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Microwave-based arbitrary cphase gates for transmon qubits



George S. Barron, Fernando A. Calderon-Vargas, Junling Long, David P. Pappas, Sophia E. Economou


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 nonmaximally 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 100ns.
Physical Review B


superconducting transmon qubits, quantum computing, quantum simulation, nonmaximally entangling, arbitrary cphase gates, analytically solvable approach, pulse protocols


Barron, G. , Calderon-Vargas, F. , Long, J. , Pappas, D. and Economou, S. (2020), Microwave-based arbitrary cphase gates for transmon qubits, Physical Review B, [online],, (Accessed July 13, 2024)


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Created January 16, 2020, Updated October 12, 2021