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