Quantum entanglement distribution with hybrid parity gate
Feng Mei, Ya‐Fei Yu, Xun‐Li Feng, Zhi‐Ming Zhang, C. H. Oh · Physical Review A · 2010
We propose a scheme for entanglement distribution among different single atoms trapped in separated cavities. In our scheme, by reflecting an input coherent optical pulse from a cavity with a single trapped atom, a controlled phase-shift gate between the atom and the coherent optical pulse is achieved. Based on this gate and homodyne detection, we construct an $n$-qubit parity gate and show its use for the distribution of a large class of entangled states in one shot, including the GHZ state $|{\mathrm{GHZ}}_{n}\ensuremath{\rangle}$, $W$ state $|{W}_{n}\ensuremath{\rangle}$, Dicke state $|{D}_{n,k}\ensuremath{\rangle}$, and certain sums of Dicke states $|{G}_{n,k}\ensuremath{\rangle}$. We also show that such a distribution could be performed with high success probability and high fidelity even in the presence of channel loss.