Erratum: Nonlocal Memory Effects in the Dynamics of Open Quantum Systems [Phys. Rev. Lett.<b>108</b>, 210402 (2012)]

Laine, Elsi-Mari; Breuer, Heinz‐Peter; Piilo, Jyrki; Li, Chuan‐Feng; Guo, Guang‐Can

doi:10.1103/physrevlett.111.229901

Cited by 64 publications

(117 citation statements)

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“…This analysis can be easily extended to the higher orders. The inclusion of higher-order terms in the expansion It is known that the presence of an initial systemenvironment correlation can modify the ME [13,[43][44][45]. We note, however, that our correlation effect emerges dynamically and is present even when the system and environments are initially separable.…”

Section: A Diagrammatic Perspectivementioning

confidence: 99%

Quantum interference between independent reservoirs in open quantum systems

et al. 2014

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When a quantum system interacts with multiple reservoirs, the environmental effects are usually treated in an additive manner. We show that this assumption breaks down for non-Markovian environments that have finite memory times. Specifically, we demonstrate that quantum interferences between independent environments can qualitatively modify the dynamics of the physical system. We illustrate this effect with a two-level system coupled to two structured photonic reservoirs, discuss its origin using a nonequilibrium diagrammatic technique, and show an example when the application of this interference can result in an improved dark state preparation in a system.

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Section: A Diagrammatic Perspectivementioning

confidence: 99%

Quantum interference between independent reservoirs in open quantum systems

et al. 2014

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“…The peaks of the Gaussians are centered at ω j 1 and ω j 2 . Using this we can evaluate the integrals as [5] …”

Section: Two-qubit Dephasing Channel In the Sdc Protocolmentioning

confidence: 99%

“…The terms containing products of the κ i coefficients reflect the fact that the local channels are independent. For general, possibly correlated, channels these products should be replaced with more general functions, containing information about the correlations [5]. Equivalently, the independence of the local channels means that the dynamical map of the total system is a tensor product of local dynamical maps:…”

Section: Non-markovian Dynamics Of Two-qubit Dephasing Channelsmentioning

confidence: 99%

“…The conventional wisdom is that the noise is harmful for all quantum protocols and isolation from the surroundings is necessary for harnessing the quantum properties. However, recent work has shown, how adding even more noise to the system can actually be beneficial in certain cases [5][6][7][8][9]. Quantum information protocols, such as entanglement swapping, distillation, quantum teleportation, and quantum key distribution have been shown to benefit from correlated noise, when non-Markovian features are present.…”

Section: Introductionmentioning

confidence: 99%

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Non-Markovian dynamics in two-qubit dephasing channels with an application to superdense coding

et al. 2016

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We study the performance of two measures of non-Markovianity in detecting memory effects in two-qubit dephasing channels. By combining independent Markovian and non-Markovian noise on the qubits, our results show that the trace distance measure is able to detect the memory effects when at least one of the local channels displays non-Markovianity. A measure based on channel capacity, in turn, becomes non-zero when the global two-qubit dynamics shows memory effects. We apply these schemes to a well-known superdense coding protocol and demonstrate an optimal noise configuration to maximize the information transmission with independent local noises.

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“…So far, many factors that can trigger and modify the non-Markovian dynamics have been found, as strong system-environment coupling, structured reservoirs, low temperatures, and initial system-environment correlations [1,[4][5][6][36][37][38][39][40]. Apart from these mechanisms, some other peculiar conditions such as classical environments [41,42] and environmental initial correlations [43,44] have also been predicted and experimentally demonstrated [42,44] enabling emergence of non-Markovianity.…”

Section: Introductionmentioning

confidence: 99%

Harnessing non-Markovian quantum memory by environmental coupling

2015

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Controlling the non-Markovian dynamics of open quantum systems is essential in quantum information technology since it plays a crucial role in preserving quantum memory. Albeit in many realistic scenarios the quantum system can simultaneously interact with composite environments, this condition remains little understood, particularly regarding the effect of the coupling between environmental parts. We analyze the non-Markovian behavior of a qubit interacting at the same time with two coupled single-mode cavities which in turn dissipate into memoryless or memory-keeping reservoirs. We show that increasing the control parameter, that is the two-mode coupling, allows for triggering and enhancing a non-Markovian dynamics for the qubit starting from a Markovian one in absence of coupling. Surprisingly, if the qubit dynamics is non-Markovian for zero control parameter, increasing the latter enables multiple transitions from non-Markovian to Markovian regimes. These results hold independently on the nature of the reservoirs. This work highlights that suitably engineering the coupling between parts of a compound environment can efficiently harness the quantum memory, stored in a qubit, based on non-Markovianity.

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Erratum: Nonlocal Memory Effects in the Dynamics of Open Quantum Systems [Phys. Rev. Lett.108, 210402 (2012)]

Cited by 64 publications

References 1 publication

Quantum interference between independent reservoirs in open quantum systems

Quantum interference between independent reservoirs in open quantum systems

Non-Markovian dynamics in two-qubit dephasing channels with an application to superdense coding

Harnessing non-Markovian quantum memory by environmental coupling

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