If you have a two-qubit system |x>[(|0>-|1>)/√2], whereby x∈{0,1}, and you want to just know x, do you(adsbygoogle = window.adsbygoogle || []).push({});

(a) assume that this means that |x> belongs to one particle, (|0>-|1>)/√2 to another particle, so you just measure the first particle? or

(b) if you can't tell the particles apart, pass this through a gate (Identity ⊗ Hadamard) to get either 2 of the same (in which case x=1) or 2 different (in which case x =0),

(c) other?

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# To measure only one qubit of two

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