3D Multimode Cavity QED

Scalable quantum computing architectures require many long-lived and highly coherent, yet easily addressable quantum states. Photonic qubits in 3D superconducting microwave cavities are a promising approach because they are highly insensitive to decoherence and single photon lifetimes exceeding 10 ms have been demonstrated$\footnote{M. Reagor, Appl. Phys. Lett. \textbf{102}, 192604 (2013) }$. However, the plurality of current 3D cavity devices are engineered to address single photon modes. In this talk, we introduce our implementation of a multimode 3D cavity that can store greater than 20 distinct, long-lived photon modes. To perform single- and two-qubit gates between photons, each of the modes are coupled to a single flux-tunable superconducting transmon qubit. We will discuss our preliminary results towards a controlled phase gate between any pair of photons modes. This multimode circuit QED architecture may also be used as a many-body bosonic system for quantum simulation, to study multimode quantum optics, and for quantum memories as part of a larger quantum network.