Metrological detection of entanglement generated by non-Gaussian operations

• URL: http://arxiv.org/abs/2301.03909v2
• Date: Tue, 16 Jan 2024 17:49:49 GMT
• Title: Metrological detection of entanglement generated by non-Gaussian operations
• Authors: David Barral, Mathieu Isoard, Giacomo Sorelli, Manuel Gessner, Nicolas Treps, Mattia Walschaers
• Abstract summary: Entanglement and non-Gaussianity are physical resources essential for quantum-optics protocols. Non-Gaussian entanglement is indispensable for quantum-computing advantage. We propose a simple protocol for witnessing entanglement in an important class of non-Gaussian entangled states: photon-subtracted states.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Entanglement and non-Gaussianity are physical resources that are essential for a large number of quantum-optics protocols. Non-Gaussian entanglement is indispensable for quantum-computing advantage and outperforms its Gaussian counterparts in a number of quantum-information protocols. The characterization of non-Gaussian entanglement is a critical matter as it is in general highly demanding in terms of resources. We propose a simple protocol based on the Fisher information for witnessing entanglement in an important class of non-Gaussian entangled states: photon-subtracted states. We demonstrate that our protocol is relevant for the detection of non-Gaussian entanglement generated by multiple photon-subtraction and that it is experimentally feasible through homodyne detection.

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