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Time-dependent dephasing and quantum transport

Moreira, Saulo V. LU ; Marques, Breno and Semião, Fernando L. (2021) In Entropy 23(9).
Abstract

The investigation of the phenomenon of dephasing assisted quantum transport, which happens when the presence of dephasing benefits the efficiency of this process, has been mainly focused on Markovian scenarios associated with constant and positive dephasing rates in their respective Lindblad master equations. What happens if we consider a more general framework, where time-dependent dephasing rates are allowed, thereby, permitting the possibility of non-Markovian scenarios? Does dephasing-assisted transport still manifest for non-Markovian dephasing? Here, we address these open questions in a setup of coupled two-level systems. Our results show that the manifestation of non-Markovian dephasing-assisted transport depends on the way in... (More)

The investigation of the phenomenon of dephasing assisted quantum transport, which happens when the presence of dephasing benefits the efficiency of this process, has been mainly focused on Markovian scenarios associated with constant and positive dephasing rates in their respective Lindblad master equations. What happens if we consider a more general framework, where time-dependent dephasing rates are allowed, thereby, permitting the possibility of non-Markovian scenarios? Does dephasing-assisted transport still manifest for non-Markovian dephasing? Here, we address these open questions in a setup of coupled two-level systems. Our results show that the manifestation of non-Markovian dephasing-assisted transport depends on the way in which the incoherent energy sources are locally coupled to the chain. This is illustrated with two different configurations, namely non-symmetric and symmetric. Specifically, we verify that non-Markovian dephasing-assisted transport manifested only in the non-symmetric configuration. This allows us to draw a parallel with the conditions in which time-independent Markovian dephasing-assisted transport manifests. Finally, we find similar results by considering a controllable and experimentally implementable system, which highlights the significance of our findings for quantum technologies.

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author
; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Non-Markovianity, Quantum technologies, Quantum transport
in
Entropy
volume
23
issue
9
article number
1179
publisher
MDPI AG
external identifiers
  • pmid:34573804
  • scopus:85114709766
ISSN
1099-4300
DOI
10.3390/e23091179
language
English
LU publication?
yes
id
e02bd2bf-f0c5-484c-ad3c-fe7431e1e824
date added to LUP
2021-10-11 11:00:16
date last changed
2025-04-04 14:42:07
@article{e02bd2bf-f0c5-484c-ad3c-fe7431e1e824,
  abstract     = {{<p>The investigation of the phenomenon of dephasing assisted quantum transport, which happens when the presence of dephasing benefits the efficiency of this process, has been mainly focused on Markovian scenarios associated with constant and positive dephasing rates in their respective Lindblad master equations. What happens if we consider a more general framework, where time-dependent dephasing rates are allowed, thereby, permitting the possibility of non-Markovian scenarios? Does dephasing-assisted transport still manifest for non-Markovian dephasing? Here, we address these open questions in a setup of coupled two-level systems. Our results show that the manifestation of non-Markovian dephasing-assisted transport depends on the way in which the incoherent energy sources are locally coupled to the chain. This is illustrated with two different configurations, namely non-symmetric and symmetric. Specifically, we verify that non-Markovian dephasing-assisted transport manifested only in the non-symmetric configuration. This allows us to draw a parallel with the conditions in which time-independent Markovian dephasing-assisted transport manifests. Finally, we find similar results by considering a controllable and experimentally implementable system, which highlights the significance of our findings for quantum technologies.</p>}},
  author       = {{Moreira, Saulo V. and Marques, Breno and Semião, Fernando L.}},
  issn         = {{1099-4300}},
  keywords     = {{Non-Markovianity; Quantum technologies; Quantum transport}},
  language     = {{eng}},
  number       = {{9}},
  publisher    = {{MDPI AG}},
  series       = {{Entropy}},
  title        = {{Time-dependent dephasing and quantum transport}},
  url          = {{http://dx.doi.org/10.3390/e23091179}},
  doi          = {{10.3390/e23091179}},
  volume       = {{23}},
  year         = {{2021}},
}