Pan Zheng
Creating and Measuring Two-Mode Cat States
Paper Review of "A Schroedinger cat living in two boxes" Science 352, 1087 (2016)
Circuit quantum electrodynamics (QED), which has gained tremendous experimental progress over the last two decades, provides a fundamental architecture for quantum information processing. In this talk, I will present a recent paper titled “A Schrodinger cat living in two boxes” (Wang et al. 2016 Science). The authors generate a two-mode cat state of microwave fields in two 3D superconducting cavities which are coupled through the strong dispersive interaction with a transmon ancilla. They also demonstrate the full quantum state tomography of the cat state via the measurements of the joint photon number parity. The creation of the two-mode cat state as a realization of two coupled logical qubits, together with the quantum nondemolition measurement of the joint photon number parity, paves the way toward fault-tolerant quantum computation.