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Quantum Key Distribution is a quantum communication technique in which randomnumbers are encoded on quantum systems, usually photons, and sent from oneparty, Alice, to another, Bob. Using the data sent via the quantum signals,supplemented by classical communication, it is possible for Alice and Bob toshare an unconditionally secure secret key. This is not possible if onlyclassical signals are sent. Whilst this last statement is a long standingresult from quantum information theory it turns out only to be true in anon-relativistic setting. If relativistic quantum field theory is considered weshow it is possible to distribute an unconditionally secure secret key withoutsending a quantum signal, instead harnessing the intrinsic entanglement betweendifferent regions of space time. The protocol is practical in free space givenhorizon technology and might be testable in principle in the near term usingmicrowave technology.

Quantum Key Distribution without sending a Quantum Signal