Is it just a passive element that doesn't affect the field of the emitted photon from a two level atom? How does it interfere with the entangled field-atom system and cause it to collapse ??
The Density of States
The density of states in free can be calculated as in Loudon 1.1 by assuming standing waves inside the cavity and summing in the reciprocal space over an octant. An alternative is to assume running waves and hence periodic boundary conditions and summing over the whole shell in wave vector space. Both methods yield the same density of states in free space , namely w^2 /(pi^2 c^2) Why ? Which method is conceptually correct ?
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