Forget this talk (joint work with Peter Shor)
Erasing correlations and destroying entanglement can be valuable resources for quantum communication. First I'll define coherent erasure as the time reversal of coherent classical communication, and will use this idea to give the first separations of forward and backward communication capacity for unitary gates. Next, I'll give an example---the quantum reverse Shannon theorem---of why it's helpful to be able to coherently destroy entanglement. I'll end with ideas about how to incorporate these new tasks into the traditional resource framework. Based on quant-ph/0511219.