Abstract
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 language | English (US) |
|---|---|
| Article number | 177701 |
| Journal | Physical review letters |
| Volume | 121 |
| Issue number | 17 |
| DOIs | |
| State | Published - Oct 25 2018 |
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
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In: Physical review letters, Vol. 121, No. 17, 177701, 25.10.2018.
Research output: Contribution to journal › Article › peer-review
TY - JOUR
T1 - Quadrupolar Exchange-Only Spin Qubit
AU - Russ, Maximilian
AU - Petta, J. R.
AU - Burkard, Guido
N1 - Funding Information: In summary, we have proposed a quadrupolar exchange spin qubit that uses the spin of four electrons in a TQD and gives rise to a large controllable qubit splitting. The decoherence-free ( S = 0 ) qubit encoding makes the qubit insensitive to local magnetic field gradients primarily from nuclear spins and Meissner expulsion. Further, the large energy gap and flat qubit dispersion suppresses the susceptibility to charge noise and the qubit can be fully operated at a (extended) charge noise sweet spot. We predict dephasing times exceeding ∼ 100 μ s at the sweet spot, one order of magnitude longer than for the conventional exchange-only qubit, allowing for a high quality qubit implementation. A symmetric readout and initialization protocol can be used to perform fast and high-fidelity measurements. Together with the proposed cavity-mediated, long-distance entangling protocol, these properties render the QUEX qubit suitable for implementation in a large-scale quantum information processing architecture. We acknowledge funding from ARO through Grant No. W911NF-15-1-0149 and the DFG through SFB 767. We thank M. Benito and J. M. Taylor for helpful discussions. [1] 1 M. Veldhorst , C. H. Yang , J. C. C. Hwang , W. Huang , J. P. Dehollain , J. T. Muhonen , S. Simmons , A. Laucht , F. E. Hudson , K. M. Itoh , A. Morello , and A. S. Dzurak , Nature (London) 526 , 410 ( 2015 ). NATUAS 0028-0836 10.1038/nature15263 [2] 2 J. Yoneda , K. Takeda , T. Otsuka , T. Nakajima , M. R. Delbecq , G. Allison , T. Honda , T. Kodera , S. Oda , Y. Hoshi , N. Usami , K. M. Itoh , and S. Tarucha , Nat. Nanotechnol. 13 , 102 ( 2018 ). NNAABX 1748-3387 10.1038/s41565-017-0014-x [3] 3 D. M. Zajac , A. J. Sigillito , M. Russ , F. Borjans , J. M. Taylor , G. Burkard , and J. R. 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PY - 2018/10/25
Y1 - 2018/10/25
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevLett.121.177701
DO - 10.1103/PhysRevLett.121.177701
M3 - Article
C2 - 30411952
AN - SCOPUS:85055674686
SN - 0031-9007
VL - 121
JO - Physical review letters
JF - Physical review letters
IS - 17
M1 - 177701
ER -