380 citations · 3.2k across the 80 of their papers we have counts for
5 papers · 1 filter
Superconducting tetrahedral quantum bits
M. V. Feigel'man, L. B. Ioffe, V. B. Geshkenbein +2
We propose a new design for a quantum bit with four superconducting islands in the topology of a symmetric tetrahedron, uniformly frustrated with one-half flux-quantum per loop and…
Theory of 4e versus 2e supercurrent in frustrated Josepshon-junction rhombi chain
Ivan V. Protopopov, Mikhail V. Feigel'man
We consider a chain of Josepshon-junction rhombi (proposed originally in \cite{Doucot}) in quantum regime, and in the realistic case when charging effects are determined by junctio…
Coulomb Effects in Nanoscale SINIS Junction
P. M. Ostrovsky, M. V. Feigel'man
We study the system of two superconductors connected by a small normal grain. We consider the modification of the Josephson effect by the Coulomb interaction on the grain. Coherent…
Quantum percolation in granular metals
M. V. Feigel'man, A. S. Ioselevich, M. A. Skvortsov
Theory of quantum corrections to conductivity of granular metal films is developed for the realistic case of large randomly distributed tunnel conductances. Quantum fluctuations of…
Protected Qubits and Chern Simons theories in Josephson Junction Arrays
B. Doucot, M. V. Feigel'man, L. B. Ioffe +1
We present general symmetry arguments that show the appearance of doubly denerate states protected from external perturbations in a wide class of Hamiltonians. We construct the sim…