Demonstration of Local Expansion Toward Large-Scale Entangled Webs
Demonstration of Local Expansion Toward Large-Scale Entangled Webs
We demonstrate an optical gate that increases the size of polarization-based W states by accessing only one of the qubits. Using this gate, we have generated three-photon and four-photon W states with fidelities 0.836 ± 0.042 and 0.784 ± 0.028, respectively. We also confirmed the existence of pairwise entanglement in …