Encrypted clones can leak: Classification of informative subsets in Quantum Encrypted Cloning
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866910121247899648 |
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| author | Gianini, Gabriele Hasan, Omar Mio, Corrrado Cimato, Stelvio Damiani, Ernesto |
| author_facet | Gianini, Gabriele Hasan, Omar Mio, Corrrado Cimato, Stelvio Damiani, Ernesto |
| contents | Encrypted cloning enables the redundant storage of an unknown qubit while remaining compatible with the no-cloning theorem, since only one clone can later be recovered through key-consuming decryption. Because encryption in this protocol is introduced to enable cloning-compatible redundancy rather than to guarantee confidentiality by design, its secrecy properties must be assessed explicitly. Here we classify the subsets of the encrypted-clone storage register into authorized, completely non-informative, and partially informative sets. We show that intermediate non-authorized subsets may retain only a restricted residual dependence on the input state, and we characterize exactly when this dependence occurs. The resulting leakage pattern is parity-dependent, revealing a structural confidentiality limitation of encrypted cloning. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_10155 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Encrypted clones can leak: Classification of informative subsets in Quantum Encrypted Cloning Gianini, Gabriele Hasan, Omar Mio, Corrrado Cimato, Stelvio Damiani, Ernesto Quantum Physics Cryptography and Security Encrypted cloning enables the redundant storage of an unknown qubit while remaining compatible with the no-cloning theorem, since only one clone can later be recovered through key-consuming decryption. Because encryption in this protocol is introduced to enable cloning-compatible redundancy rather than to guarantee confidentiality by design, its secrecy properties must be assessed explicitly. Here we classify the subsets of the encrypted-clone storage register into authorized, completely non-informative, and partially informative sets. We show that intermediate non-authorized subsets may retain only a restricted residual dependence on the input state, and we characterize exactly when this dependence occurs. The resulting leakage pattern is parity-dependent, revealing a structural confidentiality limitation of encrypted cloning. |
| title | Encrypted clones can leak: Classification of informative subsets in Quantum Encrypted Cloning |
| topic | Quantum Physics Cryptography and Security |
| url | https://arxiv.org/abs/2604.10155 |