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BB84 Quantum Key Distribution: Difference between revisions
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[[Category:Multi Party Protocols]] [[Category:Quantum Enhanced Classical Functionality]][[Category:Specific Task]][[Category:Prepare and Measure Network Stage]] | [[Category:Multi Party Protocols]] [[Category:Quantum Enhanced Classical Functionality]][[Category:Specific Task]][[Category:Prepare and Measure Network Stage]] | ||
==Outline== | |||
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The protocol shares a classical between two parties, sender (Alice) and receiver (Bob). | The protocol shares a classical between two parties, sender (Alice) and receiver (Bob). | ||
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*'''Privacy amplification:''' Both use an [[extractor]] on the previously established string to generate a smaller but completely secret string of bits, which is the final key. | *'''Privacy amplification:''' Both use an [[extractor]] on the previously established string to generate a smaller but completely secret string of bits, which is the final key. | ||
==Hardware Requirements == | |||
*'''Network Stage:''' [[:Category:Prepare and Measure Network Stage|Prepare and Measure]] | |||
*'''Relevant Network Parameters:''' <math>\epsilon_T, \epsilon_M</math> (see [[:Category:Prepare and Measure Network Stage|Prepare and Measure]]) | |||
*'''Benchmark values:''' | |||
**Minimum number of rounds ranging from <math>\mathcal{O}(10^2)</math> to <math>\mathcal{O}(10^5)</math> depending on the network parameters, for commonly used secure parameters. | |||
**<math>QBER \leq 0.11</math>, taking a depolarizing model as benchmark. Parameters satisfying <math> \epsilon_T+\epsilon_M\leq 0.11</math> are sufficient. | |||
*requires Authenticated classical channel, Random number generator. | |||
==Notations Used== | |||
**<math>n</math> number of total rounds of the protocol. | **<math>n</math> number of total rounds of the protocol. | ||
**<math>\ell</math> size of the secret key. | **<math>\ell</math> size of the secret key. | ||
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**<math>\epsilon_{\rm PA}</math> is the error probability of the privacy amplification protocol. | **<math>\epsilon_{\rm PA}</math> is the error probability of the privacy amplification protocol. | ||
**<math>\epsilon_{\rm PE}</math> is the error probability of the parameter estimation. | **<math>\epsilon_{\rm PE}</math> is the error probability of the parameter estimation. | ||
==Properties== | |||
'''The protocol-''' | '''The protocol-''' | ||
**is Information-theoretically secure | **is Information-theoretically secure | ||
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(See [[Quantum Key Distribution]] for the precise security definition) | (See [[Quantum Key Distribution]] for the precise security definition) | ||
==Pseudo Code== | |||
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#Sender and Receiver run $PA(A_1^{n'},\tilde{B}_1^{n'})$ and obtain secret keys $K_A, K_B$\; | #Sender and Receiver run $PA(A_1^{n'},\tilde{B}_1^{n'})$ and obtain secret keys $K_A, K_B$\; | ||
== | ==Discussion== | ||