1. OBE <br>
Definition 0.25 p <br>
Equation of motion 0.5p. If not defined quantities with tilde, -0.1p. <br> 
RWA 0.25 p <br><br>
2. Coherent state <br>
< n > = |a|^2 0.4p <br>
Delta n = |a| 0.4p <br>
If answered with variance instead of std dev, -0.1p <br>
Part b, 0.2p <br>
Lasers give approx coherent states; broadened by spont em and phase diffuses in time<br><br>
3. Quantum measurement <br>
Definition as in the lecture notes to Lecture 18. <br>
Particular case instead of general state (e.g. two-level): -0.25p <br>
Unnormalized final state -0.25p <br>
Fail to mention probability |Cj|^2: -0.25p <br>
<br>
4. 3-level laser<br>
N1 << N2 <br>
B_01 < W > small <br>
A_10 large <br>
0.2p each for the above. 0.4p for correct equation of motion <br><br>
5. Bunched, Poissonian <br>
0.4 for bunched, 0.4 for Poissonian, 0.2 for sketch <br>