Evidence of the quantum-optical nature of high-harmonic generation
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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| author | Theidel, David Cotte, Viviane Sondenheimer, René Shiriaeva, Viktoriia Froidevaux, Marie Severin, Vladislav Mosel, Philip Merdji-Larue, Adam Fröhlich, Sven Weber, Kim-Alessandro Morgner, Uwe Kovacev, Milutin Biegert, Jens Merdji, Hamed |
| author_facet | Theidel, David Cotte, Viviane Sondenheimer, René Shiriaeva, Viktoriia Froidevaux, Marie Severin, Vladislav Mosel, Philip Merdji-Larue, Adam Fröhlich, Sven Weber, Kim-Alessandro Morgner, Uwe Kovacev, Milutin Biegert, Jens Merdji, Hamed |
| contents | High-harmonic generation is a light up-conversion process occurring in a strong laser field, leading to coherent bursts of extreme ultrashort broadband radiation [1]. As a new perspective, we propose that ultrafast strong-field electronic or photonic processes such as high-harmonic generation can potentially generate non-classical states of light well before the decoherence of the system occurs [2, 3]. This could address fundamental challenges in quantum technology such as scalability, decoherence or the generation of massively entangled states [4]. Here, we report experimental evidence of the non-classical nature of the harmonic emission in several semiconductors excited by a femtosecond infrared laser. By investigating single- and double beam intensity cross-correlation [5], we measure characteristic, non-classical features in the single photon statistics. We observe two-mode squeezing in the generated harmonic radiation, which depends on the laser intensity that governs the transition from Super-Poissonian to Poissonian photon statistics. The measured violation of the Cauchy-Schwarz inequality realizes a direct test of multipartite entanglement in high-harmonic generation [6]. This result is supported by the theory of multimodal detection and the Hamiltonian from which the effective squeezing modes of the harmonics can be derived [7, 8]. With this work, we show experimentally that high-harmonic generation is a new quantum bosonic platform that intrinsically produces non-classical states of light with unique features such as multipartite broadband entanglement or multimode squeezing. The source operates at room temperature using standard semiconductors and a standard commercial fiber laser, opening new routes for the quantum industry, such as optical quantum computing, communication and imaging. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2405_15022 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Evidence of the quantum-optical nature of high-harmonic generation Theidel, David Cotte, Viviane Sondenheimer, René Shiriaeva, Viktoriia Froidevaux, Marie Severin, Vladislav Mosel, Philip Merdji-Larue, Adam Fröhlich, Sven Weber, Kim-Alessandro Morgner, Uwe Kovacev, Milutin Biegert, Jens Merdji, Hamed Quantum Physics High-harmonic generation is a light up-conversion process occurring in a strong laser field, leading to coherent bursts of extreme ultrashort broadband radiation [1]. As a new perspective, we propose that ultrafast strong-field electronic or photonic processes such as high-harmonic generation can potentially generate non-classical states of light well before the decoherence of the system occurs [2, 3]. This could address fundamental challenges in quantum technology such as scalability, decoherence or the generation of massively entangled states [4]. Here, we report experimental evidence of the non-classical nature of the harmonic emission in several semiconductors excited by a femtosecond infrared laser. By investigating single- and double beam intensity cross-correlation [5], we measure characteristic, non-classical features in the single photon statistics. We observe two-mode squeezing in the generated harmonic radiation, which depends on the laser intensity that governs the transition from Super-Poissonian to Poissonian photon statistics. The measured violation of the Cauchy-Schwarz inequality realizes a direct test of multipartite entanglement in high-harmonic generation [6]. This result is supported by the theory of multimodal detection and the Hamiltonian from which the effective squeezing modes of the harmonics can be derived [7, 8]. With this work, we show experimentally that high-harmonic generation is a new quantum bosonic platform that intrinsically produces non-classical states of light with unique features such as multipartite broadband entanglement or multimode squeezing. The source operates at room temperature using standard semiconductors and a standard commercial fiber laser, opening new routes for the quantum industry, such as optical quantum computing, communication and imaging. |
| title | Evidence of the quantum-optical nature of high-harmonic generation |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2405.15022 |