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The study of nonequilibrium dissipative quantum dynamics and its applications to energy transport and quantum information processes

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dc.contributor.advisor Wang, Jin en_US
dc.contributor.author Zhang, Zhedong en_US
dc.contributor.other Department of Physics en_US
dc.date.accessioned 2017-09-20T16:50:56Z
dc.date.available 2017-09-20T16:50:56Z
dc.date.issued 2016-12-01 en_US
dc.identifier.uri http://hdl.handle.net/11401/76672 en_US
dc.description 146 pg. en_US
dc.description.abstract Nonequilibrium quantum physics is of fundamental importance and interest. It is still an extremely hard issue even in today's theoretical physics because of the lack of the knowledge on the basic theories, like the nonequilibrium quantum statistical mechanics. The recent advances on theory and experiments reveal the essentiality of nonequilibrium quantum dynamics on explaining as well as understanding many interesting phenomenon, i.e., the ultrafast energy transfer \& long-survived quantum coherence in organic molecules, quantum phase transition and the novel transport properties of superfluid gas at low temperature. Here we will focus on the nonequilibrium quantum dynamics relaxing towards the steady state breaking the detailed balance, since this still remains elusive especially at far-from-equilibrium regime. Firstly we establish a theoretical framework in terms of curl quantum flux to uncover and profoundly understand the intrinsic relation between quantum coherence in systems and nonequilibriumness. This provides the microscopic explanation for the enhancement of coherence in molecular junctions at far-from-equilibrium. Secondly we explore the dynamical relaxation process towards the nonequilibrium steady state and study the important contribution of coherence to the dephasing time scale as well as dynamical energy transport. Moreover we also uncover the mechanism to explain long-lived coherence by effective field theory: the discrete molecular vibrations effectively weaken the exciton-environment interaction, due to the polaron effect. This subsequently demonstrates the role of vibrational coherence which greatly contributes to long-lived feature of the excitonic coherence observed in femtosecond experiments. As inspired by the quantum information process, we finally study the dynamics of spin arrays coupled to nuclear spin environments via the hyperfine interaction. This uncovers the rapid coherent oscillations of coherence and entanglement under detailed-balance-breaking, which has never been observed before, i.e., Overhauser noise. en_US
dc.description.sponsorship This work is sponsored by the Stony Brook University Graduate School in compliance with the requirements for completion of degree. en_US
dc.format Monograph en_US
dc.format.medium Electronic Resource en_US
dc.language.iso en_US en_US
dc.publisher The Graduate School, Stony Brook University: Stony Brook, NY. en_US
dc.subject.lcsh Theoretical physics -- Quantum physics -- Condensed matter physics en_US
dc.subject.other Curl flux, Monopole excitation, Nonequilibriumness, Quantum coherence, Qubit, Scale invariance en_US
dc.title The study of nonequilibrium dissipative quantum dynamics and its applications to energy transport and quantum information processes en_US
dc.type Dissertation en_US
dc.mimetype Application/PDF en_US
dc.contributor.committeemember Weinacht, Thomas en_US
dc.contributor.committeemember Herzog, Christopher en_US
dc.contributor.committeemember Li, Xiaolin. en_US

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