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The Fuchs-Peres-Brandt (FPB) probe realizes the most powerful individual attack on BB84 quantum key distribution. A physical simulation of the FPB-probe attack using single-photon two-qubit quantum logic is described.
Cascade of two photonic AND gates integrated on one chip was realized using symmetric GaAs microrings. Successive switching of an input signal by the two gates was achieved, demonstrating multi-stage operation of microring logic circuits.
We have demonstrated reconfigurable all optical logic gates based on FWM in single SOA using polarization encoded signals. Six different logic functions can be realized by simply adjusting two polarization controllers in the setup.
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