For any chosen set of quantum states and measurement devices prepared accordingly to discriminate among them, we characterize the certainty of quantum measurement to give correct answers about which state is given, using the compatibility of two correlations, one existing in quantum states, entanglement, and the other non-signaling correlations in measurement outcomes. Assuming that quantum states are prepared using the steering effect by a party at a distance, a bound to the maximal probability that can be achieved in the state discrimination, i.e the guessing probability, is presented such that the no-signaling principle is not violated between two parties. We then show that the bound obtained in this way is actually tight to the guessing probability within quantum theory.


Wednesday, April 4, 2012, 17:00. Seminar Room