Fractional revivals and quantum entanglement via coupled angular momenta
Wai Hong Chan, C. K. Law · Physical Review A · 2006
We examine the entanglement dynamics generated by two coupled angular momenta. For initially spin-coherent states, we show that fractional revivals can lead to a well-defined sequence of fractional disentanglements, at which the purity of each subsystem is almost a fractional number $1∕n$ (where $n$ is an integer). This interesting effect is interpreted as the formation of entangled macroscopic superposition states.