Quantum optical synthesis of high-dimensional ultrafast frequency-bin qudits
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arXiv
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| Format: | Preprint |
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2026
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| author | Koviri, Prasad Okita, Tomoya Yabumoto, Rina Fujihashi, Yuta Yabuno, Masahiro Terai, Hirotaka Miki, Shigehito Nayak, Kali P. Shimizu, Ryosuke |
| author_facet | Koviri, Prasad Okita, Tomoya Yabumoto, Rina Fujihashi, Yuta Yabuno, Masahiro Terai, Hirotaka Miki, Shigehito Nayak, Kali P. Shimizu, Ryosuke |
| contents | Frequency modes of light are one of the most promising platforms that provide access to high-dimensional quantum states amongst different photonic degrees of freedom capable of high-dimensionality, enabling robust, error-tolerant, and scalable quantum optical information systems. We demonstrate engineering of precisely controlled two-photon high-dimensional states entangled in frequency through time-domain Fourier optical synthesis. We generate and convert a continuous broadband frequency-entangled state into a large range of discrete frequency bins suitable for ITU standards, with spacings ranging from 12.5 GHz to 750 GHz, and observe spectral anticorrelations over 38 frequency bins, including intra-bin pure states at a 100 GHz bin spacing. We characterize the full quantum state dimensionality via Schmidt decomposition and observe lower bounds on the frequency-binned Hilbert-space dimensionalities of at least 289, formed by two entangled qudits with dimension 17. Furthermore, we demonstrate quantum nonlocality via frequency correlations in a transmission experiment over a campus-scale two-node fiber network. This work represents a crucial step towards building a versatile and relatively simple way of generating precisely controlled high-dimensional spectral qudits, with the potential of harnessing in wavelength-multiplexed quantum networks, high-dimensional information processing, and communication of quantum states specifically, and fiber-optic quantum remote sensing. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_14314 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Quantum optical synthesis of high-dimensional ultrafast frequency-bin qudits Koviri, Prasad Okita, Tomoya Yabumoto, Rina Fujihashi, Yuta Yabuno, Masahiro Terai, Hirotaka Miki, Shigehito Nayak, Kali P. Shimizu, Ryosuke Quantum Physics Optics Frequency modes of light are one of the most promising platforms that provide access to high-dimensional quantum states amongst different photonic degrees of freedom capable of high-dimensionality, enabling robust, error-tolerant, and scalable quantum optical information systems. We demonstrate engineering of precisely controlled two-photon high-dimensional states entangled in frequency through time-domain Fourier optical synthesis. We generate and convert a continuous broadband frequency-entangled state into a large range of discrete frequency bins suitable for ITU standards, with spacings ranging from 12.5 GHz to 750 GHz, and observe spectral anticorrelations over 38 frequency bins, including intra-bin pure states at a 100 GHz bin spacing. We characterize the full quantum state dimensionality via Schmidt decomposition and observe lower bounds on the frequency-binned Hilbert-space dimensionalities of at least 289, formed by two entangled qudits with dimension 17. Furthermore, we demonstrate quantum nonlocality via frequency correlations in a transmission experiment over a campus-scale two-node fiber network. This work represents a crucial step towards building a versatile and relatively simple way of generating precisely controlled high-dimensional spectral qudits, with the potential of harnessing in wavelength-multiplexed quantum networks, high-dimensional information processing, and communication of quantum states specifically, and fiber-optic quantum remote sensing. |
| title | Quantum optical synthesis of high-dimensional ultrafast frequency-bin qudits |
| topic | Quantum Physics Optics |
| url | https://arxiv.org/abs/2605.14314 |