Knitting entanglement: assembling photonic states with delay lines

The generation of entanglement between more than two particles is a major challenge of all physical realizations It is required for the realization of many quantum information protocols including quantum computing Single photons are one of the most promising realizations of quantum bits qubits as they are easily manipulated and preserve their coherence for long times Quantum information can be stored in many different degrees of freedom of the photons Only recently eight photons wer