Coherence in a transmon qubit with epitaxial tunnel junctions

Details Coherence in a transmon qubit with epitaxial tunnel junctions Coherence in a transmon qubit with epitaxial tunnel junctions

2011-11-22

arxiv.org/abs/1111.5083v3

Appl. Phys. Lett. 99, 262502 (2011)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1063/1.3672000

We developed transmon qubits based on epitaxial tunnel junctions and interdigitated capacitors. This multileveled qubit, patterned by use of all-optical lithography, is a step towards scalable qubits with a high integration density. The relaxation time T1 is .72-.86mu sec and the ensemble dephasing time T2 is slightly larger than T1. The dephasing time T2 (1.36mu sec) is nearly energy-relaxation-limited. Qubit spectroscopy yields weaker level splitting than observed in qubits with amorphous barriers in equivalent-size junctions. The qubit's inferred microwave loss closely matches the weighted losses of the individual elements (junction, wiring dielectric, and interdigitated capacitor), determined by independent resonator measurements.

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