | Physical Review A. 93 |
| ISSN: | 2469-9934 2469-9926 |
| DOI: | 10.1103/physreva.93.022120 |
| Popis: | We report a first-principle theoretical study of the adiabatic decoherence undergone by a nuclear spin system in a solid, coupled to the phonon field through the dipolar interaction. The calculations are performed for a chain of weakly interacting 1/2-spin pairs, considered as an open quantum system in contact with a bosonic heat bath. By incorporating to the whole system Hamiltonian the fluctuations of the local dipolar energy produced by low frequency phonons, and assuming that this low energy fluctuations are adiabatic, we find that the spin dynamics can be described in closed form through a spin-boson model. The obtained results show that the coupling with the phonons destroy the spin coherence, and the efficiency of the process significantly depends on the complexity of the involved spin states. By using realistic values for the various parameters of the model, we conclude that this mechanism can be particularly efficient to degrade multi-spin coherences, when the number of `active' spins involved in a given coherence is high. In this way, we show that the spin coherence in the adiabatic regime can be noticeably affected by this mechanism. |
| Databáze: | OpenAIRE |
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