SUPERCONDUCTING QUBITS PROTECTED AGAINST PHOTON-ASSISTED QUASIPARTICLE POISONING
Inventors: Robert McDermott
UW Madison researchers have devised an optimization method to minimize quasi-particle (QP) induced errors in superconducting qubits. Their recent findings show that QPs are produced by resonant absorption of high-frequency radiation that can break Cooper pairs. The qubit island structure acts as an antenna with a resonant frequency above the superconducting gap, providing an efficient means for pairbreaking photons to interconvert to QPs at the location of the junction, where the impact on qubit performance is greatest.
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