Fock states and coherent states
Number states and coherent states have different photon statistics.
Physical intuition
Number states and coherent states have different photon statistics. This is the starting point for understanding how nanoscale optical geometry changes the states or dynamics accessible to light and matter.
Deep dive: how the mechanism works
Fock states have definite photon number, while coherent states are displaced vacuum states with Poissonian counts.
How the quantum phenomenon appears
A heralded single photon differs from an attenuated laser pulse. To distinguish a genuinely quantum signal from a classical optical response, connect the device physics to a measurement such as photon correlations, interference visibility, energy-level structure or quantum-state tomography where appropriate.
Assumptions and limitations
Research and simulation exercise
Identify the tunable parameters, predict the observable from the stated model, and sweep one parameter while holding the others fixed. Compare against a simpler reference model, quantify loss and uncertainty, and state which observations would falsify the hypothesis.
Connect the ideas
See the chapter guide and further reading.