Cited by 1,037Quantum Information and CryptographyQuantum Mechanics and ApplicationsAdvanced Thermodynamics and Statistical Mechanics

The DOI matches its Crossref record; 21 of the 22 references it cites were found in a registry or an index; none of the 9 sources its claims cite is checked for support yet.

Entanglement and Non-Markovianity of Quantum Evolutions

Open access
Rivas, Ángel, Huelga, Susana F., Plenio, Martin B.·2010·Physical Review Letters

Abstract

We address the problem of quantifying the non-markovian character of quantum time evolutions of general systems in contact with an environment. We introduce two different measures of non-markovianity that exploit the specific traits of quantum correlations and are suitable for opposite experimental contexts. When complete tomographic knowledge about the evolution is available, our measure provides a necessary and sufficient condition to quantify strictly the non-markovianity. In the opposite case, when no information whatsoever is available, we propose a sufficient condition for non-markovianity. Remarkably, no optimization procedure underlies our derivation, which greatly enhances the practical relevance of the proposed criteria.

Overview

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Written from the paper’s full text.

TL;DR

The paper introduces two measures of non-Markovianity for quantum evolutions that avoid optimization: an entanglement-based sufficient condition usable when the dynamics is unknown, and a necessary-and-sufficient CP-divisibility measure when the dynamical map can be reconstructed. It illustrates the approach with a damped harmonic oscillator coupled to Ohmic and super-Ohmic baths and with a qubit pure-dephasing model.

Key findings

  • A sufficient condition for non-Markovianity is \(I(\mathcal{E})>0\), obtained by preparing a maximally entangled system-ancilla state and checking for non-monotonic decay of entanglement; Markovian evolutions give \(I(\mathcal{E})=0\).
  • When the dynamical map is known, non-Markovianity is equivalent to the existence of times \(t,\epsilon\) such that \(\mathcal{E}(t+\epsilon,t)\) is not completely positive; the proposed measure uses \(f_{\mathrm{NCP}}\), \(g(t)\ge 0\), and \(I=\int g(t)\,dt\), with normalized \(D_{\mathrm{NM}}=I/(I+1)\) so that \(D_{\mathrm{NM}}=0\) for Markovian and \(D_{\mathrm{NM}}\to 1\) for \(I\to\infty\).
  • For a damped harmonic oscillator with Ohmic bath \(J(\omega)=\alpha\omega e^{-\omega/\omega_c}\), the simulations show that \(\alpha\to 0\) approaches Markovian evolution independently of temperature \(T\), while the onset of non-Markovianity is \(T\)-dependent: the coupling \(\alpha\) at which \(I(\mathcal{E})\) becomes nonzero increases with increasing temperature, as does \(I(\mathcal{E})\) for sufficiently large \(\alpha\).
  • A super-Ohmic bath \(J(\omega)=\alpha\omega^3 e^{-\omega/\omega_c}\) shows analogous behavior, but the specific value of \(I(\mathcal{E})\) for given \(T\) and \(\alpha\) depends strongly on the bath spectral function; for qubit pure dephasing \(d\rho/dt=\gamma(t)(\sigma_z\rho\sigma_z-\rho)\), \(I\) is proportional to the area of \(\gamma(t)\) below zero, and if negative \(\gamma(t)\) does not tend to zero fast enough then \(I\to\infty\), as with \(\gamma(t)\sim\tan(t)\).

Methods

  • Theoretical proposal with two criteria: an entanglement-based sufficient condition for unknown dynamics, and a necessary-and-sufficient condition based on complete positivity of infinitesimal dynamical maps when the evolution can be exactly reconstructed, e.g. by process tomography or a microscopic model.
  • For the unknown-dynamics measure, a maximally entangled state \(|\Phi\rangle=\frac{1}{\sqrt{d}}\sum_{n=0}^{d-1}|n\rangle|n\rangle\) is prepared between the system and an isolated ancilla, and the entanglement is monitored over \([t_0,t_{\max}]\).
  • Illustrative simulations use a single damped harmonic oscillator coupled to a bath under the rotating wave approximation, with Ohmic and super-Ohmic spectral densities, several temperatures, and varying coupling strengths; entanglement is quantified by logarithmic negativity for Gaussian states.

Limitations

  • The paper states that the entanglement-based criterion is only sufficient: there can be non-Markovian quantum evolutions that remain undetected because \(I(\mathcal{E})>0\) is not necessary.
  • The necessary-and-sufficient measure requires exact reconstruction of the dynamical map; if \(\mathcal{E}(t,0)\) is not invertible for larger times, \(\mathcal{E}(t+\epsilon,t)\) cannot be defined unequivocally, and the integral measure is finite only if \(g(t)\) decreases fast enough, which “will not be always the case.”
  • The simulations use a discrete and finite number of bath oscillators, which the authors say affects the results; they choose parameters so that \(t_{\max}\) is shorter than the bath recurrence time. Evident from the text: the work is theoretical/simulated and does not report experimental validation.

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Integrity signals

Registry

Crossref · 10.1103/physrevlett.105.050403

Cites

21 of 21 references verified0 citation errors · 0 not checkable

Statistics

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Verification

Claims the paper makes

0 of 9 cited sources checked · 0 supported · 0 flagged

Show all 18 claims

  • Probably not a substantial claim. 6
  • The quote only partly states this claim. 1
  • It may state two separate claims as one. 6
10 of 10
  • The paper relies on this without support.

    An accurate microscopic model of the system-bath interaction may be unfeasible, especially for many-body systems.

    “The exact details of what makes a given quantum evolution non-Markovian may be complicated, and in many cases, especially when thinking about many-body systems, an accurate microscopic model of the system-bath interaction may actually be unfeasible.”
  • The authors state this as an assumption.

    The rotating wave approximation (RWA) is valid in the model.

    “we have assumed the validity of the rotating wave approximation (RWA).”
  • The authors state this as an assumption.

    The bath is initially in a thermal state.

    “The bath is assumed to be initially in a thermal state ρ B = exp( -H B /T ) / tr [exp ( -H B /T )]”
  • The paper relies on this without support.

    The ancillary system remains isolated from decoherence sources.

    “an ancillary system which has to remain isolated from the decoherence sources”
4 of 4

Claims other papers make about this one

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Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

Each contradiction between two passages listed here was confirmed by an independent check.

  • Unknown-dynamics criterion is called both necessary and sufficient

    Minor

    The paper says this criterion can miss some non-Markovian evolutions, and later explicitly calls a positive result sufficient for non-Markovianity. Calling it a necessary condition for detecting deviations contradicts those statements.

  • Entanglement derivative need not be strictly negative for Markovian evolution

    Minor

    The identity evolution is Markovian but leaves entanglement constant, giving a zero derivative rather than an always-negative one.

2 of 2

Citations

Cites

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1 of the 22 references couldn’t be matched to a known paper.

Research works printed but not linked: 2

  1. A. Kossakowski, 1972, Bull. Acad. Polon. Sci., Sér. Sci. Math., 20, 1021
  2. M. Reed, 1975, Methods of Modern Mathematical Physics II

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Metadata

Authors
Rivas, Á., Huelga, S. F., & Plenio, M. B.
Affiliations
  • University of Hertfordshire (GB)
  • Universität Ulm (DE)
Venue
Physical Review Letters
Published
2010-07-28
Volume
105
Issue
5
Pages
050403-050403
ISSN
  • 0031-9007 (ISSN-L)
  • 1079-7114
OpenAlex
W2087654101
Cited by
1,037
References
22
Citations by year
2026: 67 · 2025: 83 · 2024: 63 · 2023: 59 · 2022: 67 · 2021: 73 · 2020: 75 · 2019: 72 · 2018: 62 · 2017: 68 · 2016: 67 · 2015: 64 · 2014: 69 · 2013: 50 · 2012: 58
FWCI
49.75
Type
journal article
Language
en
Open access
Locations
  • Physical Review Letters (publishedVersion)
  • PubMed (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • University of Hertfordshire Research Archive (University of Hertfordshire) (submittedVersion)
  • arXiv (Cornell University)
Topics
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum Information and Cryptography
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum Mechanics and Applications
  • Physical Sciences › Physics and Astronomy › Statistical and Nonlinear Physics › Advanced Thermodynamics and Statistical Mechanics
Keywords
non-Markovianity, quantum entanglement, open quantum systems, quantum correlations, non-Markovianity measures, quantum evolution, system-environment interaction, necessary and sufficient conditions, quantum state tomography

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