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Updated: May 22, 2025

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
Quantum Coulomb Drag Mediated by Cotunneling of Fluxons and Cooper Pairs
Andrew G Semenov1,2, Alex Latyshev3, Andrei D Zaikin1,4
1P.N. Lebedev Physical Institute, I.E.Tamm Department of Theoretical Physics, 119991 Moscow, Russia.
Abstract:
We predict two novel quantum drag effects which can occur in macroscopically quantum coherent Josephson circuits. We demonstrate that biasing one resistively shunted Josephson junction by an external current one can induce a nonzero voltage drop across another such junction capacitively coupled to the first one. This quantum Coulomb drag is caused by cotunneling of magnetic flux quanta across both junctions which remain in the "superconducting" regime. Likewise, Cooper pair cotunneling across a pair of connected in series Josephson junctions in the "insulating" regime is responsible for another-dual-quantum Coulomb drag effect.
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