The path to high fidelity multi-qubit gates for quantum dot spin qubits
ORAL
Abstract
Spin qubits in silicon quantum dots are a promising platform for quantum computation due to long decoherence times and fast operations. Demonstrations of single qubit gates show fidelities up to 99.9% [1] and two-qubit gates show fidelities of 92-98% [1,2]. These two-qubit gate implementations are not robust against low-frequency charge noise, which couples in via the exchange interaction. Furthermore, the limited bandwidth of the signals, diabatic errors, and microwave-crosstalk are additional error sources which have to be considered.
We show that advanced pulse shaping techniques commonly used for superconducting qubits [3] can be used to significantly improve the fidelities and the quality factor of gate operations. Furthermore, we propose a simple yet effective scheme for a decoupled version of a driven exchange gate [4] that is resilient against low-frequency charge noise. We use analytic calculations and numerical simulations under realistic conditions to verify gate fidelities greater than 99.9%, which allow for fault-tolerant gates.
[1] Huang et al., Nature (London) 569, 532 (2019)
[2] Xu et al., Phys. Rev. X 9, 021011 (2019)
[3] Motzoi et al., Phys. Rev. Lett. 103, 110501 (2009)
[4] Sigillito et al., npj Quantum Information 5 (1), 1 (2019)
We show that advanced pulse shaping techniques commonly used for superconducting qubits [3] can be used to significantly improve the fidelities and the quality factor of gate operations. Furthermore, we propose a simple yet effective scheme for a decoupled version of a driven exchange gate [4] that is resilient against low-frequency charge noise. We use analytic calculations and numerical simulations under realistic conditions to verify gate fidelities greater than 99.9%, which allow for fault-tolerant gates.
[1] Huang et al., Nature (London) 569, 532 (2019)
[2] Xu et al., Phys. Rev. X 9, 021011 (2019)
[3] Motzoi et al., Phys. Rev. Lett. 103, 110501 (2009)
[4] Sigillito et al., npj Quantum Information 5 (1), 1 (2019)
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Presenters
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Maximilian Russ
Delft University of Technology, Qutech, Delft University of Technology, QuTech and Kavli Institute of Nanoscience, Delft University of Technology
Authors
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Maximilian Russ
Delft University of Technology, Qutech, Delft University of Technology, QuTech and Kavli Institute of Nanoscience, Delft University of Technology
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Stephan Philips
Delft University of Technology, Qutech, Delft University of Technology
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Lieven Vandersypen
Delft University of Technology, Qutech and Kavli Institute of Nanoscience, Delft University of Technology, QuTech, Delft University of Technology, QuTech and Kavli Institute of Nanoscience, Delft University of Technology, Qutech, Delft University of Technology