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We present a superconducting qubit design that is fabricated in a 2D geometryover a superconducting ground plane to enhance the lifetime. The qubit iscoupled to a microstrip resonator for readout. The circuit is fabricated on asilicon substrate using low loss, stoichiometric titanium nitride for capacitorpads and small, shadow-evaporated aluminum/aluminum-oxide junctions. We observequbit relaxation and coherence times ($T_1$ and $T_2$) of 11.7 $\pm$ 0.2 $\mu$sand 8.7 $\pm$ 0.3 $\mu$s, respectively. Calculations show that the proximity ofthe superconducting plane suppresses the otherwise high radiation loss of thequbit. A significant increase in $T_1$ is projected for a reducedqubit-to-superconducting plane separation.

Long-lived, radiation-suppressed superconducting quantum bit in a planar geometry