What is a Gaussian channel, and when is it physically implementable using a multiport interferometer?
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arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866915275662688256 |
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| author | Devendra, Repana John, Tiju Cherian Sumesh, K. |
| author_facet | Devendra, Repana John, Tiju Cherian Sumesh, K. |
| contents | Quantum Gaussian channels are fundamental models for communication and information processing in continuous-variable quantum systems. This work addresses both foundational aspects and physical implementation pathways for these channels. Firstly, we provide a rigorous, unified framework by formally proving the equivalence of three principal definitions of quantum Gaussian channels prevalent in the literature, consolidating theoretical understanding. Secondly, we investigate the physical realization of these channels using multiport interferometers, a key platform in quantum optics. The central research contribution is a precise characterization of the channel parameters that correspond to Gaussian channels physically implementable via linear optical multiport interferometers. This characterization bridges the abstract mathematical description with concrete physical architectures. Along the way, we also resolve some questions posed by Parthasarathy (Indian J. Pure Appl. Math. 46, (2015)). |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_02834 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | What is a Gaussian channel, and when is it physically implementable using a multiport interferometer? Devendra, Repana John, Tiju Cherian Sumesh, K. Quantum Physics Information Theory Mathematical Physics Functional Analysis 81P47, 81V73, 81V80, 46L07 Quantum Gaussian channels are fundamental models for communication and information processing in continuous-variable quantum systems. This work addresses both foundational aspects and physical implementation pathways for these channels. Firstly, we provide a rigorous, unified framework by formally proving the equivalence of three principal definitions of quantum Gaussian channels prevalent in the literature, consolidating theoretical understanding. Secondly, we investigate the physical realization of these channels using multiport interferometers, a key platform in quantum optics. The central research contribution is a precise characterization of the channel parameters that correspond to Gaussian channels physically implementable via linear optical multiport interferometers. This characterization bridges the abstract mathematical description with concrete physical architectures. Along the way, we also resolve some questions posed by Parthasarathy (Indian J. Pure Appl. Math. 46, (2015)). |
| title | What is a Gaussian channel, and when is it physically implementable using a multiport interferometer? |
| topic | Quantum Physics Information Theory Mathematical Physics Functional Analysis 81P47, 81V73, 81V80, 46L07 |
| url | https://arxiv.org/abs/2505.02834 |