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Foundations of Quantum Mechanics in the Light of New Technology

MACROSCOPIC QUANTUM TUNNELING IN HIGH-TC SUPERCONDUCTOR JOSEPHSON JUNCTIONS

Shiro Kawabata

Published Jun 1, 2006• 0 citations
Publisher
DOI
10.1142/9789812773210_0048

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THEORY OF MACROSCOPIC QUANTUM DYNAMICS IN HIGH-TC JOSEPHSON JUNCTIONS

Shiro Kawabata

We have theoretically investigated macroscopic quantum tunneling (MQT) and the influence of nodal quasiparticles and zero energy bound states (ZES) on MQT in s-wave/d-wave hybrid Josephson junctions. In contrast to d-wave/d-wave junctions, the low-energy quasiparticle dissipation resulting from nodal quasiparticles and ZES is suppressed due to a quasiparticle-tunneling blockade effect in an isotropic s-wave superconductor. Therefore, the inherent dissipation in these junctions is found to be weak. This result suggests high potential of s-wave/d-wave hybrid junctions for applications in quantum information devices.

arXiv:0912.4565•Foundations of Quantum Mechanics in the Light of New Technology•Jun 1, 2009•0 citations
We have theoretically investigated macroscopic quantum tunneling (MQT) and the influence of nodal quasiparticles and zero energy bound states (ZES) on MQT in s-wave/d-wave hybrid Josephson junctions. In contrast to d-wave/d-wave junctions, the low-energy quasiparticle dissipation resulting from nodal quasiparticles and ZES is suppressed due to a quasiparticle-tunneling blockade effect in an isotropic s-wave superconductor. Therefore, the inherent dissipation in these junctions is found to be weak. This result suggests high potential of s-wave/d-wave hybrid junctions for applications in quantum information devices.