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Although Josephson junction qubits show great promise for quantum computing,the origin of dominant decoherence mechanisms remains unknown. We report Rabioscillations for an improved phase qubit, and show that their coherenceamplitude is significantly degraded by spurious microwave resonators. Theseresonators arise from changes in the junction critical current produced bytwo-level states in the tunnel barrier. The discovery of these high frequencyresonators impacts the future of all Josephson qubits as well as existingJosephson technologies. We predict that removing or reducing these resonatorsthrough materials research will improve the coherence of all Josephson qubits.Comment: Submitted to Physical Review Letter

Decoherence in Josephson Phase Qubits from Junction Resonators