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We find that stray infrared light from the 4 K stage in a cryostat can causesignificant loss in superconducting resonators and qubits. For devices shieldedin only a metal box, we measured resonators with quality factors Q = 10^5 andqubits with energy relaxation times T_1=120 ns, consistent with a straylight-induced quasiparticle density of 170-230 \mu m^{-3}. By adding a secondblack shield at the sample temperature, we found about an order of magnitudeimprovement in performance and no sensitivity to the 4 K radiation. We alsotested various shielding methods, implying a lower limit of Q = 10^8 due tostray light in the light-tight configuration.

Loss and decoherence due to stray infrared light in superconducting quantum circuits