We show that entangled entanglement can be obtained from a multimode Raman laser. In this system, all lasing modes constitute a quantum-beat. Equivalently, one collective mode is operated well above threshold and exhibits the sub-Poissonian statistics, while other orthonormal collective modes are excluded from the interacting system and stay in vacuum states. This determines entanglement between any two sub-collections, in each of which exists entanglement between any two sub-sub-collections, and so on, if present. This scheme is accessible bas...
