Universal high-fidelity quantum gates for spin qubits in diamond
H. P. Bartling (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - Quantum Internet Division)
J. Yun (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QID/Taminiau Lab)
K. N. Schymik (TU Delft - QuTech Advanced Research Centre, TU Delft - QID/Taminiau Lab, Kavli institute of nanoscience Delft)
M. Van Riggelen (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - Applied Sciences)
L. A. Enthoven (TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/Sebastiano Lab)
H. B. Van Ommen (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - QID/Taminiau Lab)
M. Babaie (TU Delft - QCD/Babaie Lab, TU Delft - QuTech Advanced Research Centre, TU Delft - Electronics)
F. Sebastiano (TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/Sebastiano Lab, TU Delft - Quantum Circuit Architectures and Technology)
T. H. Taminiau (TU Delft - Quantum Internet Division, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)
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Abstract
Spins associated to solid-state color centers are a promising platform for investigating quantum computation and quantum networks. Recent experiments have demonstrated multiqubit quantum processors, optical interconnects, and basic quantum error-correction protocols. One of the key open challenges towards larger-scale systems is to realize high-fidelity universal quantum gates. In this work, we design and demonstrate a complete high-fidelity gate set for the two-qubit system formed by the electron and nuclear spin of a nitrogen-vacancy center in diamond. We use gate set tomography (GST) to systematically optimize the gates and demonstrate single-qubit gate fidelities of up to 99.999(1)% and a two-qubit gate fidelity of 99.93(5)%. Our gates are designed to decouple unwanted interactions and can be extended to other electron-nuclear spin systems. The high fidelities demonstrated provide opportunities towards larger-scale quantum processing with color-center qubits.
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