Entangling homogeneously broadened matter qubits in the weak-coupling cavity-QED regime

Research paper by Kazuki Koshino, Yuichiro Matsuzaki

Indexed on: 30 Apr '12Published on: 30 Apr '12Published in: Quantum Physics


In distributed quantum information processing, flying photons entangle matter qubits confined in cavities. However, when a matter qubit is homogeneously broadened, the strong-coupling regime of cavity QED is typically required, which is hard to realize in actual experimental setups. Here, we show that a high-fidelity entanglement operation is possible even in the weak-coupling regime in which dampings (dephasing, spontaneous emission, and cavity leakage) overwhelm the coherent coupling between a qubit and the cavity. Our proposal enables distributed quantum information processing to be performed using much less demanding technology than previously.