Real-Time Monitoring of Multimode Squeezing
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908579911434240 |
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| author | Kalash, Mahmoud Sudharsanam, Aditya Passos, M. H. M. Parigi, Valentina Chekhova, Maria |
| author_facet | Kalash, Mahmoud Sudharsanam, Aditya Passos, M. H. M. Parigi, Valentina Chekhova, Maria |
| contents | Multimode squeezed light is a key resource for high-dimensional quantum technologies, enhancing metrological sensitivity, boosting communication security, and enabling parallel processing in computation. Its practical potential, however, remains constrained by the inherent single-mode operation of homodyne detection, necessitating post-processing for multimode characterization. Here, we overcome this long-standing challenge by employing multimode optical parametric amplification (MOPA), enabling loss-tolerant direct detection of squeezing in each mode, which in turn permits mode sorting after amplification. As a result, we demonstrate, for the first time to the best of our knowledge, the real-time monitoring of multimode squeezing. With a spatial light modulator sorting the modes, we simultaneously measure squeezing in nine spatial modes co-propagating within one beam. Although mode sorting and filtering reduce the detection efficiency to less than $0.3\%$, we observe high-purity squeezing of up to $-7.9 \pm 0.6$ dB -- to the best of our knowledge, the highest squeezing recorded for pulsed light. Furthermore, we demonstrate real-time, loss-tolerant characterization of continuous-variable entanglement and extend it to the detection of cluster states. Similar methods can be applied in the frequency domain, facilitating a crucial capability for scalable quantum technologies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_07486 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Real-Time Monitoring of Multimode Squeezing Kalash, Mahmoud Sudharsanam, Aditya Passos, M. H. M. Parigi, Valentina Chekhova, Maria Quantum Physics Multimode squeezed light is a key resource for high-dimensional quantum technologies, enhancing metrological sensitivity, boosting communication security, and enabling parallel processing in computation. Its practical potential, however, remains constrained by the inherent single-mode operation of homodyne detection, necessitating post-processing for multimode characterization. Here, we overcome this long-standing challenge by employing multimode optical parametric amplification (MOPA), enabling loss-tolerant direct detection of squeezing in each mode, which in turn permits mode sorting after amplification. As a result, we demonstrate, for the first time to the best of our knowledge, the real-time monitoring of multimode squeezing. With a spatial light modulator sorting the modes, we simultaneously measure squeezing in nine spatial modes co-propagating within one beam. Although mode sorting and filtering reduce the detection efficiency to less than $0.3\%$, we observe high-purity squeezing of up to $-7.9 \pm 0.6$ dB -- to the best of our knowledge, the highest squeezing recorded for pulsed light. Furthermore, we demonstrate real-time, loss-tolerant characterization of continuous-variable entanglement and extend it to the detection of cluster states. Similar methods can be applied in the frequency domain, facilitating a crucial capability for scalable quantum technologies. |
| title | Real-Time Monitoring of Multimode Squeezing |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2503.07486 |