Quantum Digital Signatures without Quantum Memory
Quantum Digital Signatures without Quantum Memory
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DOI：
10.1103/physrevlett.112.040502
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发表时间：
2014-01-31
影响因子：
8.6
通讯作者：
Andersson, Erika
中科院分区：
文献类型：
--
作者：
Dunjko, Vedran;Wallden, Petros;Andersson, Erika
量子数字签名（QDS）允许从一个发送者向多个接收者发送消息，并保证消息不会被伪造或篡改。此外，消息不能被拒绝-如果一个接收者接受了消息，她保证其他人也会接受相同的消息。虽然具有这些类型的安全保证的消息传递在现代数字世界中是常规执行的，但当前技术仅在计算假设下提供安全性。另一方面，QDS提供了由量子力学保证的安全性。到目前为止，所有提出的QDS变体都需要长期、高质量的量子存储器，这使得它们在可预见的未来不可行。在这里，我们提出了一个QDS方案，其中不需要量子存储器，也只需要线性光学。这使得QDS在当前技术下是可行的。
Quantum digital signatures (QDSs) allow the sending of messages from one sender to multiple recipients, with the guarantee that messages cannot be forged or tampered with. Additionally, messages cannot be repudiated-if one recipient accepts a message, she is guaranteed that others will accept the same message as well. While messaging with these types of security guarantees are routinely performed in the modern digital world, current technologies only offer security under computational assumptions. QDSs, on the other hand, offer security guaranteed by quantum mechanics. All thus far proposed variants of QDSs require long-term, high quality quantum memory, making them unfeasible in the foreseeable future. Here, we present a QDS scheme where no quantum memory is required, which also needs just linear optics. This makes QDSs feasible with current technology.