Non-Markovianity of local dephasing channels and time-invariant discord

被引：148
作者：
Haikka, P. [1 ]
Johnson, T. H. [2 ]
Maniscalco, S. [1 ,3 ]
机构：
[1] Univ Turku, Dept Phys & Astron, Turku Ctr Quantum Phys, FIN-20014 Turku, Finland
[2] Univ Oxford, Clarendon Lab, Oxford OX1 3PU, England
[3] Heriot Watt Univ, Sch Engn & Phys Sci, SUPA, Edinburgh EH14 4AS, Midlothian, Scotland
来源：
PHYSICAL REVIEW A | 2013年 / 87卷 / 01期
基金：
英国工程与自然科学研究理事会;
关键词：
QUANTUM;
D O I：
10.1103/PhysRevA.87.010103
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We study non-Markovianity and information flow for qubits experiencing local dephasing with an Ohmic class spectrum. We demonstrate the existence of a temperature-dependent critical value of the Ohmicity parameters for the onset of non-Markovianity and give a physical interpretation of this phenomenon by linking it to the form of the reservoir spectrum. We demonstrate that this link holds also for more general spectra. We unveil a class of initial states for which discord is forever frozen at a positive value. We connect time-invariant discord to non-Markovianity and propose a physical system in which it could be observed. DOI: 10.1103/PhysRevA.87.010103
引用
收藏
页数：5
相关论文
共 32 条
  • [1] Environment-Induced Sudden Transition in Quantum Discord Dynamics
    Auccaise, R.
    Celeri, L. C.
    Soares-Pinto, D. O.
    deAzevedo, E. R.
    Maziero, J.
    Souza, A. M.
    Bonagamba, T. J.
    Sarthour, R. S.
    Oliveira, I. S.
    Serra, R. M.
    [J]. PHYSICAL REVIEW LETTERS, 2011, 107 (14)
  • [2] Breuer H.P., 2007, THEORY OPEN QUANTUM, DOI DOI 10.1093/ACPROF:OSO/9780199213900.001.0001
  • [3] Measure for the Degree of Non-Markovian Behavior of Quantum Processes in Open Systems
    Breuer, Heinz-Peter
    Laine, Elsi-Mari
    Piilo, Jyrki
    [J]. PHYSICAL REVIEW LETTERS, 2009, 103 (21)
  • [4] Quantum Metrology in Non-Markovian Environments
    Chin, Alex W.
    Huelga, Susana F.
    Plenio, Martin B.
    [J]. PHYSICAL REVIEW LETTERS, 2012, 109 (23)
  • [5] Collective decoherence of cold atoms coupled to a Bose-Einstein condensate
    Cirone, M. A.
    De Chiara, G.
    Palma, G. M.
    Recati, A.
    [J]. NEW JOURNAL OF PHYSICS, 2009, 11
  • [6] Focus on quantum effects and noise in biomolecules
    Fleming, G. R.
    Huelga, S. F.
    Plenio, M. B.
    [J]. NEW JOURNAL OF PHYSICS, 2011, 13
  • [7] COMPLETELY POSITIVE DYNAMICAL SEMIGROUPS OF N-LEVEL SYSTEMS
    GORINI, V
    KOSSAKOWSKI, A
    SUDARSHAN, ECG
    [J]. JOURNAL OF MATHEMATICAL PHYSICS, 1976, 17 (05) : 821 - 825
  • [8] Robust non-Markovianity in ultracold gases
    Haikka, P.
    McEndoo, S.
    De Chiara, G.
    Palma, G. M.
    Maniscalco, S.
    [J]. PHYSICA SCRIPTA, 2012, T151
  • [9] Non-Markovianity, Loschmidt echo, and criticality: A unified picture
    Haikka, P.
    Goold, J.
    McEndoo, S.
    Plastina, F.
    Maniscalco, S.
    [J]. PHYSICAL REVIEW A, 2012, 85 (06):
  • [10] Quantifying, characterizing, and controlling information flow in ultracold atomic gases
    Haikka, P.
    McEndoo, S.
    De Chiara, G.
    Palma, G. M.
    Maniscalco, S.
    [J]. PHYSICAL REVIEW A, 2011, 84 (03):
1234