High critical temperature superconductor Josephson junctions for quantum circuit applications
Paper i proceeding, 2009

Recent findings of macroscopic quantum properties in high critical temperature superconductor (HTS) Josephson junctions (JJs) point toward the need to revise the role of zero energy quasi-particles in this novel superconductor. We will discuss the possibility of designing superconducting artificial atoms in a transmon configuration to study the low energy excitation spectra of HTS. We have engineered high quality grain boundary JJs on low dielectric constant substrates. By fabricating submicron junctions, we extract values of capacitance and Josephson critical current densities that satisfy the main transmon design requirements. Moreover, the measured critical current noise power extrapolated at 1 Hz gives a dephasing time of 25 ns, which indicates that the observation of macroscopic quantum coherent effects in HTS JJ is a feasible task.

superconductivity

strongly correltated electron systems

copper oxides

macroscopic quantum coherence

Författare

Thilo Bauch

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

David Gustafsson

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Karin Cedergren

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Shahid Nawaz

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Mudassar Mumtaz Virk

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Henrik Pettersson

Chalmers, Teknisk fysik, Mikroskopi och mikroanalys

Eva Olsson

Chalmers, Teknisk fysik, Mikroskopi och mikroanalys

Floriana Lombardi

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Physica Scripta

Vol. T137 014006-

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