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quantum99
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Homework Statement
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
Homework Equations
standard expectation value and operator equations
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! :)