A fabrication technique for Josephson junctions using 3D patterned low-loss substrate enables high-quality trilayer junctions from various materials without organic contaminants or intentional oxides.
Martinis and Anthony Megrant
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abstract
We review progress at UCSB on understanding the physics of decoherence in superconducting qubits. Although many decoherence mechanisms were studied and fixed in the last 5 years, the most important ones are two-level state defects in amorphous dielectrics, non-equilibrium quasiparticles generated from stray infrared light, and radiation to slotline modes. With improved design, the performance of integrated circuit transmons using the Xmon design are now close to world record performance: these devices have the advantage of retaining coherence when scaled up to 9 qubits.
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Substrate insulated Josephson junctions for superconducting quantum circuits
A fabrication technique for Josephson junctions using 3D patterned low-loss substrate enables high-quality trilayer junctions from various materials without organic contaminants or intentional oxides.
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