High critical temperature superconductor Josephson junctions for quantum circuit applications
Paper in proceedings, 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

Author

Thilo Bauch

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

David Gustafsson

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Karin Cedergren

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Shahid Nawaz

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Mudassar Mumtaz Virk

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Henrik Pettersson

Chalmers, Applied Physics, Microscopy and Microanalysis

Eva Olsson

Chalmers, Applied Physics, Microscopy and Microanalysis

Floriana Lombardi

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Physica Scripta

Vol. T137 014006-

Subject Categories

Condensed Matter Physics

More information

Created

10/7/2017