Transmon qubit with relaxation time exceeding 0.5 milliseconds

Abstract

By using the dry etching process of tantalum (Ta) film, we had obtained transmon qubit with the best lifetime (T1) 503 us, suggesting that the dry etching process can be adopted in the following multi-qubit fabrication with Ta film. We also compared the relaxation and coherence times of transmons made with different materials (Ta, Nb and Al) with the same design and fabrication processes of Josephson junction, we found that samples prepared with Ta film had the best performance, followed by those with Al film and Nb film. We inferred that the reason for this difference was due to the different loss of oxide materials located at the metal-air interface.

References in corpus (25)

• Supplementary information for "Quantum supremacy using a programmable superconducting processor"
• Charge insensitive qubit design derived from the Cooper pair box
• Hardware-efficient Variational Quantum Eigensolver for Small Molecules and Quantum Magnets
• Logic gates at the surface code threshold: Superconducting qubits poised for fault-tolerant quantum computing
• Superconducting Qubits: Current State of Play
• Observation of high coherence in Josephson junction qubits measured in a three-dimensional circuit QED architecture
• Dynamical decoupling and noise spectroscopy with a superconducting flux qubit
• Fluxonium: single Cooper pair circuit free of charge offsets
• Coherent Josephson qubit suitable for scalable quantum integrated circuits
• Hartree-Fock on a superconducting qubit quantum computer
• The Flux Qubit Revisited to Enhance Coherence and Reproducibility
• New material platform for superconducting transmon qubits with coherence times exceeding 0.3 milliseconds
• Towards understanding two-level-systems in amorphous solids -- Insights from quantum circuits
• Fluctuations of Energy-Relaxation Times in Superconducting Qubits
• High Kinetic Inductance Superconducting Nanowire Resonators for Circuit QED in a Magnetic Field
• Low-decoherence flux qubit
• Improved superconducting qubit coherence using titanium nitride
• Impact of ionizing radiation on superconducting qubit coherence
• Investigation of microwave loss induced by oxide regrowth in high-Q Nb resonators
• Investigating surface loss effects in superconducting transmon qubits
• Enhanced coherence of all-nitride superconducting qubits epitaxially grown on silicon substrate
• Bulk and surface loss in superconducting transmon qubits
• Oxygen stoichiometry and instability in aluminium oxide tunnel barrier layers
• Implementation of a transmon qubit using superconducting granular aluminum
• Vacuum-gap transmon qubits realized using flip-chip technology

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