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International Journal of Theoretical Physics

Classification of Classical Non-Gaussian Noises with Respect to Their Detrimental Effects on the Evolution of Entanglement Using a System of Three-Qubit as Probe

Lionel Tenemeza Kenfack, Martin Tchoffo, Lukong Cornelius Fai

Published Nov 12, 2019• 4 citations
Publisher
DOI
10.1007/s10773-019-04300-7

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We use a system of three non-interacting qubits as a quantum probe to classify three classical non-Gaussian noises (namely the static, colored (pink and brown) and random telegraph noise), according to their detrimental effects on the evolution of entanglement of the latter. The probe system is initially prepared in the GHZ state and coupled to the noises in independent environments. Seven configurations for the qubit-noise coupling (QNC) are considered. To estimate the destructive influence of each kind of noise, we employ the tripartite negativity to compare the evolution of entanglement in these QNC configurations to each other with the same noise parameters. The results show that the evolution of entanglement is drastically impacted by the QNC configuration considered as well as the properties of the environmental noises and that the SN is more detrimental to the survival of entanglement than the RTN and CN, regardless of the Markov or non-Markov character of the RTN and the color of the CN. We also observed that pink noise is more fatal to the system than the RTN and that the situation is totally reversed in the case of brown noise. Finally, we show that these noises, in descending order of destructive influence, can be classified as follows: SN>pink noise>RTN>brown noise.
The understanding and characterization of realistic noise are critical for assessing and reducing errors in qubits, but theoretical studies often overlook the different roles of Gaussian and non-Gaussian noise in reducing qubit coherence. The authors employ two theoretical approaches to inspect such differences in solid-state qubits, and find a symmetry-breaking effect that is unique to non-Gaussian noise and can be detected experimentally. They also propose a protocol that can significantly increase the coherence time. These findings provide simple yet powerful tools for detecting non-Gaussian noise as well as mitigating its detrimental effect on the qubits.