Quantum State Tomography in a Third-Order Integrated Optical Parametric Oscillator
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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_ | 1866929710300135424 |
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| author | Kögler, Roger Alfredo Rickli, Gabriel Couto Domeneguetti, Renato Ribeiro Ji, Xingchen Gaeta, Alexander L. Lipson, Michal Martinelli, Marcelo Nussenzveig, Paulo |
| author_facet | Kögler, Roger Alfredo Rickli, Gabriel Couto Domeneguetti, Renato Ribeiro Ji, Xingchen Gaeta, Alexander L. Lipson, Michal Martinelli, Marcelo Nussenzveig, Paulo |
| contents | We measured the covariance matrix of the fields generated in an integrated third-order optical parametric oscillator operating above threshold. We observed up to $(2.3 \pm 0.3)$ dB of squeezing in amplitude difference, inferred $(4.9 \pm 0.7)$ dB of on-chip squeezing, while an excess of noise for the sum of conjugated quadratures hinders the entanglement. The degradation of amplitude correlations and state purity for the increasing of the pump power is consistent with the observed growth of the phase noise of the fields, showing the necessity of strategies for phase noise control aiming at entanglement generation in these systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_07589 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Quantum State Tomography in a Third-Order Integrated Optical Parametric Oscillator Kögler, Roger Alfredo Rickli, Gabriel Couto Domeneguetti, Renato Ribeiro Ji, Xingchen Gaeta, Alexander L. Lipson, Michal Martinelli, Marcelo Nussenzveig, Paulo Quantum Physics Optics We measured the covariance matrix of the fields generated in an integrated third-order optical parametric oscillator operating above threshold. We observed up to $(2.3 \pm 0.3)$ dB of squeezing in amplitude difference, inferred $(4.9 \pm 0.7)$ dB of on-chip squeezing, while an excess of noise for the sum of conjugated quadratures hinders the entanglement. The degradation of amplitude correlations and state purity for the increasing of the pump power is consistent with the observed growth of the phase noise of the fields, showing the necessity of strategies for phase noise control aiming at entanglement generation in these systems. |
| title | Quantum State Tomography in a Third-Order Integrated Optical Parametric Oscillator |
| topic | Quantum Physics Optics |
| url | https://arxiv.org/abs/2502.07589 |