Eternally non-Markovian dynamics of a qubit interacting with a single-photon wavepacket. (9th December 2021)

• Record Type: Journal Article
• Authors: Dąbrowska, Anita; Chruściński, Dariusz; Chakraborty, Sagnik; Sarbicki, Gniewomir
• Is Part Of: New journal of physics. Volume 23:Number 12(2021)
• Publication Date: 2021-12-09
• Subjects: single-photon state -- open quantum systems -- non-Markovianity -- master equation; Physics -- Periodicals; Physics; Periodicals; 530.05
• DOI: 10.1088/1367-2630/ac3c60
• Languages: English
• ISSNs: 1367-2630

Abstract

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.