Abstract
The security of the quantum secret key plays a critical role in quantum
communications. Thus far, one problem that still exists in existing protocols is the
leakage of the length of the secret key. In this letter, based on variable quantum
encoding algorithms, we propose a secure quantum key distribution scheme, which can
overcome the security problem involving the leakage of the secret key. Security
analysis shows that the proposed scheme is both secure and effective.
© 2011 Chinese Optics Letters
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