Non-Markovian Steady States of a Driven Two-Level System
Artikel i vetenskaplig tidskrift, 2022

We show that an open quantum system in a non-Markovian environment can reach steady states that it cannot reach in a Markovian environment. As these steady states are unique for the non-Markovian regime, they could offer a simple way of detecting non-Markovianity, as no information about the system's transient dynamics is necessary. In particular, we study a driven two-level system (TLS) in a semi-infinite waveguide. Once the waveguide has been traced out, the TLS sees an environment with a distinct memory time. The memory time enters the equations as a time delay that can be varied to compare a Markovian to a non-Markovian environment. We find that some non-Markovian states show exotic behaviors such as population inversion and steady-state coherence beyond 1/8, neither of which is possible for a driven TLS in the Markovian regime, where the time delay is neglected. Additionally, we show how the coherence of quantum interference is affected by time delays in a driven system by extracting the effective Purcell-modified decay rate of a TLS in front of a mirror.


Decay (organic)

Seebeck effect

Quantum optics


Andreas Josefsson Ask

Chalmers, Mikroteknologi och nanovetenskap, Tillämpad kvantfysik

Göran Johansson

Chalmers, Mikroteknologi och nanovetenskap, Tillämpad kvantfysik

Physical Review Letters

0031-9007 (ISSN) 1079-7114 (eISSN)

Vol. 128 8 083603

Kvantinformation med mikrovågor och ytakustiska vågor

Vetenskapsrådet (VR) (2017-04197), 2018-01-01 -- 2021-12-31.




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