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Quantum Zeno Dynamics in 3D Circuit-QED

Abstract : This thesis presents experimental work aimed at observing the quantum Zeno dynamics (QZD) in 3D circuit-QED, where an artificial atom, consisting of a superconducting circuit called a transmon, is coupled to the electric field of a microwave cavity resonator. The transmon and resonator energy levels are aligned in a novel way enabling the manipulation of individual Fock states of the cavity, while minimizing its transmon-induced Kerr non-linearity. We induce the QZD by displacing classically the cavity field while continuously driving strongly a transmon transition specific to a particular Fock state, which keeps this Fock state population at zero. The QZD is then observed by measuring the Wigner function of the fields at regular time intervals, either by Wigner tomography or standard quantum tomography and reconstruction of the density matrix. We observe three examples of QZD, and analyze the observed decoherence with the help of quantum simulations of the system.
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https://tel.archives-ouvertes.fr/tel-01427170
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2016PA066195.pdf
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  • HAL Id : tel-01427170, version 1

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Kristinn Júlíusson. Quantum Zeno Dynamics in 3D Circuit-QED. Superconductivity [cond-mat.supr-con]. Université Pierre et Marie Curie - Paris VI, 2016. English. ⟨NNT : 2016PA066195⟩. ⟨tel-01427170⟩

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