Problem 3.27 Sequential measurements. An operator Ä, representing observ- able A, has two normalized eigenstates i and 2, with eigenvalues a1 and a2, respectively. Operator B, representing observable B, has two normalized eigen- states ø1 and ø2, with eigenvalues b1 and b2. The eigenstates are related by (301 + 402)/5, 2= (401 302)/5. = – (a) Observable A is measured, and the value aj is obtained. What is the state of the system (immediately) after this measurement? (b) If B is now measured, what are the possible results, and what are their probabilities? (c) Right after the measurement of B, A is measured again. What is the proba- bility of getting a¡? (Note that the answer would be quite different if I had told you the outcome of the B measurement.)

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Problem 3.27 Sequential measurements. An operator Ä, representing observ-
able A, has two normalized eigenstates 1 and 2, with eigenvalues a1 and a2,
respectively. Operator B, representing observable B, has two normalized eigen-
states ø1 and ø2, with eigenvalues b1 and b2. The eigenstates are related by
= (3ø1 + 402)/5, 42 = (401 –
302)/5.
(a) Observable A is measured, and the value aj is obtained. What is the state of
the system (immediately) after this measurement?
(b) If B is now measured, what are the possible results, and what are their
probabilities?
(c) Right after the measurement of B, A is measured again. What is the proba-
bility of getting a¡? (Note that the answer would be quite different if I had
told you the outcome of the B measurement.)
Transcribed Image Text:Problem 3.27 Sequential measurements. An operator Ä, representing observ- able A, has two normalized eigenstates 1 and 2, with eigenvalues a1 and a2, respectively. Operator B, representing observable B, has two normalized eigen- states ø1 and ø2, with eigenvalues b1 and b2. The eigenstates are related by = (3ø1 + 402)/5, 42 = (401 – 302)/5. (a) Observable A is measured, and the value aj is obtained. What is the state of the system (immediately) after this measurement? (b) If B is now measured, what are the possible results, and what are their probabilities? (c) Right after the measurement of B, A is measured again. What is the proba- bility of getting a¡? (Note that the answer would be quite different if I had told you the outcome of the B measurement.)
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