(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

I can't figure this one out: A two-state quantum system is psi = c1|1> + c2|2> and the states are orthonormal and c1 and c2 are complex and normalized condition is c1c1* + c2c2* = 1

where * denotes complex conjugate

The probability of measuring the quantum system to be in state |2> is given by the expectation value of a certain operator P_2

What is the operator P_2

2. Relevant equations

standard expectation value and operator equations

3. The attempt at a solution

I think i figured that the probability to measure the system in state |2> is c2c2*

then c2c2* = <P_2> = <psi|P_2|psi> but going through that I can't figure out how to determine P_2 .... i think i am missing something simple and any help would be very much appreciated! :)

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# Homework Help: Quantum hw problem

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