We address the non-Markovian character of quantum maps describing the interaction of a qubit with a random classical field. In particular, we evaluate trace- and capacity-based non-Markovianity measures for two relevant classes of environments showing non-Gaussian fluctuations, described respectively by random telegraph noise and colored noise with spectra of the the form 1/fα. We analyze the dynamics of both the trace distance and the quantum capacity, and show that the behavior of non-Markovianity based on both measures is qualitatively similar. Our results show that environments with a spectrum that contains a relevant low-frequency contribution are generally non-Markovian. We also find that the non-Markovianity of colored environments decreases when the number of fluctuators realizing the environment increases.
Non-Markovianity of colored noisy channels / C. Benedetti, M.G.A. Paris, S. Maniscalco. - In: PHYSICAL REVIEW A. - ISSN 1050-2947. - 89:1(2014 Jan 16), pp. 012114.1-012114.8. [10.1103/PhysRevA.89.012114]
Non-Markovianity of colored noisy channels
C. BenedettiPrimo
;M.G.A. ParisSecondo
;
2014
Abstract
We address the non-Markovian character of quantum maps describing the interaction of a qubit with a random classical field. In particular, we evaluate trace- and capacity-based non-Markovianity measures for two relevant classes of environments showing non-Gaussian fluctuations, described respectively by random telegraph noise and colored noise with spectra of the the form 1/fα. We analyze the dynamics of both the trace distance and the quantum capacity, and show that the behavior of non-Markovianity based on both measures is qualitatively similar. Our results show that environments with a spectrum that contains a relevant low-frequency contribution are generally non-Markovian. We also find that the non-Markovianity of colored environments decreases when the number of fluctuators realizing the environment increases.File | Dimensione | Formato | |
---|---|---|---|
7_PhysRevA.89.012114_Markovianity-colored-channels.pdf
accesso solo dalla rete interna
Tipologia:
Publisher's version/PDF
Dimensione
610.47 kB
Formato
Adobe PDF
|
610.47 kB | Adobe PDF | Visualizza/Apri Richiedi una copia |
Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.