Thesis Collection
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Browsing by Author "Wang, Qian"
Now showing items 1-4 of 4
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Characterizing the Lipkin-Meshkov-Glick model excited state quantum phase transition using dynamical and statistical properties of the diagonal entropy
Wang, Qian; Pérez Bernal, Francisco
(American Physical Society, 2021-03)
Using the diagonal entropy, we analyze the dynamical signatures of the Lipkin-Meshkov-Glick (LMG) model excited-state quantum phase transition (ESQPT). We first show that the time evolution of the diagonal entropy behaves ... -
Excited-state quantum phase transition and the quantum speed limit time
Wang, Qian; Pérez Bernal, Francisco (American Physical Society, 2019)
We investigate the influence of an excited-state quantum phase transition on the quantum speed limit time of an open quantum system. The system consists of a central qubit coupled to a spin environment modeled by a ... -
Probing excited-state quantum phase transition in a quantum many body system via out-of-time-ordered correlator
Wang, Qian; Pérez Bernal, Francisco (Universidad Cornell, 2018)
As a measure of information scrambling and quantum chaos, out-of-time-ordered correlator (OTOC) plays more and more important role in many different fields of physics. In this work, we verify that the OTOC can also be ... -
Signatures of excited-state quantum phase transitions in quantum many-body systems: Phase space analysis
Wang, Qian; Pérez Bernal, Francisco (American Physical Society, 2021)
Using the Husimi quasiprobability distribution, we investigate the phase space signatures of excited-state quantum phase transitions (ESQPTs) in the Lipkin-Meshkov-Glick and coupled top models. We show that the ESQPT is ...
