TY - JOUR
T1 - On-demand electrical control of spin qubits
AU - Gilbert, Will
AU - Tanttu, Tuomo
AU - Lim, Wee Han
AU - Feng, Meng Ke
AU - Huang, Jonathan Y.
AU - Cifuentes, Jesus D.
AU - Serrano, Santiago
AU - Mai, Philip Y.
AU - Leon, Ross C.C.
AU - Escott, Christopher C.
AU - Itoh, Kohei M.
AU - Abrosimov, Nikolay V.
AU - Pohl, Hans Joachim
AU - Thewalt, Michael L.W.
AU - Hudson, Fay E.
AU - Morello, Andrea
AU - Laucht, Arne
AU - Yang, Chih Hwan
AU - Saraiva, Andre
AU - Dzurak, Andrew S.
N1 - Funding Information:
We acknowledge helpful conversations and technical support from A. Dickie. We acknowledge support from the Australian Research Council (FL190100167 and CE170100012), the US Army Research Office (W911NF-17-1-0198) and the NSW Node of the Australian National Fabrication Facility. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Office or the US Government. The US Government is authorized to reproduce and distribute reprints for Government purposes notwithstanding any copyright notation herein. W.G., M.F., J.Y.H., J.D.C. and S.S. acknowledge support from Sydney Quantum Academy.
Funding Information:
We acknowledge helpful conversations and technical support from A. Dickie. We acknowledge support from the Australian Research Council (FL190100167 and CE170100012), the US Army Research Office (W911NF-17-1-0198) and the NSW Node of the Australian National Fabrication Facility. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Office or the US Government. The US Government is authorized to reproduce and distribute reprints for Government purposes notwithstanding any copyright notation herein. W.G., M.F., J.Y.H., J.D.C. and S.S. acknowledge support from Sydney Quantum Academy.
Publisher Copyright:
© 2023, The Author(s), under exclusive licence to Springer Nature Limited.
PY - 2023/2
Y1 - 2023/2
N2 - Once called a ‘classically non-describable two-valuedness’ by Pauli, the electron spin forms a qubit that is naturally robust to electric fluctuations. Paradoxically, a common control strategy is the integration of micromagnets to enhance the coupling between spins and electric fields, which, in turn, hampers noise immunity and adds architectural complexity. Here we exploit a switchable interaction between spins and orbital motion of electrons in silicon quantum dots, without a micromagnet. The weak effects of relativistic spin–orbit interaction in silicon are enhanced, leading to a speed up in Rabi frequency by a factor of up to 650 by controlling the energy quantization of electrons in the nanostructure. Fast electrical control is demonstrated in multiple devices and electronic configurations. Using the electrical drive, we achieve a coherence time T2,Hahn ≈ 50 μs, fast single-qubit gates with Tπ/2 = 3 ns and gate fidelities of 99.93%, probed by randomized benchmarking. High-performance all-electrical control improves the prospects for scalable silicon quantum computing.
AB - Once called a ‘classically non-describable two-valuedness’ by Pauli, the electron spin forms a qubit that is naturally robust to electric fluctuations. Paradoxically, a common control strategy is the integration of micromagnets to enhance the coupling between spins and electric fields, which, in turn, hampers noise immunity and adds architectural complexity. Here we exploit a switchable interaction between spins and orbital motion of electrons in silicon quantum dots, without a micromagnet. The weak effects of relativistic spin–orbit interaction in silicon are enhanced, leading to a speed up in Rabi frequency by a factor of up to 650 by controlling the energy quantization of electrons in the nanostructure. Fast electrical control is demonstrated in multiple devices and electronic configurations. Using the electrical drive, we achieve a coherence time T2,Hahn ≈ 50 μs, fast single-qubit gates with Tπ/2 = 3 ns and gate fidelities of 99.93%, probed by randomized benchmarking. High-performance all-electrical control improves the prospects for scalable silicon quantum computing.
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U2 - 10.1038/s41565-022-01280-4
DO - 10.1038/s41565-022-01280-4
M3 - Article
C2 - 36635331
AN - SCOPUS:85146168792
SN - 1748-3387
VL - 18
SP - 131
EP - 136
JO - Nature Nanotechnology
JF - Nature Nanotechnology
IS - 2
ER -