Many-Body Dephasing in a Cryogenic Trapped Ion Quantum Simulator

dc.contributor.advisorMonroe, Christopher Ren_US
dc.contributor.authorKaplan, Harvey B.en_US
dc.contributor.departmentPhysicsen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2020-02-01T06:38:15Z
dc.date.available2020-02-01T06:38:15Z
dc.date.issued2019en_US
dc.description.abstractWhile realizing a fully functional quantum computer presents a long term technical goal, in the present, there are small to mid-sized quantum simulators (up to $\sim 100$ qubits), that are capable of approaching specialized problems. The quantum simulator discussed here uses trapped ions to act as qubits and is housed in a cryogenically cooled vacuum chamber in order to reduce the background pressure, thereby increasing ion chain length and life-time. The details of performance and characterization of this cryogenic apparatus are discussed, and this system is used to study many-body dephasing in a finite-sized quantum spin system. How a closed quantum many-body system relaxes and dephases as a function of time is important to understand when dealing with many-body spin systems. In this work, the first experimental observation of persistent temporal fluctuations after a quantum quench is presented with a tunable long-range interacting transverse-field Ising Hamiltonian. The fluctuations in the average magnetization of a finite-size system of spin-$1/2$ particles are measured presenting a direct measurement of relaxation dynamics in a non-integrable system. This experiment is in the regime where the properties of the system are closely related to the integrable Hamiltonian with global coupling. The system size is varied in order to investigate the dependence on finite-size scaling, and the system size scaling exponent extracted from the measured fluctuations is consistent with theoretical prediction.en_US
dc.identifierhttps://doi.org/10.13016/jypg-oxac
dc.identifier.urihttp://hdl.handle.net/1903/25426
dc.language.isoenen_US
dc.subject.pqcontrolledPhysicsen_US
dc.subject.pqcontrolledApplied physicsen_US
dc.subject.pqcontrolledQuantum physicsen_US
dc.subject.pquncontrolledatomic physicsen_US
dc.subject.pquncontrolledcryogenicen_US
dc.subject.pquncontrolledmany-bodyen_US
dc.subject.pquncontrolledquantum quenchen_US
dc.subject.pquncontrolledQuantum simulationen_US
dc.subject.pquncontrolledtrapped ionen_US
dc.titleMany-Body Dephasing in a Cryogenic Trapped Ion Quantum Simulatoren_US
dc.typeDissertationen_US

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