Problem 13
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Problem 13.2 Show that if Alice makes a measurement in the x-basis that the information originally then sent to Bob is lost in the z-basis. In other words, show that while Alice would have known with certainty the answer Bob would get, if she measures in the x-basis and forgets to tell Bob to rotate, she no longer knows what answer Bob will get and that Bob can measure either spin up or spin down. See discussion in J.J. Sakurai and Jim Napolitano, Modern Quantum Mechanics 2nd edition Boston, Addison Wesley (1994) or Paul R. Berman, Introductory to Quantum Mechanics, Springer (2018).
