(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! :)

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Quantum hw problem

**Physics Forums | Science Articles, Homework Help, Discussion**