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Dynamique quantique d'un SQUID-DC

Abstract : A theoretical study that we went through predicted that a DC-SQUID, having a quality factor equals to 100 in its quantum macroscopic regime, permits one shot quantum measurement of the charge state of a qubit within an error of the order of 2%. This thesis work is then a study and an experimental development of a quantum measurement of a SQUID. We studied the escape dynamic from the zero voltage state of an inductif DC-SQUID as a function of flux and temperature. We showed up the macroscopic quantum regime and thermal activation regime, in the way of the escape of a fictive metastable particule from a bidimensionnal potential. The lifetime of the zero voltage state of a SQUID in its thermal activation regime was measured in the nano-seconde range using a flux pulses technique. Th euse of microwaves pulses permitted also to measure the plasma frequency of a SQUID using a resonante activation technique, and to measure a quality factor of the order of 100.
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https://tel.archives-ouvertes.fr/tel-00004224
Contributor : Nathalie Le Moulec <>
Submitted on : Tuesday, January 20, 2004 - 1:05:57 PM
Last modification on : Friday, November 6, 2020 - 4:01:35 AM
Long-term archiving on: : Wednesday, September 12, 2012 - 12:40:09 PM

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  • HAL Id : tel-00004224, version 1

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UJF | CNRS | UGA

Citation

Franck Balestro. Dynamique quantique d'un SQUID-DC. Supraconductivité [cond-mat.supr-con]. Université Joseph-Fourier - Grenoble I, 2003. Français. ⟨tel-00004224⟩

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