Homework Help: Physics

Posted by unknown on Sunday, February 24, 2013 at 8:50pm.

Alice and Bob share a state a|++⟩+b|−−⟩, where the first qubit is Alice's and the second qubit is Bob's. Alice measures her qubit in the standard basis and sends the measurement outcome to Bob. If Bob wants a|+⟩+b|−⟩, what gate does he apply to his qubit in the following two cases? Choose your answer from I,X,Z,H.

When Alice's outcome was 0:
When Alice's outcome was 1:

Physics - ENOUGH! - Ms. Sue, Sunday, February 24, 2013 at 8:51pm
Please show your work on your previous posts before you post any more.
Physics - helper, Tuesday, February 26, 2013 at 2:04am
I
X
Physics - horseman, Thursday, March 14, 2013 at 8:39am
I think the same, that in first case you don´t have to do anythin, and in the second case it´s a bit flip, but it is not correct, why? I think it´s because the sign basis used at the begining? So which could be the correct answer?
Physics - sss, Sunday, March 17, 2013 at 5:15pm
0 --I,H

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