What is the meaning of coherent states of mean photon number

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SUMMARY

The discussion centers on the concept of coherent states in quantum mechanics, specifically regarding their mean photon number in the context of a three-stage protocol for multiphoton quantum cryptography. Coherent states are defined as quantum states that exhibit classical-like properties, characterized by a well-defined mean photon number. Additionally, the use of density matrices is emphasized as a method for describing quantum states, providing a complete statistical description of the system.

PREREQUISITES
  • Understanding of coherent states in quantum mechanics
  • Familiarity with multiphoton protocols in quantum cryptography
  • Knowledge of density matrices and their applications in quantum state representation
  • Basic principles of quantum mechanics
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  • Research the properties of coherent states in quantum optics
  • Study the implementation of multiphoton protocols in quantum cryptography
  • Learn about density matrices and their role in quantum mechanics
  • Explore the mathematical formulation of quantum states and their measurements
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Students and researchers in quantum mechanics, quantum cryptography practitioners, and anyone seeking to deepen their understanding of coherent states and density matrices in quantum systems.

Nur Ziadah
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I am studying Quantum Cryptography and I am quite new in Quantum area. I have read an article and I found this confusing statement:
upload_2018-5-17_17-19-48.png

My questions:
1. The three stage protocol implementing multiphoton. What is the meaning of coherent states of mean photon number?
2. How to describe the quantum state by density matrix?

Hopefully that anyone can help me to clarify on this matter, in layman's term. ;)
Thank you.
 

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