Temporally localized quantum operations on continuous-wave thermal light
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866916928961904640 |
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| author | Wang, Yunkai Zhang, Yujie Lorenz, Virginia O. |
| author_facet | Wang, Yunkai Zhang, Yujie Lorenz, Virginia O. |
| contents | Previous work showed that thermal light with a blackbody spectrum cannot be decomposed into a mixture of independent localized pulses. However, we find that in the weak-source limit and under the assumption of a flat spectrum, the first non-vacuum term in the state expansion does form a mixture of such pulses. This decomposition is essential for quantum-enhanced astronomical interferometry, which typically operates on localized pulses even though stellar light is inherently continuous-wave. We present a quantum derivation of the van Cittert-Zernike theorem that incorporates finite bandwidth, thereby justifying the operations on localized pulses while processing continuous-wave thermal light. For general spectra in the weak-source limit, we establish a criterion under which correlations between pulses can be safely neglected. When this criterion is not met, we provide a corrected strategy that accurately accounts for both the spectral profile and the detector-defined pulse shape. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2412_17223 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Temporally localized quantum operations on continuous-wave thermal light Wang, Yunkai Zhang, Yujie Lorenz, Virginia O. Quantum Physics Optics Previous work showed that thermal light with a blackbody spectrum cannot be decomposed into a mixture of independent localized pulses. However, we find that in the weak-source limit and under the assumption of a flat spectrum, the first non-vacuum term in the state expansion does form a mixture of such pulses. This decomposition is essential for quantum-enhanced astronomical interferometry, which typically operates on localized pulses even though stellar light is inherently continuous-wave. We present a quantum derivation of the van Cittert-Zernike theorem that incorporates finite bandwidth, thereby justifying the operations on localized pulses while processing continuous-wave thermal light. For general spectra in the weak-source limit, we establish a criterion under which correlations between pulses can be safely neglected. When this criterion is not met, we provide a corrected strategy that accurately accounts for both the spectral profile and the detector-defined pulse shape. |
| title | Temporally localized quantum operations on continuous-wave thermal light |
| topic | Quantum Physics Optics |
| url | https://arxiv.org/abs/2412.17223 |