Quantum Channel Masking
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arXiv
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| Main Authors: | , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866917462687088640 |
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| author | Honeycutt, Anna Murray, Hailey Chitambar, Eric |
| author_facet | Honeycutt, Anna Murray, Hailey Chitambar, Eric |
| contents | Quantum masking is a special type of secret sharing in which some information gets reversibly distributed into a multipartite system, leaving the original information inaccessible to each subsystem. This paper proposes a dynamical extension of quantum masking to the level of quantum channels. In channel masking, the identity of a channel becomes locally hidden but still globally accessible after its output is sent through a bipartite broadcasting channel. We first characterize all families of d-dimensional unitaries that can be isometrically masked, a condition that holds even in the presence of depolarizing noise. For the case of qubits, we identify which families of Pauli channels can be masked, and we prove that a qubit channel can be masked against the identity if and only if it is unital and has a pure-state fixed point. Masking against the identity describes a scenario in which channel noise becomes completely delocalized through a broadcast map and undetectable through subsystem dynamics alone. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_09456 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Quantum Channel Masking Honeycutt, Anna Murray, Hailey Chitambar, Eric Quantum Physics Quantum masking is a special type of secret sharing in which some information gets reversibly distributed into a multipartite system, leaving the original information inaccessible to each subsystem. This paper proposes a dynamical extension of quantum masking to the level of quantum channels. In channel masking, the identity of a channel becomes locally hidden but still globally accessible after its output is sent through a bipartite broadcasting channel. We first characterize all families of d-dimensional unitaries that can be isometrically masked, a condition that holds even in the presence of depolarizing noise. For the case of qubits, we identify which families of Pauli channels can be masked, and we prove that a qubit channel can be masked against the identity if and only if it is unital and has a pure-state fixed point. Masking against the identity describes a scenario in which channel noise becomes completely delocalized through a broadcast map and undetectable through subsystem dynamics alone. |
| title | Quantum Channel Masking |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2510.09456 |