Non-Markovian dissipative dynamics of two coupled qubits in independent reservoirs: Comparison between exact solutions and master-equation approaches
- Authors: Ferraro, E; Scala, M; Migliore, R; Napoli, A
- Publication year: 2009
- Type: Articolo in rivista (Articolo in rivista)
- Key words: open quantum system, master equation techniques
- OA Link: http://hdl.handle.net/10447/46437
Abstract
The reduced dynamics of two interacting qubits coupled to two independent bosonic baths is investigated. The one-excitation dynamics is derived and compared with that based on the resolution of appropriate non-Markovian master equations. The Nakajima-Zwanzig and the time-convolutionless projection operator techniques are exploited to provide a description of the non-Markovian features of the dynamics of the two-qubit system. The validity of such approximate methods and their range of validity in correspondence to different choices of the parameters describing the system are brought to light.