Assisted quantum teleportation
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arXiv
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| Auteurs principaux: | , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866911696124116992 |
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| author | Kumar, Mithilesh Iyer, Kaavya |
| author_facet | Kumar, Mithilesh Iyer, Kaavya |
| contents | Teleportation through a non-maximally entangled pair, e.g., $\ket{ψ(θ)}_{AB}=\cosθ\ket{00}+\sinθ\ket{11}$, induces a noisy channel and cannot achieve deterministic unit-fidelity transmission unless $θ=π/4$. We introduce a framework of \emph{assisted quantum teleportation} in which a third party (the ``Bank'') supplies auxiliary multipartite entanglement to restore a perfect Bell pair on the original $AB$ registers. We analyze two operational roles for the Bank: a Bank-measures model (measurement and broadcast) and a transfer model (the Bank transfers its subsystem and then leaves). For GHZ-class and W-class assistance we derive explicit feasibility regions for deterministic restoration and show an operational inequivalence for W resources. We further characterize finite-shot optimal success probabilities for probabilistic restoration and formulate Bank-measures feasibility for general pure Bank resources as a minimax optimization. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_18896 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Assisted quantum teleportation Kumar, Mithilesh Iyer, Kaavya Quantum Physics Teleportation through a non-maximally entangled pair, e.g., $\ket{ψ(θ)}_{AB}=\cosθ\ket{00}+\sinθ\ket{11}$, induces a noisy channel and cannot achieve deterministic unit-fidelity transmission unless $θ=π/4$. We introduce a framework of \emph{assisted quantum teleportation} in which a third party (the ``Bank'') supplies auxiliary multipartite entanglement to restore a perfect Bell pair on the original $AB$ registers. We analyze two operational roles for the Bank: a Bank-measures model (measurement and broadcast) and a transfer model (the Bank transfers its subsystem and then leaves). For GHZ-class and W-class assistance we derive explicit feasibility regions for deterministic restoration and show an operational inequivalence for W resources. We further characterize finite-shot optimal success probabilities for probabilistic restoration and formulate Bank-measures feasibility for general pure Bank resources as a minimax optimization. |
| title | Assisted quantum teleportation |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2605.18896 |