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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2604.27042 |
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| _version_ | 1866917458496978944 |
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| author | Parentin, Marco Bergh, Bjarne Datta, Nilanjana Wilde, Mark M. |
| author_facet | Parentin, Marco Bergh, Bjarne Datta, Nilanjana Wilde, Mark M. |
| contents | Superactivation of quantum capacity is the phenomenon whereby two quantum channels, each with zero quantum capacity, can exhibit a strictly positive capacity when used in tandem. In this work, we explore superactivation in the previously unexplored non-asymptotic regime of finitely many channel uses. We give a definition of finite-blocklength superactivation and propose numerical methods that can certify it. Then, focusing on the 50% erasure and positive-partial-transpose channels considered in the original work on superactivation, we show that as few as 17 uses of the joint channel already enable qubit transmission with a fidelity unattainable by any number of uses of either channel alone, demonstrating a strong finite-blocklength form of superactivation and opening the door to experimental demonstration. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_27042 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Onset of superactivation of quantum capacity Parentin, Marco Bergh, Bjarne Datta, Nilanjana Wilde, Mark M. Quantum Physics Superactivation of quantum capacity is the phenomenon whereby two quantum channels, each with zero quantum capacity, can exhibit a strictly positive capacity when used in tandem. In this work, we explore superactivation in the previously unexplored non-asymptotic regime of finitely many channel uses. We give a definition of finite-blocklength superactivation and propose numerical methods that can certify it. Then, focusing on the 50% erasure and positive-partial-transpose channels considered in the original work on superactivation, we show that as few as 17 uses of the joint channel already enable qubit transmission with a fidelity unattainable by any number of uses of either channel alone, demonstrating a strong finite-blocklength form of superactivation and opening the door to experimental demonstration. |
| title | Onset of superactivation of quantum capacity |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2604.27042 |