6533b833fe1ef96bd129c15a
RESEARCH PRODUCT
Concentric transmon qubit featuring fast tunability and an anisotropic magnetic dipole moment
Hannes RotzingerDavid P. PappasLukas GrünhauptAmadeus DieterSteffen SchlörAndre SchneiderAlexander LukashenkoJochen BraumüllerAlexey V. UstinovAlexey V. UstinovMartin SandbergMichael R. VissersMartin WeidesMartin WeidesMichael Marthalersubject
SuperconductivityPhysicsQuantum PhysicsPhysics and Astronomy (miscellaneous)Magnetic momentCondensed Matter - SuperconductivityFOS: Physical sciencesQuantum simulator02 engineering and technologyTransmon021001 nanoscience & nanotechnology01 natural sciences3. Good healthSuperconductivity (cond-mat.supr-con)Quantum circuitComputer Science::Emerging TechnologiesPlanarQuantum electrodynamicsQubit0103 physical sciencesQuantum Physics (quant-ph)010306 general physics0210 nano-technologyCoherence (physics)description
We present a planar qubit design based on a superconducting circuit that we call concentric transmon. While employing a straightforward fabrication process using Al evaporation and lift-off lithography, we observe qubit lifetimes and coherence times in the order of 10us. We systematically characterize loss channels such as incoherent dielectric loss, Purcell decay and radiative losses. The implementation of a gradiometric SQUID loop allows for a fast tuning of the qubit transition frequency and therefore for full tomographic control of the quantum circuit. Due to the large loop size, the presented qubit architecture features a strongly increased magnetic dipole moment as compared to conventional transmon designs. This renders the concentric transmon a promising candidate to establish a site-selective passive direct Z coupling between neighboring qubits, being a pending quest in the field of quantum simulation.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2015-09-26 | Applied Physics Letters |