Three-Phase Topological Superconducting Diode Effect

forthcoming

Quantum computers promise unprecedented computational power, yet the lack of scalable, reliable quantum circuit components remains a major bottleneck to realizing practical quantum processors. A single error in a quantum circuit can corrupt an entire computation, so fault tolerance is essential to truly unlock quantum advantage. Here, topological qubits offer a leading pathway to fault-tolerant quantum computation, but their integration is currently hindered by the lack of essential directional elements. We address this gap with a novel three-phase topological superconducting diode that provides dissipationless, fully integrable directional control within topological materials. Our approach is compatible with existing superconductor and nanofabrication processes, requires only minimal magnetic fields, and can be integrated seamlessly into topological quantum processors. It enables scalable, energy-efficient quantum circuits that preserve coherence, eliminate bulky external components, and unlock seamless integration of Majorana-based qubits into functional processors. Our technology lowers error rates and cuts error-correction overhead, and may offer scalable, energy-efficient, and commercially viable circuits. Our PoC will reach TRL 4 by combining real-material simulations with experimental validation, optimizing three-phase control for reliable cryogenic operation within standard superconducting fabrication processes, while simultaneously defining the exploitation pathway and commercialization strategy. This PoC is a pivotal step toward practical quantum processors, providing a directional superconducting element for topological and superconducting qubit architectures