Simple All-Microwave Entangling Gate for Fixed-Frequency Superconducting Qubits
Jerry M. Chow, Antonio D. Corcoles, Jay Gambetta, Chad T. Rigetti, Blake Johnson, John A. Smolin, John Rozen, George Keefe, Mary Beth Rothwell, M. B. Ketchen, Matthias Steffen · Physical Review Letters · 2011
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%.