Posted by **Bel** on Friday, March 15, 2013 at 12:58pm.

I.Provide a unitary that maps |+> to |1> and |-> to |0> . Enter 0 in all boxes if no such unitary exists. (In this case, you have to enter 0 explicitly. Blanks are not accepted.)

a b

c d

II.Provide a unitary that maps cos (30) |0> + sin (30) |1> to cos(-15) |0> + sin(-15) |1> and cos(5) |0> + sin(5) |1> to cos(-40) |0> + sin(-40) |1> . Enter 0 in all boxes if no such unitary exists.

a b

c d

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**Gina**, Friday, March 15, 2013 at 2:13pm
Helpppp

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**helper**, Sunday, March 17, 2013 at 2:25pm
1/sqrt(2) -1/sqrt(2)

1/sqrt(2) 1/sqrt(2)

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**Lumen**, Sunday, March 17, 2013 at 2:30pm
Thanks helper, any answer for the second? Thanks

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**Gyano**, Sunday, March 17, 2013 at 3:48pm
I. Is wrong?

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**none of your god-damn business**, Monday, March 18, 2013 at 11:47am
I have got all the rest of the answers correct.. this I couldn't muster.

What is the matrix for Z⊗X (Z applied on the first qubit and X applied on the second qubit)? provide directions, hints, solution ;)

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**Quantum Physics**, Monday, March 18, 2013 at 11:58am
0,1,0,0

1,0,0,0

0,0,0,-1

0,0,-1,0

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**none of your god-damn business**, Monday, March 18, 2013 at 12:01pm
thanks.. got it. 2 entries were wrong in mine. thanks a ton.. 100 % in the mid-term. YAAAAAY !!!

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**Gyano**, Monday, March 18, 2013 at 12:53pm
matrix is wrong??

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**Anonymous**, Monday, March 18, 2013 at 10:30pm
How about No 9a? What is the probability?

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**lana**, Tuesday, March 19, 2013 at 12:41am
problem 8? pleaseee

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