Chaniltonian Communication Capacity

We are studying the utility of two-party Hamiltonians (such as a dipole-dipole interaction) as quantum channels to be used for generating entanglement or transmitting classical or quantum information. This is a more constrained, and in many ways more physically realistic, take on the quantum channel capacity problem. In particular, we want to determine if communication capacities are always equal in both directions and to discover their relationship with entanglement-generating capacity. We have found that, analogously to general quantum channels, unlimited shared entanglement offers useful simplifications to the Hamiltonian communication problem.