Decoherence dynamics of interacting qubits coupled to a bath of local optical phonons
| Autor: | Muzaffar Qadir Lone, Sudhakar Yarlagadda |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Density matrix
Physics Quantum decoherence Phonon Heisenberg model Statistical and Nonlinear Physics Condensed Matter Physics Polaron 01 natural sciences 010305 fluids & plasmas symbols.namesake Quantum mechanics Quantum master equation Qubit 0103 physical sciences symbols 010306 general physics Hamiltonian (quantum mechanics) |
| Zdroj: | International Journal of Modern Physics B. 30:1650063 |
| ISSN: | 1793-6578 0217-9792 |
| DOI: | 10.1142/s0217979216500636 |
| Popis: | We study decoherence in an interacting qubit system described by infinite range Heisenberg model (IRHM) in a situation where the system is coupled to a bath of local optical phonons. Using perturbation theory in polaron frame of reference, we derive an effective Hamiltonian that is valid in the regime of strong spin-phonon coupling under nonadiabatic conditions. It is shown that the effective Hamiltonian commutes with the IRHM upto leading orders of perturbation and thus has the same eigenstates as the IRHM. Using a quantum master equation with Markovian approximation of dynamical evolution, we show that the off-diagonal elements of the density matrix do not decay in the energy eigen basis of IRHM. |
| Databáze: | OpenAIRE |
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