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Unconditional security proof of a deterministic quantum key distribution with a two-way quantum channel

机译:具有双向量子通道的确定性量子密钥分配的无条件安全证明

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In a deterministic quantum key distribution (DQKD) protocol with a two-way quantum channel, Bob sends a qubit to Alice who then encodes a key bit onto the qubit and sends it back to Bob. After measuring the returned qubit, Bob can obtain Alice's key bit immediately, without basis reconciliation. Since an eavesdropper may attack the qubits traveling on either the Bob-Alice channel or the Alice-Bob channel, the security analysis of DQKD protocol with a two-way quantum channel is complicated and its unconditional security has been controversial. This paper presents a security proof of a single-photon four-state DQKD protocol against general attacks.
机译:在具有双向量子通道的确定性量子密钥分发(DQKD)协议中,鲍勃将一个量子位发送给爱丽丝,爱丽丝随后将一个密钥位编码到该量子位上,然后将其发送回鲍勃。测量返回的量子位后,Bob可以立即获得Al​​ice的密钥位,而无需进行基础对帐。由于窃听者可能会攻击在Bob-Alice通道或Alice-Bob通道上传播的量子位,因此使用双向量子通道的DQKD协议的安全性分析十分复杂,其无条件安全性引起了争议。本文提出了针对一般攻击的单光子四态DQKD协议的安全性证明。

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