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We show that a quantum clock cannot be teleported without priorsynchronization between sender and receiver: every protocol using a finiteamount of entanglement and an arbitrary number of rounds of classicalcommunication will necessarily introduce an error in the teleported state ofthe clock. Nevertheless, we show that entanglement can be used to achievesynchronization with precision higher than any classical correlation allows,and we give the optimized strategy for this task. The same results hold alsofor arbitrary continuous quantum reference frames, which encode generalunspeakable information,-information that cannot be encoded into a number, butinstead requires a specific physical support, like a clock or a gyroscope, tobe conveyed.

Teleportation transfers only speakable quantum information