developing cryptographic intuitions for quantum era

we learned from the description of the us 1945 5205 cryptographic process how, despite all its engineering complexity, the machine counted how many time certain (high scoring, distinguishing) characters appeared in a tunny stream. for example, compute chi (5bits) xor ‘e’ (5 bits). now count the hits in cipher. e will have less uncertainty than it would have, were its to be found in a random cipher stream.


we have seen that, in quantum mechanics, a inner product is, on the one hand, a measure of the distinguishability of two states, and  ‘the value e’  on the other. Should one score ‘e’, its a measure of the transition probability. perhaps e is just a representative of its weight class, and perhaps one goes about counting any distinction equivalent to a weight difference.


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