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Quantum Physics

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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 -

    b- no

  • Quantum Physics -

    a) 0.853

  • Quantum Physics -

    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 -

    (c) What quantum state do you have to input in order to get output 1/2ã(|00⟩+|11⟩)?

  • Quantum Physics -

    Helppp

  • Quantum Physics -

    u are all cheaters on the exam and will be reported.

  • Quantum Physics -

    lolol at Anonymous

  • Quantum Physics -

    :D im glad someone has a sense of humour..

  • Quantum Physics -

    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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