Single-tone pulse sequences and robust two-tone shaped pulses for three silicon spin qubits with always-on exchange
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2021-06-22
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Kanaar, David W. et al.; Single-tone pulse sequences and robust two-tone shaped pulses for three silicon spin qubits with always-on exchange; Physical Review B, 103, 235314, 22 June, 2021; https://doi.org/10.1103/PhysRevB.103.235314
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Abstract
Quantum computation requires high-fidelity single-qubit and two-qubit gates on a scalable platform. Silicon spin qubits are a promising platform toward realization of this goal. In this paper we show how to perform single-qubit and controlled-Z (cz) gates in a linear chain of three spin qubits with always-on exchange coupling, which is relevant for certain dot- and donor-based silicon devices. We also show how to make the cz gate robust against both charge noise and pulse length error using a two-tone pulse shaping method. The robust pulse maintains a fidelity of 99.99% at 3.5% fluctuations in exchange or pulse amplitude, which is an improvement over the uncorrected pulses where this fidelity can only be maintained for fluctuations in exchange up to 2% or up to 0.2% in amplitude.