Single-tone pulse sequences and robust two-tone shaped pulses for three silicon spin qubits with always-on exchange

• URL: http://arxiv.org/abs/2101.08840v2
• Date: Tue, 22 Jun 2021 15:42:44 GMT
• Title: Single-tone pulse sequences and robust two-tone shaped pulses for three silicon spin qubits with always-on exchange
• Authors: David W. Kanaar, Sidney Wolin, Utkan G\"ung\"ord\"u and J. P. Kestner
• Abstract summary: We show how to perform single-qubit and CZ gates in a linear chain of three spin qubits with always-on exchange coupling. 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.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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 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.

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