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TechPulse take: This theoretical study advances the modeling of supercurrents in superconducting nanojunctions by addressing regimes with barrier transmissions below unity. By deriving an effective Hamiltonian that accounts for long-term evolution and decoherence, the work refines predictions for coherent oscillations driven by Andreev states. These insights are critical for optimizing quantum circuits where precise control of weak links is essential for maintaining coherence in future quantum devices.

Source coveringQuantum Zeitgeist

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Supercurrents oscillate with quantum interference in nanojunctions

Quantum ZeitgeistAugust 30, 20266 min read

A new theory details how quantum interference of Andreev states impacts supercurrents in superconducting nanojunctions, revealing coherent oscillations with barrier transmissions below unity.

Mikhail Kalenkov of the I.E.Tamm Department of Theoretical Physics, P.N.Lebedev Physical Institute, and Andrei Zaikin of the same institute, alongside National Research University Higher School of Economics, have demonstrated that superconducting nanojunctions with barrier transmissions slightly below unity exhibit pronounced, coherent oscillations of the supercurrent as a function of the Josephson phase. The researchers derived an effective Hamiltonian to model quantum dynamics, then solved a Schrödinger-like equation to obtain wave functions for Andreev levels and evaluate electric current. This work expands understanding beyond full-transmission junctions, offering insights into systems with diffusive barriers and refining existing models of quantum current flow. Researchers Mikhail S. Zaikin of the I.E.Tamm Department of…

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