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.

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**helper**, Tuesday, February 26, 2013 at 2:04am
I

X

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**horseman**, Thursday, March 14, 2013 at 8:39am
I think the same, that in first case you donīt have to do anythin, and in the second case itīs a bit flip, but it is not correct, why? I think itīs because the sign basis used at the begining? So which could be the correct answer?

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**sss**, Sunday, March 17, 2013 at 5:15pm
0 --I,H

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**Anonymous**, Sunday, September 15, 2013 at 12:09pm
what are the answers for 6th a and 6th b questions pls help me

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