Spin qubits in quantum dots provide a promising platform for realizing large-scale quantum processors since they have a small characteristic size (10-100 nm) [Hendrickx] compared to superconducting qubits (100 microns) [Andersen]. They also have long coherence times, high-fidelity universal quantum control and the capability of high-temperature operation. One difficulty of having e.g. a few thousand qubits on a single chip is the large number of control lines: this number scales linearly with the qubit count. A crossbar control architecture was proposed to overcome this issue, where the number of control lines scales as the square root of the qubit count [Li]. In this poster, we present a protocol to optimize single- and two-qubit gates for a crossbar array of spin qubits, we quantify crosstalk effects, and visualize them via the spatial patterns of gate infidelities.
[Hendrickx] N. W. Hendrickx et al. A four-qubit germanium quantum processor, Nature 591 (2021)
[Andersen] C. K. Andersen et al. Repeated quantum error detection in a surface code, Nature Physics 16 (2020)
[Li] R. Li et al. A crossbar network for silicon quantum dot qubits, Science Advances 4, 7 (2018)