Posted by qwerty on Monday, March 11, 2013 at 11:15pm.
Suppose we are given a single qubit which is either in the state u> = cos(pi/8) 0> + sin(pi/8) 1> or v> = cos(3pi/8) 0> + sin(3pi/8) 1>. We measure this qubit in the standard basis and guess u if the outcome is 0 and guess v if the outcome is 1.
(a) What is the probability that you guess right?
(b) Is there a measurement which is correct more often?
Yes
No

Quantum Physics  helpman, Wednesday, March 13, 2013 at 9:56am
b no

Quantum Physics  willie wonka, Thursday, March 14, 2013 at 2:03pm
a) 0.853

Quantum Physics  Any, Thursday, March 14, 2013 at 4:55pm
a) What quantum state do you have to input in order to get output 00⟩ ?
b) What quantum state do you have to input in order to get output 11⟩ ?

Quantum Physics  Tuma, Thursday, March 14, 2013 at 5:10pm
(c) What quantum state do you have to input in order to get output 1/2ã(00⟩+11⟩)?

Quantum Physics  Gina, Friday, March 15, 2013 at 2:19pm
Helppp

Quantum Physics  Anonymous, Sunday, March 17, 2013 at 2:44pm
u are all cheaters on the exam and will be reported.

Quantum Physics  helpful, Monday, March 18, 2013 at 2:57am
lolol at Anonymous

Quantum Physics  Anonymous, Monday, March 18, 2013 at 5:07am
:D im glad someone has a sense of humour..

Quantum Physics  Don, Monday, March 18, 2013 at 5:30pm
If the first qubit is in the state 2/sqrt(5)0>  1/sqrt(5)1> and the second qubit is in the state 1/sqrt(2)0>  i/sqrt(2)1>, what is the state of the composite system?
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