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Open Quantum Systems Decoherence

Eternally non-Markovian dynamics of a qubit interacting with a single-photon wavepacket

arXiv
Authors: Anita Dąbrowska, Dariusz Chruściński, Sagnik Chakraborty, Gniewomir Sarbicki

Year

2020

Paper ID

403

Status

Preprint

Abstract Read

~2 min

Abstract Words

106

Citations

N/A

Abstract

An evolution of a two-level system (qubit) interacting with a single-photon wave packet is analyzed. It is shown that a hierarchy of master equations gives rise to phase covariant qubit evolution. The temporal correlations in the input field induce nontrivial memory effects for the evolution of a qubit. It is shown that in the resonant case whenever time-local generator is regular (does not display singularities) the qubit evolution never displays information backflow. However, in general the generator might be highly singular leading to intricate non-Markovian effects. A detailed analysis of the exponential profile is provided which allows to illustrate all characteristic feature of the qubit evolution.

Why This Paper Matters

  • This paper contributes to the Open Quantum Systems & Decoherence research area in the Quantum Articles archive.
  • It adds a 2020 reference point for readers tracking recent quantum research.
  • An evolution of a two-level system (qubit) interacting with a single-photon wave packet is analyzed.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2012.15317 [2] arXiv https://arxiv.org/abs/2012.15317 [3] Publisher https://arxiv.org/abs/2012.15317

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