Quantum State Tomography in a Third-Order Integrated Optical Parametric Oscillator

• URL: http://arxiv.org/abs/2502.07589v1
• Date: Tue, 11 Feb 2025 14:38:53 GMT
• Title: Quantum State Tomography in a Third-Order Integrated Optical Parametric Oscillator
• Authors: Roger Alfredo Kögler, Gabriel Couto Rickli, Renato Ribeiro Domeneguetti, Xingchen Ji, Alexander L. Gaeta, Michal Lipson, Marcelo Martinelli, Paulo Nussenzveig,
• Abstract summary: 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. 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.
• Score: 34.82692226532414
• License:
• Abstract: 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.

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