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Calcium compounds, Copper compounds, High temperature superconductors, Quantum theory, Qubits, Strontium compounds, Van der Waals forces, quantum dot, Atomically sharp interface, Charge noise, Cooper-pair tunneling, Cuprates, Current-phase relations, Josephson-junction, Order parameter, Superconducting qubits, Twist angles, Van der Waal, article, controlled study, drug therapy, superconductor, Bismuth compounds
Abstract:
Van-der-Waals assembly enables the fabrication of novel Josephson junctions featuring an atomically sharp interface between two exfoliated and relatively twisted Bi2Sr2CaCu2O8+x (Bi2212) flakes. In a range of twist angles around 45°, the junction provides a regime where the interlayer two-Cooper pair tunneling dominates the current-phase relation. Here we propose employing this novel junction to realize a capacitively shunted qubit that we call flowermon. The d-wave nature of the order parameter endows the flowermon with inherent protection against charge-noise-induced relaxation and quasiparticle-induced dissipation. This inherently protected qubit paves the way to a new class of high-coherence hybrid superconducting quantum devices based on unconventional superconductors. © 2024 American Physical Society.
