Using Sideband Transitions for Two-Qubit Operations in Superconducting Circuits

Understand

We demonstrate time resolved driving of two-photon blue sideband transitions between superconducting qubits and a transmission line resonator.

• Using the sidebands, we implement a pulse sequence that first entangles one qubit with the resonator, and subsequently distributes the entanglement between two qubits.
• We show generation of 75% fidelity Bell states by this method.
• The full density matrix of the two qubit system is extracted using joint measurement and quantum state tomography, and shows close agreement with numerical simulation.