Twisted superconducting quantum diodes for high fidelity anharmonic qubits
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Updated: Nov 10, 2026

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
Han Zhong1, Denis Kochan2,3, Igor Žutić4
1Department of Electrical and Computer Engineering, University of Florida, Gainesville, FL, USA.
Abstract:
In superconducting circuits, bidirectional signal propagation can cause back-reflections and back-action that couple environmental noise back to coherent elements, degrading fidelity. Nonreciprocal superconducting diodes provide an intrinsic route to suppress such back-scattering at the circuit level. However, their diode efficiency and quantum integration remain limited. Here, we realize a quantum diode in twisted NbSe2 under in-plane and out-of-plane magnetic fields. A mere 1∘ twist yields an efficiency enhancement over pristine devices, reaching 27.6%. Quantum simulations reveal that this intermediate efficiency, well below 100% ideal, is both experimentally practical and optimal for preserving qubit anharmonicity and stabilizing two-level systems. These findings show that maximal rectification is not always beneficial for quantum information, establishing a new principle for designing the fundamental properties of twisted superconductors towards low-power, high-fidelity quantum circuits.
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