Qubit error rate of QKD BB84 protocol

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SUMMARY

The Quantum Bit Error Rate (QBER) in the BB84 protocol is a critical metric for assessing the security of quantum key distribution. It quantifies the percentage of erroneous bits during key distribution, calculated by dividing the number of erroneous bits by the total length of the raw key. In scenarios where an eavesdropper (Eve) intercepts qubits, the QBER reaches 25%, derived from the formula ½(0) + ½(½) = ¼. This calculation reflects the probability of Eve using the correct or incorrect basis when measuring qubits.

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  • Understanding of Quantum Key Distribution (QKD)
  • Familiarity with the BB84 protocol
  • Knowledge of Quantum Bit Error Rate (QBER) calculations
  • Basic principles of quantum mechanics and eavesdropping scenarios
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  • Research methods for measuring QBER in experimental setups
  • Explore advanced security implications of the BB84 protocol
  • Study the impact of different eavesdropping strategies on QBER
  • Learn about improvements in QKD protocols beyond BB84
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Quantum cryptographers, researchers in quantum computing, and security analysts focused on enhancing the robustness of quantum key distribution systems.

Pattarasak
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Hello everyone, I don't know how to measure the QBER of BB84 protocol in a realistic experiment.In the most paper show the data which is only the number but do not show the unit of data, what is the unit of these data?
 
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The Quantum Bit Error Rate (QBER) is the measurement of the percentage or probability of bit error across the quantum channel during key distribution. After obtaining the raw key, QBER can be calculated by taking the length of erroneous bits divided by length of raw key. In BB84 protocol, if an Eve intercept every qubits, QBER is 25%. How to calculate: ½(0) + ½(½) = ¼. (simply means half of the time, Eve would have use the correct basis, other half, she would use wrongly and half of that time where she used it wrongly, Eve would be discovered and that is reflected in QBER.
 
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