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The book details how the electromagnetic field can be treated as a collection of independent quantum mechanical harmonic oscillators. Adding a photon to the field. Annihilation Operators ( ): Removing a photon from the field. Number States: Understanding the Fock state representation. 3. Coherence and Interference loudon quantum theory of light pdf
The Quantum Theory of Light, also known as the Photon Theory, was introduced by Albert Einstein in 1905. However, I believe you are referring to a specific resource or textbook written by Loudon. Most institutions provide free digital access to students
: In-depth explanations of balanced homodyne detection used to measure quantum states. also known as the Photon Theory