Coherent Josephson qubit suitable for scalable quantum integrated circuits

Abstract

We demonstrate a planar, tunable superconducting qubit with energy relaxation times up to 44 microseconds. This is achieved by using a geometry designed to both minimize radiative loss and reduce coupling to materials-related defects. At these levels of coherence, we find a fine structure in the qubit energy lifetime as a function of frequency, indicating the presence of a sparse population of incoherent, weakly coupled two-level defects. This is supported by a model analysis as well as experimental variations in the geometry. Our `Xmon' qubit combines facile fabrication, straightforward connectivity, fast control, and long coherence, opening a viable route to constructing a chip-based quantum computer.

10 pages, 9 figures, including supplementary material

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• Quantum coherence between cavity and artificial atom in a superconducting circuit QED ladder system
• Non-Markovianity Benefits Quantum Dynamics Simulation
• From Quantum Optics to Quantum Technologies
• Work-sharing of qubits in topological error corrections
• Simulated Randomized Benchmarking of a Dynamically Corrected Cross-Resonance Gate
• Floquet dynamics of disordered bands with isolated critical energies
• Low Overhead Quantum Bus with Coupling beyond the Nearest Neighbor via Mediated Effective Capacitance
• Multi-target-qubit unconventional geometric phase gate in a multi-cavity system
• Review of Superconducting Qubit Devices and Their Large-Scale Integration
• Macroscopic quantum phenomena and quantum computing