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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2501.09424 |
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| _version_ | 1866912203260559360 |
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| author | Göttsch, Julian Grebien, Stephan Pein, Felix Lautzas, Malte Abdelkhalek, Daniela Rebón, Lorena Hage, Boris Fiurašek, Jaromír Schnabel, Roman |
| author_facet | Göttsch, Julian Grebien, Stephan Pein, Felix Lautzas, Malte Abdelkhalek, Daniela Rebón, Lorena Hage, Boris Fiurašek, Jaromír Schnabel, Roman |
| contents | Microscopic Schr{ö}dinger cat states are generated from quantum correlated fields using a probabilistic heralding photon subtraction event. Subsequent quantum state tomography provides complete information about the state with typical photon numbers of the order of one. Another approach strives for a larger number of quantum-correlated photons by conditioning the measurement analysis on events with exactly this number of photons. Here, we present a new approach to derive measurement data of quantum correlated states with average quantum-correlated photon numbers significantly larger than one. We produce an ensemble of a heralded, photon-subtracted squeezed vacuum state of light. We split the states at a balanced beam splitter and simultaneously measure a pair of orthogonal field quadratures at the outputs using tomographic `Q-function homodyne detection' (QHD). The final act is probabilistic two-copy data post-processing aiming for data from a new state with larger photon number. Evaluating the final tomographic data as that of a grown microscopic Schr{ö}dinger cat state shows that the probabilistic post-processing increased the photon number of $|α_0|^2 \approx 1.2$ to $|α_2|^2 \approx 6.8$. Our concept for obtaining tomographic measurement data of mesoscopic non-classical states that never existed might be a turning point in measurement-based quantum technology. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_09424 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Tomographic measurement data of states that never existed Göttsch, Julian Grebien, Stephan Pein, Felix Lautzas, Malte Abdelkhalek, Daniela Rebón, Lorena Hage, Boris Fiurašek, Jaromír Schnabel, Roman Quantum Physics Optics Microscopic Schr{ö}dinger cat states are generated from quantum correlated fields using a probabilistic heralding photon subtraction event. Subsequent quantum state tomography provides complete information about the state with typical photon numbers of the order of one. Another approach strives for a larger number of quantum-correlated photons by conditioning the measurement analysis on events with exactly this number of photons. Here, we present a new approach to derive measurement data of quantum correlated states with average quantum-correlated photon numbers significantly larger than one. We produce an ensemble of a heralded, photon-subtracted squeezed vacuum state of light. We split the states at a balanced beam splitter and simultaneously measure a pair of orthogonal field quadratures at the outputs using tomographic `Q-function homodyne detection' (QHD). The final act is probabilistic two-copy data post-processing aiming for data from a new state with larger photon number. Evaluating the final tomographic data as that of a grown microscopic Schr{ö}dinger cat state shows that the probabilistic post-processing increased the photon number of $|α_0|^2 \approx 1.2$ to $|α_2|^2 \approx 6.8$. Our concept for obtaining tomographic measurement data of mesoscopic non-classical states that never existed might be a turning point in measurement-based quantum technology. |
| title | Tomographic measurement data of states that never existed |
| topic | Quantum Physics Optics |
| url | https://arxiv.org/abs/2501.09424 |