The uncloneable bit exists
Fuente:
arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| Soggetti: | |
| Accesso online: | |
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| _version_ | 1866912957687922688 |
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| author | Bhattacharyya, Archishna Broadbent, Anne Culf, Eric |
| author_facet | Bhattacharyya, Archishna Broadbent, Anne Culf, Eric |
| contents | We establish quantum uncloneable encryption with unconditional security, preventing two non-communicating adversaries from simultaneously decrypting a single ciphertext $-$ even when both are given the key. Our construction achieves security that approaches the ideal limit at a rate that is exponentially small in the security parameter, without employing any assumptions. Our proof invokes quantum information principles in the fully quantum realm, in a novel setting of cryptography. A decoupling step certifies the statistical independence needed for randomness extraction, and monogamy of entanglement, formalised via strong subadditivity, rules out the sender being highly correlated with two non-communicating adversaries at once. Consequently, no coordinated strategy beats random guessing of the encrypted bit, establishing unconditional uncloneability. This reveals the existence of an uncloneable bit in Nature and delineates a fundamental, physically enforced cryptographic primitive unavailable in classical settings. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_08916 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | The uncloneable bit exists Bhattacharyya, Archishna Broadbent, Anne Culf, Eric Quantum Physics We establish quantum uncloneable encryption with unconditional security, preventing two non-communicating adversaries from simultaneously decrypting a single ciphertext $-$ even when both are given the key. Our construction achieves security that approaches the ideal limit at a rate that is exponentially small in the security parameter, without employing any assumptions. Our proof invokes quantum information principles in the fully quantum realm, in a novel setting of cryptography. A decoupling step certifies the statistical independence needed for randomness extraction, and monogamy of entanglement, formalised via strong subadditivity, rules out the sender being highly correlated with two non-communicating adversaries at once. Consequently, no coordinated strategy beats random guessing of the encrypted bit, establishing unconditional uncloneability. This reveals the existence of an uncloneable bit in Nature and delineates a fundamental, physically enforced cryptographic primitive unavailable in classical settings. |
| title | The uncloneable bit exists |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2603.08916 |