Experimental quantum forgery of quantum optical money
Experimental quantum forgery of quantum optical money
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DOI：
10.1038/s41534-017-0010-x
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发表时间：
2017-03-01
影响因子：
7.6
通讯作者：
Nori, Franco
中科院分区：
文献类型：
--
作者：
Bartkiewicz, Karol;Cernoch, Antonin;Nori, Franco
未知的量子信息不能被完全复制（克隆）。这一陈述是量子技术和量子密码学的基石，包括Wiesner量子货币的开创性方案，这是第一个量子密码学提案。令人惊讶的是，据我们所知，量子货币还没有经过实验测试。在这里，我们通过实验重新审视威斯纳的想法，假设钞票是一个编码在单光子偏振态的图像。我们证明，它是可能的，使用量子态来准备一张钞票，不能理想地复制，而不使所有者意识到只有未经授权的行为。我们提供了量子货币的安全条件，通过调查物理上可实现的限制的保真度的1到2复制的任意序列的量子比特。这些结果可以作为量子数字版权管理的安全措施。
Unknown quantum information cannot be perfectly copied (cloned). This statement is the bedrock of quantum technologies and quantum cryptography, including the seminal scheme of Wiesner's quantum money, which was the first quantum-cryptographic proposal. Surprisingly, to our knowledge, quantum money has not been tested experimentally yet. Here, we experimentally revisit the Wiesner idea, assuming a banknote to be an image encoded in the polarization states of single photons. We demonstrate that it is possible to use quantum states to prepare a banknote that cannot be ideally copied without making the owner aware of only unauthorized actions. We provide the security conditions for quantum money by investigating the physically-achievable limits on the fidelity of 1-to-2 copying of arbitrary sequences of qubits. These results can be applied as a security measure in quantum digital right management.