Multiphoton cluster-state generation in the telecom C-band using an InAs/InP quantum dot

Multiphoton entangled states are essential for memoryless quantum repeaters and measurement-based quantum computation. We demonstrate, for the first time, scalable multiphoton entanglement generation directly in the telecom C-band from a solid-state system, achieving two- and three-qubit fidelities of 59.5% and 52.7%.