Quantum Key Distribution - interception confusion

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SUMMARY

The discussion centers on the intricacies of Quantum Key Distribution (QKD) and the potential for interception by an eavesdropper, Eve. It highlights a scenario where Alice measures an entangled photon, resulting in a predetermined state for Bob's photon. If Eve intercepts and measures Bob's photon, she risks detection unless she matches the polarization used by Alice. This emphasizes the critical role of polarization in QKD and the inherent security mechanisms that alert Alice and Bob to potential interception attempts.

PREREQUISITES
  • Understanding of Quantum Key Distribution (QKD)
  • Knowledge of entangled photons and their properties
  • Familiarity with polarization states in quantum mechanics
  • Basic concepts of eavesdropping in quantum communication
NEXT STEPS
  • Research the principles of Quantum Key Distribution protocols
  • Study the role of entangled photons in quantum communication
  • Learn about polarization measurement techniques in quantum systems
  • Explore detection methods for eavesdropping in QKD
USEFUL FOR

Quantum physicists, cybersecurity professionals, and researchers interested in secure communication methods will benefit from this discussion.

JaneHall89
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I'm battled by my thought of interception.

The entangled photon between Alice and Bob, suppose the one at Alice's side is already measured to be 1, so the second is heading over to Bob to be 0. Eve gets to it first and measures it to be 0.

Knowing its 0, eve prepares a photon of state 0 and sends it to Bob.

Both Alice and Bob are oblivious to the interception. What am I missing ?
 
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