Entangled Coherent States B. C. Sanders Entangled Coherent States Coherent states of light describe the classical coherent states of light in a quantum framework.
Coherent states are minimum uncertainty states generated by a classical current distribution.
Moreover, classical states of light are those which are diagonal in the coherent state representation. The Schroedinger cat states are superpositions of distinct coherent states for a system with one degree of freedom. However, a superposition of coherent states with two degrees of freedom offers a much richer range of phenomena to be investigated, including wavepacket collapse and entanglement. The entanglement is the most interesting feature, and, for this reason, the superposition of coherent states in two or more degrees of freedom are referred to as entangled coherent states. More generally we are studying entangled nonorthogonal states of which entangled coherent states present a fascinating and often counter-intuitive special case.