Progress Towards a Capacitively Mediated CNOT Between Two Charge Qubits in Si/SiGe

• DOI: 10.48550/arxiv.2003.06768
• Publication Date: 2020-01-01
• Authors: E. R. MacQuarrie; Samuel F. Neyens; J. P. Dodson; J. Corrigan; Brandur Thorgrimsson; Nathan Holman; M. Palma; L. F. Edge; Mark Friesen; S. N. Coppersmith; M. A. Eriksson
• Keywords: Charge qubit; Controlled NOT gate; Flux qubit; Hamiltonian (control theory)

Fast operations, an easily tunable Hamiltonian, and a straightforward two-qubit interaction make charge qubits useful tool for benchmarking device performance exploring dynamics. Here, we tune linear chain of four Si/SiGe quantum dots to host two double dot qubits. Using the capacitance between mediate strong interaction, simultaneously drive coherent transitions generate correlations We then sequentially pulse one qubit conditionally on state other. find that conditional $\pi$-rotation can be driven in just 74 ps with modest fidelity demonstrating possibility operations 13.5 GHz clockspeed.