Finite key size analysis of two-way quantum cryptography
Quantum cryptographic protocols solve the longstanding problem of distributing a shared secret string to two distant users by typically making use of one-way quantum channel. However, alternative protocols exploiting two-way quantum channel have been proposed for the same goal and with potential adv...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI
2015
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/47019/1/entropy-17-02723.pdf http://irep.iium.edu.my/47019/ http://www.mdpi.com/1099-4300/17/5/2723 |
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| Summary: | Quantum cryptographic protocols solve the longstanding problem of distributing a shared secret string to two distant users by typically making use of one-way quantum channel. However, alternative protocols exploiting two-way quantum channel have been proposed for the same goal and with potential advantages. Here, we overview a security proof for two-way quantum key distribution protocols, against the most general eavesdropping attack, that utilize an entropic uncertainty relation. Then, by resorting to the “smooth” version of involved entropies, we extend such a proof to the case of finite key size. The results will be compared to those available for one-way protocols showing some advantages.
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