2003/01/31 by Mun Dae Kim, Dongkwan Shin, Jongbae Hong · 1 citation
Computer Science · Mathematics · Physics and Astronomy · #Andreev reflection #Condensed matter physics #Cooper pair #Coupling (piping) #Cusp (singularity) #Flux qubit #Geometry #Josephson effect #Magnetic field #Magnetic flux #Mathematics #Physics #Physics of Superconductivity and Magnetism #Pi Josephson junction #Quantum #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum mechanics #Quantum tunnelling #Qubit #Squid #Superconducting quantum computing #Superconductivity #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.68.134513
published as Phys. Rev. B 68, 134513 (2003) · 6 pages, 6 figures, version to appear in Phys. Rev. B
arxiv created 2003/08/21 · openalex publication_date 2003/10/07 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The effective potentials of the rf-SQUID and three-Josephson junction loop with a penetrating external magnetic flux are studied. Using the periodic boundary condition for the phase evolution of the wave function of Cooper pairs, we obtain new periodic potentials with cusp barriers in contrast with the usual smooth double-well potential. The tunneling through the cusp barrier becomes dominant for a parameter regime, where the self-inductance of the superconducting loop and the Josephson coupling energy are large. Calculating the tunneling frequency we see that the cusp potential may offer a more efficient qubit.