Abstract
Quantum key distribution (QKD) is a promising technique to share unconditionally secure keys between remote parties. As an essential part of a practical QKD system, reconciliation is responsible for correcting the errors due to the quantum channel noise by exchanging information through a public classical channel. In the present work, we propose a novel syndrome-based low-density parity-check (LDPC) reconciliation protocol to reduce the information leakage of reconciliation by fully utilizing the syndrome information that was previously wasted. Both theoretical analysis and simulation results show that our protocol can evidently reduce the information leakage as well as the number of communication rounds.
Highlights
Quantum key distribution (QKD) is a promising technique to share secure keys via insecure quantum and classical channels between two remote parties, usually called Alice and Bob [1]
We focus on the information reconciliation (IR) step, which is obviously a vital step of QKD [17], for the errors introduced in the quantum phase must be eliminated to obtain a correct and secure key sequence available in cryptography
We note that the principal difference between our protocol and the previous protocols is that our protocol adds an additional step “Step 1” and needs to control the decoding processes between layers in “Step 2”
Summary
Quantum key distribution (QKD) is a promising technique to share secure keys via insecure quantum and classical channels between two remote parties, usually called Alice and Bob [1]. To produce high efficiencies in a range of possible QBERs, many highly efficient large frame-length LDPC codes that were difficult to design, as well as a highly accurate estimation of QBER that might be unpredictable in a practical QKD system, were needed To overcome such shortcomings, the rate-adaptive protocol was proposed [20]. Alice published a small fixed number of punctured bits, which would help Bob to resume the decoding In this way, a blind protocol could work without a priori QBER and enhance the efficiency under the circumstance of the fluctuated QBER in practice. To further improve the efficiency while reducing the interactivity, the symmetric-blind reconciliation protocol was proposed [22] via introducing symmetry in operations of two parties and consideration on unsuccessful decoding results These LDPC-based protocols have their own application scope.
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