Publication: Evolution processes of coupled thermal qubits
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Issued Date
2019
Resource Type
File Type
application/pdf
ISSN
3759601
Other identifier(s)
2-s2.0-85070863237
Rights Holder(s)
Scopus
Bibliographic Citation
Physics Letters, Section A: General, Atomic and Solid State Physics. Vol 383, No.31 (2019)
Suggested Citation
Chatchawaltheerat T., Khemmani S., Poulter J. Evolution processes of coupled thermal qubits. Physics Letters, Section A: General, Atomic and Solid State Physics. Vol 383, No.31 (2019). doi:10.1016/j.physleta.2019.125882 Retrieved from: https://hdl.handle.net/20.500.14740/5085
Author(s)
Abstract
We investigate the quantum speed limit time (QSLT) of quantum evolution before thermal equilibrium of two coupled qubits each of which is coupled to a separate thermal bath at the same temperature within the Born-Markov approximation. The evolution process in one particular initial state can change between speed-up and speed-down two times before reaching equilibrium. We call this double cusp behaviour. This behaviour is an anomalous phenomenon in evolution processes in the weak-coupling Markovian regime. We study QSLT corresponding to all pure initial energy eigenstates and categorise them. In addition, we also display the conditions for double cusp behaviour in terms of temperature, qubit interaction and frequency. © 2019 Elsevier B.V.