UCSB final report for the CSQ program: Review of decoherence and materials physics for superconducting qubits

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.

arXiv comment10 pages, 1 figure

Cited by in corpus (11)

• Materials loss measurements using superconducting microwave resonators
• Deterministic quantum teleportation between distant superconducting chips
• Millikelvin temperature cryo-CMOS multiplexer for scalable quantum device characterisation
• Quantum simulations of one dimensional quantum systems
• Ultralow 1/f Noise in a Heterostructure of Superconducting Epitaxial Cobalt-Disilicide Thin Film on Silicon
• Free-standing silicon shadow masks for transmon qubit fabrication
• Control and mitigation of microwave crosstalk effect with superconducting qubits
• Manufacturing high-Q superconducting α-tantalum resonators on silicon wafers
• Charge and flux insensitive tunable superconducting qubit
• High-quality superconducting α-Ta film sputtered on heated silicon substrate
• Design of a release-free piezo-optomechanical quantum transducer