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Statut |
Confirmé |
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Série |
CONDMAT-ENS |
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Domaines |
cond-mat |
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Date |
Mardi 13 Mars 2012 |
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Heure |
11:30 |
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Institut |
LPTENS |
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Salle |
Conf IV, 24 rue Lhomond (LPT ENS, 2nd floor) |
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Nom de l'orateur |
Catelani |
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Prenom de l'orateur |
Gianluigi |
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Addresse email de l'orateur |
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Institution de l'orateur |
Yale, USA |
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Titre |
Quasiparticle effects in superconducting qubits |
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Résumé |
Superconducting qubits based on Josephson junctions are a promising platform for quantum computation, but their lifetimes are too short to implement error correction schemes. In this talk I will discuss an intrinsic relaxation mechanism limiting the lifetime, which is due to the interaction between the qubit degree of freedom and the quasiparticles tunneling through the junctions. Our theory is valid for both equilibrium and nonequilibrium quasiparticles. We find that the qubit decay rate depends on the magnetic flux controlling the qubit. In addition to the relaxation rate, we predict the shift of the qubit frequency. Aspects of our theory have been successfully tested in recent experiments. It also opens ways to differentiate the quasiparticle-induced relaxation from other relaxation mechanisms. |
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Numéro de preprint arXiv |
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Commentaires |
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Fichiers attachés |
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