A simple all-microwave entangling gate for fixed-frequency superconducting qubits

Physics – Quantum Physics

Scientific paper

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Scientific paper

10.1103/PhysRevLett.107.080502

We demonstrate an all-microwave two-qubit gate on superconducting qubits which are fixed in frequency at optimal bias points. The gate requires no additional subcircuitry and is tunable via the amplitude of microwave irradiation on one qubit at the transition frequency of the other. We use the gate to generate entangled states with a maximal extracted concurrence of 0.88 and quantum process tomography reveals a gate fidelity of 81%.

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