Experimental Entanglement and Nonlocality of a Two-Photon Six-Qubit Cluster State
Raino Ceccarelli, Giuseppe Vallone, F. De Martini, Paolo Mataloni, Adán Cabello · Physical Review Letters · 2009
We create a six-qubit linear cluster state by transforming a two-photon hyperentangled state in which three qubits are encoded in each particle, one in the polarization and two in the linear momentum degrees of freedom. For this state, we demonstrate genuine six-qubit entanglement, persistency of entanglement against the loss of qubits, and higher violation than in previous experiments on Bell inequalities of the Mermin type.