A quantum particle is prepared in an unknown state. It is then measured with the outcome |0). (a) Which of the following could be its initial state before the measurement: |0), → 10) + 1). {10) + $11) or (10) + 1))? (b) If you tried to measure the same particle a second time, can you narrow down what the initial state was? (c) Another particle is prepared in the same unknown state. It is measured in the |1) state. What can you say about the initial state now?
A quantum particle is prepared in an unknown state. It is then measured with the outcome |0). (a) Which of the following could be its initial state before the measurement: |0), → 10) + 1). {10) + $11) or (10) + 1))? (b) If you tried to measure the same particle a second time, can you narrow down what the initial state was? (c) Another particle is prepared in the same unknown state. It is measured in the |1) state. What can you say about the initial state now?
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Transcribed Image Text:A quantum particle is prepared in an unknown state. It is then measured with the outcome
|0).
(a) Which of the following could be its initial state before the measurement: |0), 10) +
|1), 10) + |1) or (10) + |1))?
(b) If you tried to measure the same particle a second time, can you narrow down what the
initial state was?
(c) Another particle is prepared in the same unknown state. It is measured in the |1) state.
What can you say about the initial state now?
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