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We analyze entanglement swapping (ES) of partially entangled pure states witharbitrary Schmidt rank from the perspective of quantum state discrimination. Itis shown that the standard deterministic ES protocol is related with an optimalminimum-error strategy. In this case the amount of entanglement of the statesresulting from swapping is, in general, lower than the maximum achievable forthe quantum channels involved. In this regard, we show that the ES protocol canbe probabilistically improved resorting to optimal maximum-confidence (MC)discrimination strategy. Additionally, we show that the success probability ofachieving entanglement above a prescribed value from standard deterministic EScan be increased by applying sequential MC measurements.

Deterministic and probabilistic entanglement swapping of nonmaximally entangled states assisted by optimal quantum state discrimination