Effects of charge noise on a pulse-gated singlet-triplet qubit

We study the dynamics of a pulse-gated semiconductor double quantum dot qubit. In our experiments, the qubit coherence times are relatively long, but the visibility of the quantum oscillations is low. We show that these observations are consistent with a theory that incorporates decoherence arising from charge noise that gives rise to detuning fluctuations of the double dot.


Read the full article at: https://arxiv.org/abs/1701.06971

Quasiparticle poisoning of superconducting microwave resonators

Nonequilibrium quasiparticles represent a significant source of decoherence in superconducting quantum circuits. Here we investigate the mechanism of quasiparticle poisoning in devices subjected to local quasiparticle injection.

Read the full article at: https://arxiv.org/abs/1610.09351