Quadrupolar Exchange-Only Spin Qubit

Maximilian Russ, J. R. Petta, Guido Burkard

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


We propose a quadrupolar exchange-only spin qubit that is highly robust against charge noise and nuclear spin dephasing, the dominant decoherence mechanisms in quantum dots. The qubit consists of four electrons trapped in three quantum dots, and operates in a decoherence-free subspace to mitigate dephasing due to nuclear spins. To reduce sensitivity to charge noise, the qubit can be completely operated at an extended charge noise sweet spot that is first-order insensitive to electrical fluctuations. Because of on-site exchange mediated by the Coulomb interaction, the qubit energy splitting is electrically controllable and can amount to several GHz even in the "off" configuration, making it compatible with conventional microwave cavities.

Original languageEnglish (US)
Article number177701
JournalPhysical review letters
Issue number17
StatePublished - Oct 25 2018

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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