Experimental entanglement swapping through single-photon $χ^{(2)}$ nonlinearity
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866912671240028160 |
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| author | Tsujimoto, Yoshiaki Wakui, Kentaro Kishimoto, Tadashi Miki, Shigehito Yabuno, Masahiro Terai, Hirotaka Fujiwara, Mikio Kato, Go |
| author_facet | Tsujimoto, Yoshiaki Wakui, Kentaro Kishimoto, Tadashi Miki, Shigehito Yabuno, Masahiro Terai, Hirotaka Fujiwara, Mikio Kato, Go |
| contents | In photonic quantum information processing, quantum operations using nonlinear photon-photon interactions are vital for implementing two-qubit gates and enabling faithful entanglement swapping. However, due to the weak interaction between single photons, the all-photonic realization of such quantum operations has remained out of reach so far. Herein, we demonstrate an entanglement swapping using sum-frequency generation between single photons in a $χ^{(2)}$-nonlinear optical waveguide. We show that a high signal-to-noise ratio~(SNR), stable sum-frequency-generation-based entanglement heralder with an ultralow-dark-count superconducting single-photon detector can satisfy the unprecedented SNR requirement indispensable for the swapping protocol. Furthermore, the system clock is enhanced by utilizing ultrafast telecom entangled photon-pair sources that operate in the GHz range. Our results confirm a lower bound 0.770(76) for the swapped state's fidelity, surpassing the classical limit of 0.5 successfully. Our findings highlight the strong potential of broadband all-single-photonic nonlinear interactions for further sophistication in long-distance quantum communication and photonic quantum computation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_17267 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Experimental entanglement swapping through single-photon $χ^{(2)}$ nonlinearity Tsujimoto, Yoshiaki Wakui, Kentaro Kishimoto, Tadashi Miki, Shigehito Yabuno, Masahiro Terai, Hirotaka Fujiwara, Mikio Kato, Go Quantum Physics In photonic quantum information processing, quantum operations using nonlinear photon-photon interactions are vital for implementing two-qubit gates and enabling faithful entanglement swapping. However, due to the weak interaction between single photons, the all-photonic realization of such quantum operations has remained out of reach so far. Herein, we demonstrate an entanglement swapping using sum-frequency generation between single photons in a $χ^{(2)}$-nonlinear optical waveguide. We show that a high signal-to-noise ratio~(SNR), stable sum-frequency-generation-based entanglement heralder with an ultralow-dark-count superconducting single-photon detector can satisfy the unprecedented SNR requirement indispensable for the swapping protocol. Furthermore, the system clock is enhanced by utilizing ultrafast telecom entangled photon-pair sources that operate in the GHz range. Our results confirm a lower bound 0.770(76) for the swapped state's fidelity, surpassing the classical limit of 0.5 successfully. Our findings highlight the strong potential of broadband all-single-photonic nonlinear interactions for further sophistication in long-distance quantum communication and photonic quantum computation. |
| title | Experimental entanglement swapping through single-photon $χ^{(2)}$ nonlinearity |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2411.17267 |