Role of non-Markovianity and backflow of information in the speed of quantum evolution

Cianciaruso, Marco; Maniscalco, Sabrina; Adesso, Gerardo

Abstract

We consider a two-level open quantum system undergoing pure dephasing, dissipative, or multiply decohering dynamics and show that whenever the dynamics is non-Markovian, the initial speed of evolution is a monotonic function of the relevant physical parameter driving the transition between the Markovian and non-Markovian behavior of the dynamics. In particular, within the considered models, a speed increase can only be observed in the presence of backflow of information from the environment to the system.

• Journal Article Type: Article
• Acceptance Date: Jun 14, 2017
• Publication Date: Jul 6, 2017
• Deposit Date: Jul 14, 2017
• Publicly Available Date: Jul 14, 2017
• Journal: Physical Review A
• Print ISSN: 2469-9926
• Electronic ISSN: 1094-1622
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 96
• Issue: 1
• Article Number: 012105
• DOI: https://doi.org/10.1103/PhysRevA.96.012105
• Keywords: Open quantum systems, Decoherence
• Public URL: https://nottingham-repository.worktribe.com/output/871751
• Publisher URL: https://doi.org/10.1103/PhysRevA.96.012105
• Additional Information: ©2017 American Physical Society