RT Journal Article
T1 Excited-state quantum phase transition and the quantum speed limit time
A1 Wang, Qian
A1 Pérez Bernal, Francisco
AB We investigate the influence of an excited-state quantum phase transition on the quantum speedlimit time of an open quantum system. The system consists of a central qubit coupled to a spinenvironment modeled by a Lipkin-Meshkov-Glick Hamiltonian. We show that when the couplingbetween qubit and environment is such that the latter is located at the critical energy of the excitedstatequantum phase transition, the qubit evolution shows a remarkable slowdown, marked by anabrupt peak in the quantum speed limit time. Interestingly, this slowdown at the excited-statequantum phase transition critical point is induced by the singular behavior of the qubit decoherencerate, being independent of the Markovian nature of the environment.
PB American Physical Society
SN 1050-2947
SN 1094-1622 (electrónico)
YR 2019
FD 2019
LK http://hdl.handle.net/10272/20898
UL http://hdl.handle.net/10272/20898
LA eng
NO Wang, Q., & Pérez-Bernal, F. (2019). Excited-state quantum phase transition and the quantum-speed-limit time. In Physical Review A (Vol. 100, Issue 2). American Physical Society (APS). https://doi.org/10.1103/physreva.100.022118
DS Repositorio Institucional de la Universidad de Huelva
RD 30 may 2026