Excitation of superconducting qubits from hot nonequilibrium quasiparticles
Superconducting qubits probe environmental defects such as nonequilibrium quasiparticles, an important source of decoherence. We show that "hot" nonequilibrium quasiparticles, with energies above the superconducting gap, affect qubits differently from quasiparticles at the gap, implying qu...
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| Veröffentlicht in: | Physical review letters 2013-04, Vol.110 (15), p.150502-150502, Article 150502 |
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| container_title | Physical review letters |
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| creator | Wenner, J Yin, Yi Lucero, Erik Barends, R Chen, Yu Chiaro, B Kelly, J Lenander, M Mariantoni, Matteo Megrant, A Neill, C O'Malley, P J J Sank, D Vainsencher, A Wang, H White, T C Cleland, A N Martinis, John M |
| description | Superconducting qubits probe environmental defects such as nonequilibrium quasiparticles, an important source of decoherence. We show that "hot" nonequilibrium quasiparticles, with energies above the superconducting gap, affect qubits differently from quasiparticles at the gap, implying qubits can probe the dynamic quasiparticle energy distribution. For hot quasiparticles, we predict a non-negligible increase in the qubit excited state probability Pe. By injecting hot quasiparticles into a qubit, we experimentally measure an increase of Pe in semiquantitative agreement with the model and rule out the typically assumed thermal distribution. |
| doi_str_mv | 10.1103/physrevlett.110.150502 |
| format | Article |
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| title | Excitation of superconducting qubits from hot nonequilibrium quasiparticles |
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