A photonic quantum SWITCH detects eavesdropping in a BB84-like protocol via control-qubit measurements, with average detection probability 0.15 +/- 0.02 per qubit and no key-bit disclosure, as a proof of principle.
Hardy, Quantum gravity computers: On the theory of computation with indefinite causal structure (Springer Netherlands, Dordrecht, 2009) pp
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Experimental Quantum Key Distribution in an Indefinite Causal Order
A photonic quantum SWITCH detects eavesdropping in a BB84-like protocol via control-qubit measurements, with average detection probability 0.15 +/- 0.02 per qubit and no key-bit disclosure, as a proof of principle.