We consider the implementation of an arbitrary unitary operation U upon a d
istant quantum system. This teleportation of U can be viewed as quantum rem
ote control. We investigate protocols that achieve this using local operati
ons, classical communication, and shared entanglement. Lower bounds on the
necessary entanglement and classical communication are determined using cau
sality and the linearity of quantum mechanics. We examine in particular det
ail the resources required if the remote control is to be implemented as a
classical black box. Under these circumstances, we prove that the required
resources are, necessarily, those needed for implementation by bidirectiona
l state teleportation.