PT Journal
AU Hinarejos, M
   Bañuls, MC
   Perez, A
   de Vega, I
TI Non-Markovianity and memory of the initial state
SO Journal of Physics A
JI J. Phys. A
PY 2017
BP 335301 - 17pp
VL 50
IS 32
DI 10.1088/1751-8121/aa7972
LA English
DE non-Markovianity; quantum distinguisability; quantum fidelity
AB We explore in a rigorous manner the intuitive connection between the non-Markovianity of the evolution of an open quantum system and the performance of the system as a quantum memory. Using the paradigmatic case of a two-level open quantum system coupled to a bosonic bath, we compute the recovery fidelity, which measures the best possible performance of the system to store a qubit of information. We deduce that this quantity is connected, but not uniquely determined, by the non-Markovianity, for which we adopt the Breuer-Laine-Piilo measure proposed in Breuer et al (2009 Phys. Rev. Lett. 103 210401). We illustrate our findings with explicit calculations for the case of a structured environment.
ER