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

• URL: http://arxiv.org/abs/2003.06768v1
• Date: Sun, 15 Mar 2020 06:26:51 GMT
• Title: Progress Towards a Capacitively Mediated CNOT Between Two Charge Qubits in Si/SiGe
• Authors: E. R. MacQuarrie and Samuel F. Neyens and J. P. Dodson and J. Corrigan and Brandur Thorgrimsson and Nathan Holman and M. Palma and L. F. Edge and Mark Friesen and S. N. Coppersmith and M. A. Eriksson
• Abstract summary: Two-qubit charge qubits are a useful tool for benchmarking device performance and exploring two-qubit dynamics. We find that a conditional $pi$-rotation can be driven in just 74 ps with a modest fidelity demonstrating the possibility of two-qubit operations with a 13.5 GHz clockspeed.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Fast operations, an easily tunable Hamiltonian, and a straightforward two-qubit interaction make charge qubits a useful tool for benchmarking device performance and exploring two-qubit dynamics. Here, we tune a linear chain of four Si/SiGe quantum dots to host two double dot charge qubits. Using the capacitance between the double dots to mediate a strong two-qubit interaction, we simultaneously drive coherent transitions to generate correlations between the qubits. We then sequentially pulse the qubits to drive one qubit conditionally on the state of the other. We find that a conditional $\pi$-rotation can be driven in just 74 ps with a modest fidelity demonstrating the possibility of two-qubit operations with a 13.5 GHz clockspeed.

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