Journal
PHYSICAL REVIEW LETTERS
Volume 110, Issue 15, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.150502
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Funding
- NSF
- Office of the Director of National Intelligence (ODNI), Intelligence Advanced Research Projects Activity (IARPA), through Army Research Office [W911NF-09-1-0375]
- Elings Postdoctoral Fellowship
- Rubicon program of the Netherlands Organisation for Scientific Research
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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 P-e. By injecting hot quasiparticles into a qubit, we experimentally measure an increase of P-e in semiquantitative agreement with the model and rule out the typically assumed thermal distribution. DOI: 10.1103/PhysRevLett.110.150502
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