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arXiv · 1903.00969

Microwave-based Arbitrary CPHASE Gates for Transmon Qubits

George S. Barron·F. A. Calderon-Vargas·Junling Long·David Pappas·Sophia E. Economou
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Abstract

Superconducting transmon qubits are of great interest for quantum computing and quantum simulation. A key component of quantum chemistry simulation algorithms is breaking up the evolution into small steps, which naturally leads to the need for non-maximally entangling, arbitrary CPHASE gates. Here we design such microwave-based gates using an analytically solvable approach leading to smooth, simple pulses. We use the local invariants of the evolution operator in $SU(4)$ to develop a method of constructing pulse protocols, which allows for the continuous tuning of the phase. We find CPHASE fidelities of more than $0.999$ and gate times as low as $100\text{ ns}$.

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George S. Barron, F. A. Calderon-Vargas, Junling Long, David Pappas, Sophia E. Economou. 2019-03-03. Microwave-based Arbitrary CPHASE Gates for Transmon Qubits. https://doi.org/10.1103/physrevb.101.054508

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