Real-Time Monitoring of Multimode Squeezing

• URL: http://arxiv.org/abs/2503.07486v2
• Date: Tue, 29 Apr 2025 13:29:59 GMT
• Title: Real-Time Monitoring of Multimode Squeezing
• Authors: Mahmoud Kalash, Aditya Sudharsanam, M. H. M. Passos, Valentina Parigi, Maria Chekhova,
• Abstract summary: Multimode squeezed light is a key resource for high-dimensional quantum technologies.<n>We employ multimode optical parametric amplification (MOPA) to achieve real-time monitoring of co-propagating modes of multimode squeezed light.
• Score: 1.2349871196144497
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Multimode squeezed light is a key resource for high-dimensional quantum technologies, enabling applications in metrology, secure communication, and measurement-based quantum computing. So far, its full practical potential remains unrealized due to the limitations of homodyne detection, which is inherently restricted to single-mode operation and, at best, retrieves multimode data through post-processing. Here, we employ multimode optical parametric amplification (MOPA) to, for the first time to the best of our knowledge, achieve real-time monitoring of co-propagating modes of multimode squeezed light. By leveraging simultaneous multimode phase-sensitive amplification followed by mode sorting, we enable real-time detection of nine spatial modes and report high-purity squeezing of up to $7.9 \pm 0.6$ dB, which, as far as we are aware, is the highest squeezing recorded for pulsed light. Furthermore, we propose MOPA for the efficient characterization of cluster states, enabling real-time monitoring of all cluster links. This work completes the set of capabilities needed for robust multimode squeezed light detection and significantly expands its applicability in quantum technologies.

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