Kavli Affiliate: Noah Kurinsky
| First 5 Authors: Robin Anthony-Petersen, Andreas Biekert, Raymond Bunker, Clarence L. Chang, Yen-Yung Chang
| Summary:
The performance of superconducting qubits is degraded by a poorly
characterized set of energy sources breaking the Cooper pairs responsible for
superconductivity, creating a condition often called “quasiparticle
poisoning". Both superconducting qubits and low threshold dark matter
calorimeters have observed excess bursts of quasiparticles or phonons that
decrease in rate with time. Here, we show that a silicon crystal glued to its
holder exhibits a rate of low-energy phonon events that is more than two orders
of magnitude larger than in a functionally identical crystal suspended from its
holder in a low-stress state. The excess phonon event rate in the glued crystal
decreases with time since cooldown, consistent with a source of phonon bursts
which contributes to quasiparticle poisoning in quantum circuits and the
low-energy events observed in cryogenic calorimeters. We argue that relaxation
of thermally induced stress between the glue and crystal is the source of these
events.
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