Quadrupolar Exchange-Only Spin Qubit

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 de...

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Bibliographic Details
Published in:Physical review letters 2018-10, Vol.121 (17), p.177701-177701, Article 177701
Main Authors: Russ, Maximilian, Petta, J R, Burkard, Guido
Format: Article
Language:English
Subjects:
Exchanging
Noise
Noise reduction
Noise sensitivity
Nuclear spin
Quantum dots
Quantum theory
Qubits (quantum computing)
Variations
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.121.177701