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BB84 Quantum Key Distribution: Difference between revisions
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## size<math>Q</math> = 0 | ## size<math>Q</math> = 0 | ||
## If{<math>X_i = Y_i = 1</math> | ## If{<math>X_i = Y_i = 1</math> | ||
### Sender and Receiver publicly announce | ### Sender and Receiver publicly announce <math>A_i, B_i</math> | ||
### Sender and Receiver compute <math>Q_i = 1 - \delta_{A_iB_i}</math>, where <math>\delta_{A_iB_i}</math> is the Kronecker delta | ### Sender and Receiver compute <math>Q_i = 1 - \delta_{A_iB_i}</math>, where <math>\delta_{A_iB_i}</math> is the Kronecker delta | ||
## size<math>Q</math> += 1\; | ## size<math>Q</math> += 1\; | ||
*Both Sender and Receiver, each, compute <math>Q_X = \frac{1}{\ | *Both Sender and Receiver, each, compute <math>Q_X = \frac{1}{\text{size}Q} \sum_{i=1}^{n'}Q_i</math></br> | ||
<u>'''Stage 4'''</u> Error correction | <u>'''Stage 4'''</u> Error correction | ||
#<math>C(\cdot,\cdot)</math> is an error correction subroutine determined by the previously estimated value of <math>Q_Z</math> and with error parameters <math>\epsilon'_{\rm EC}</math> and <math>\epsilon_{\rm EC}</math> | #<math>C(\cdot,\cdot)</math> is an error correction subroutine determined by the previously estimated value of <math>Q_Z</math> and with error parameters <math>\epsilon'_{\rm EC}</math> and <math>\epsilon_{\rm EC}</math> | ||