How do you approach the concept of quantum coherence in photonic systems?

Sample interview questions: How do you approach the concept of quantum coherence in photonic systems?

Sample answer:

As a theoretical physicist, I approach the concept of quantum coherence in photonic systems by utilizing a combination of theoretical frameworks and computational techniques. Here’s a detailed overview:

Theoretical Framework:

1. Quantum Field Theory (QFT): I employ QFT to describe the quantum state of the electromagnetic field and its interaction with matter. It provides a powerful tool to analyze coherence phenomena in photonic systems, such as spontaneous emission, photon-photon correlations, and entanglement.

2. Density Matrix Formalism: The density matrix formalism is used to characterize the coherence of individual photons and the overall system. It allows me to quantify the purity, entanglement, and other coherence measures, providing insights into the dynamics and evolution of the system.

3. Feynman Diagrams: Feynman diagrams are graphical representations of quantum processes. They serve as a visual aid to understand the interactions between photons and other particles, such as electrons and atoms. They help identify the key contributions to quantum coherence and decoherence mechanisms.

Computational Techniques:

1. Numerical Simulations: I utilize numerical simulations to solve complex quantum systems and investigate coherence phenomena. This involves simulating the time evolution of the quantum state, calculating correlat… Read full answer

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