Two-tooth bosonic quantum comb for temporal-correlation sensing
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866912944048046080 |
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| author | Zhu, Shaojiang You, Xinyuan Romanenko, Alexander Grassellino, Anna |
| author_facet | Zhu, Shaojiang You, Xinyuan Romanenko, Alexander Grassellino, Anna |
| contents | We introduce a two-tooth bosonic quantum comb that captures the sequential interactions between a thermal absorber and a long-lived coherent probe. The comb provides a causal, multi-time description of coherence transport, tracking how the probe records both instantaneous fluctuations and their temporal correlations. Using a process-tensor formulation, we derive closed form expressions showing that interference between the two interaction windows generates a non-monotonic memory response that reflects a fundamental competition between the absorbers thermal population and its dynamical correlations. By sweeping the temporal separation between the interaction windows, the probe directly samples the absorbers population correlator, enabling bosonic noise spectroscopy that discriminates Markovian temperature noise from slow or spectrally structured fluctuations. The approach is readily compatible with circuit-QED platforms and offers a general method for probing fluctuating bosonic environments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_10916 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Two-tooth bosonic quantum comb for temporal-correlation sensing Zhu, Shaojiang You, Xinyuan Romanenko, Alexander Grassellino, Anna Quantum Physics We introduce a two-tooth bosonic quantum comb that captures the sequential interactions between a thermal absorber and a long-lived coherent probe. The comb provides a causal, multi-time description of coherence transport, tracking how the probe records both instantaneous fluctuations and their temporal correlations. Using a process-tensor formulation, we derive closed form expressions showing that interference between the two interaction windows generates a non-monotonic memory response that reflects a fundamental competition between the absorbers thermal population and its dynamical correlations. By sweeping the temporal separation between the interaction windows, the probe directly samples the absorbers population correlator, enabling bosonic noise spectroscopy that discriminates Markovian temperature noise from slow or spectrally structured fluctuations. The approach is readily compatible with circuit-QED platforms and offers a general method for probing fluctuating bosonic environments. |
| title | Two-tooth bosonic quantum comb for temporal-correlation sensing |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2601.10916 |