We propose a realizable architecture using one-dimensional transmission lineresonators to reach the strong coupling limit of cavity quantum electrodynamicsin superconducting electrical circuits. The vacuum Rabi frequency for thecoupling of cavity photons to quantized excitations of an adjacent electricalcircuit (qubit) can easily exceed the damping rates of both the cavity and thequbit. This architecture is attractive both as a macroscopic analog of atomicphysics experiments and for quantum computing and control, since it providesstrong inhibition of spontaneous emission, potentially leading to greatlyenhanced qubit lifetimes, allows high-fidelity quantum non-demolitionmeasurements of the state of multiple qubits, and has a natural mechanism forentanglement of qubits separated by centimeter distances. In addition it wouldallow production of microwave photon states of fundamental importance forquantum communication.
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