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In this work we propose the technique for phase-coded weak coherent statesprotocols utilizing two signal states and one decoy state which is found aslinear combination of signal states (Schr\"odinger Cat states); the latterallows to overcome the USD attack. For instance, Schr\"odinger Cat states canbe considered as even coherent states. Moreover we consider decoy statesimplementation based on squeezed vacuum states which might not disables USDcompletely yet produces discrimination probabilities low enough to distributekeys in channel with particular losses. Thus we can detect Eve simply bymonitoring the detection rate of decoy states. It should be noted that thisapproach can be scaled to more complex schemes.

Overcoming unambiguous state discrimination attack with the help of Schr\"odinger Cat decoy states