Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Bulletin of the American Physical Society

Enhancement of macroscopic quantum tunneling in Josephson junctions with multigap superconductors through zero-point fluctuations of Josephson-Leggett mode

Yukihiro Ota, Masahiko Machida, Tomio Koyama

Published Mar 24, 2011• 0 citations
OpenAlex

Related papers

Inter-band phase fluctuations in macroscopic quantum tunneling of multi-gap superconducting Josephson junctions

Hidehiro Asai, Yukihiro Ota, Shiro Kawabata +1 more

Physica C Superconductivity•Feb 22, 2014•1 citation

Zero-point fluctuation and noise phenomena in Josephson junctions

JIANG WANG-YE, Fu-sui Liu

Journal of Low Temperature Physics•Jan 1, 1986•0 citations

Macroscopic quantum effects in a Josephson tunnel junction

J. R. Clarke, A.N. Cleland, Michel Devoret +2 more

This paper discusses the observation of quantum effects in the macroscopic system of a Josephson tunnel junction. The macroscopic degree of freedom is the phase difference delta between the phases of the order parameters in the two superconductors on either side of the tunnel barrier. As we shall see, the anharmonicity enables us to observe the quantized energy levels because they are no longer equally spaced, and to observe the zero point motion by the demonstration that the system tunnels out of its initial state. 6 refs., (LSP)

•May 1, 1987•0 citations

MACROSCOPIC QUANTUM TUNNELING IN HIGH-TC SUPERCONDUCTOR JOSEPHSON JUNCTIONS

Shiro Kawabata

Foundations of Quantum Mechanics in the Light of New Technology•Jun 1, 2006•0 citations

Macroscopic Quantum Tunneling in d -Wave YBa2Cu3O7−δ Josephson Junctions

Thilo Bauch, Floriana Lombardi, Francesco Tafuri +4 more

The escape rate from the zero voltage state in a superconducting Josephson junction (JJ) is determined by the temperature, but it saturates at low temperature due to macroscopic quantum tunneling (MQT). Complications due to d-wave symmetry in a high temperature superconductor, like low energy quasiparticles and an unconventional current-phase relation, may influence the escape rate. We report, for the first time to our knowledge, the observation of MQT in a YBa(2)Cu(3)O(7-delta) grain boundary biepitaxial JJ. This proves that dissipation can be significantly reduced by a proper junction configuration, which is of significance for quantum coherence.

Physical Review Letters•Mar 3, 2005•158 citations

Macroscopic quantum tunneling in differently loaded Josephson junctions

Anedio Ranfagni, Daniela Mugnai

Physics Letters A•Jun 1, 2014•3 citations
This paper discusses the observation of quantum effects in the macroscopic system of a Josephson tunnel junction. The macroscopic degree of freedom is the phase difference delta between the phases of the order parameters in the two superconductors on either side of the tunnel barrier. As we shall see, the anharmonicity enables us to observe the quantized energy levels because they are no longer equally spaced, and to observe the zero point motion by the demonstration that the system tunnels out of its initial state. 6 refs., (LSP)
The escape rate from the zero voltage state in a superconducting Josephson junction (JJ) is determined by the temperature, but it saturates at low temperature due to macroscopic quantum tunneling (MQT). Complications due to d-wave symmetry in a high temperature superconductor, like low energy quasiparticles and an unconventional current-phase relation, may influence the escape rate. We report, for the first time to our knowledge, the observation of MQT in a YBa(2)Cu(3)O(7-delta) grain boundary biepitaxial JJ. This proves that dissipation can be significantly reduced by a proper junction configuration, which is of significance for quantum coherence.