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Coherent manipulation of Andreev Bound States in an atomic contact

Abstract : Localized electronic states, called Andreev bound states, appear in weak-links placed between superconducting electrodes. The experiments presented in this thesis explore the coherence properties of these states. Single atom contacts between aluminum electrodes are used as weak links. In order to isolate and probe these states, the atomic contacts are integrated in amicrowave cavity.In a first series of experiments, it is shown that Andreev states can be used to define a quantumbit, “the Andreev qubit”, which is controlled using microwave pulses.Measurements of the lifetime and coherence time of this qubit are thoroughly analyzed.In a second series of experiments, the interaction between the Andreev qubit and the microwave cavity are used to determine the number of photons present in the cavity as a function of the power of microwave pulses at its eigenfrequency.Finally, quantum and parity jumps are observed in continuous measurements of the state of the Andreev dot.
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  • HAL Id : tel-01431433, version 1

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Camille Janvier. Coherent manipulation of Andreev Bound States in an atomic contact. Superconductivity [cond-mat.supr-con]. Université Paris-Saclay, 2016. English. ⟨NNT : 2016SACLS217⟩. ⟨tel-01431433⟩

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