A post-Markovian master equation has been recently proposed as a tool to describe the evolution of a system coupled to a memory-keeping environment [A. Shabani and D. A. Lidar, Phys. Rev. A 71, 020101 (R) (2005)]. For a single qubit affected by appropriately chosen environmental conditions, the corresponding dynamics is always legitimate and physical. Here we extend such a situation to the case of two qubits, only one of which experiences the environmental effects.We show how, despite the innocence of such an extension, the introduction of the second qubit should be done cum grano salis to avoid consequences such as the breaking of the positivity of the associated dynamical map. This hints at the necessity of using care when adopting phenomenologically derived models for evolutions occurring outside the Markovian framework.
Critical assessment of two-qubit post-Markovian master equations / S. Campbell, A. Smirne, L. Mazzola, N. Lo Gullo, B. Vacchini, T. Busch, M. Paternostro. - In: PHYSICAL REVIEW A. - ISSN 1050-2947. - 85:3(2012 Mar 19), pp. 032120.032120.1-032120.032120.6.
|Titolo:||Critical assessment of two-qubit post-Markovian master equations|
SMIRNE, ANDREA (Secondo)
|Parole Chiave:||dynamical semigroups; quantum; systems|
|Settore Scientifico Disciplinare:||Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici|
|Data di pubblicazione:||2012|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1103/PhysRevA.85.032120|
|Appare nelle tipologie:||01 - Articolo su periodico|