Nonclassicality of coherent states: Entanglement of joint statistics

Alfredo Luis, Laura Monroy
2017 Physical Review A  
Simple joint measurements of pairs of observables reveal that states considered universally as classical-like, such as SU(2) spin coherent states, Glauber coherent states, and thermal states are actually nonclassical. We show that this holds because we can find a joint measurement the statistics of which is not separable. Eventually this may be extended to all states different from the maximally mixed state.
doi:10.1103/physreva.96.063802 fatcat:mq6lap4o3vhntcw34ikmunax4q