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Researchers have identified a critical bottleneck in quantum scaling where material defects, rather than circuit design, are now the primary source of qubit decoherence. This "structure-coherence problem" necessitates a shift toward advanced materials science to address atomic-scale imperfections in superconducting circuits and two-dimensional materials. Solving these fundamental issues is essential for building reliable, large-scale quantum processors beyond current performance limits.

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Researchers Link Defects to Loss of Qubit Coherence

Quantum Zeitgeist2 octombrie 20265 min de cititArticolul și perspectiva sunt în engleză.

Multi-qubit gate fidelities have now exceeded 9%, but further gains are not coming from better circuits alone. Instead, progress demands attention shift towards imperfections within the very building blocks of these devices, uncontrolled surfaces, buried interfaces and unidentified defects. Understanding and systematically addressing this ‘structure-coherence problem’ is now essential to scaling quantum technologies effectively.

Quantum information science has entered its second phase, enabling more complex computations and sensing technologies than previously possible. This new era demands advances in materials science as limitations now stem less from device design and increasingly from poorly defined material properties across multiple platforms including superconducting circuits and two-dimensional materials. More powerful quantum computers are now constrained not by design but by imperfections within constituent materials; this ‘structure-coherence problem’ affects various types of hardware including superconducting circuits and two-dimensional materials. These limitations arise from poorly understood atomic-scale surfaces,…

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