Photon-pair generation in a lossy waveguide
An on-chip quantum light source based on spontaneous four-wave mixing is an essential element for developing quantum photonic integrated circuit technology, which has the advantage of no connection loss owing to the integration of the source into photonic circuits. The waveguide-based quantum light...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
De Gruyter
2023-01-01
|
| Series: | Nanophotonics |
| Subjects: | |
| Online Access: | https://doi.org/10.1515/nanoph-2022-0582 |
| _version_ | 1797789015755194368 |
|---|---|
| author | Shin Woncheol Park Kyungdeuk Kim Hyeongpin Lee Dongjin Kwon Kiwon Shin Heedeuk |
| author_facet | Shin Woncheol Park Kyungdeuk Kim Hyeongpin Lee Dongjin Kwon Kiwon Shin Heedeuk |
| author_sort | Shin Woncheol |
| collection | DOAJ |
| description | An on-chip quantum light source based on spontaneous four-wave mixing is an essential element for developing quantum photonic integrated circuit technology, which has the advantage of no connection loss owing to the integration of the source into photonic circuits. The waveguide-based quantum light source inevitably causes propagation loss owing to imperfections in the fabrication process, but the propagation loss effects on photon-pair generation have not been extensively studied. In this study, propagation loss effects were examined using theoretical and experimental methods. In theory, the performance of quantum light sources, such as brightness, heralding efficiency, and coincidence-to-accidental ratio, strongly depend on propagation loss. We fabricate several waveguides with a moderate propagation loss of 2.2 dB/cm to investigate the loss dependence and ascertain that the brightness, heralding efficiency, and coincidence-to-accident ratio strongly correlate with the length of the optical waveguide. The maximum coincidence-count brightness occurred at an optimization length of 1/α, where α is the absorption coefficient. In contrast, the single-count brightness shows slightly different waveguide length dependence owing to loss-induced one-photon states. We expect that the results obtained in this study will greatly assist in determining the proper waveguide length for photon-pair generation according to the source’s application fields. The results will be helpful in the development of a quantum light source suitable for practical and quantum optical integrated circuits and will lead to the development of high-fidelity quantum technologies. |
| first_indexed | 2024-03-13T01:44:48Z |
| format | Article |
| id | doaj.art-83d69cab3e5f41f19bd701411ebd080c |
| institution | Directory Open Access Journal |
| issn | 2192-8606 2192-8614 |
| language | English |
| last_indexed | 2024-03-13T01:44:48Z |
| publishDate | 2023-01-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Nanophotonics |
| spelling | doaj.art-83d69cab3e5f41f19bd701411ebd080c2023-07-03T10:20:08ZengDe GruyterNanophotonics2192-86062192-86142023-01-0112353153810.1515/nanoph-2022-0582Photon-pair generation in a lossy waveguideShin Woncheol0Park Kyungdeuk1Kim Hyeongpin2Lee Dongjin3Kwon Kiwon4Shin Heedeuk5Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang, 37673, KoreaDepartment of Physics, Pohang University of Science and Technology (POSTECH), Pohang, 37673, KoreaDepartment of Physics, Pohang University of Science and Technology (POSTECH), Pohang, 37673, KoreaDepartment of Physics, Pohang University of Science and Technology (POSTECH), Pohang, 37673, KoreaDepartment of Physics, Pohang University of Science and Technology (POSTECH), Pohang, 37673, KoreaDepartment of Physics, Pohang University of Science and Technology (POSTECH), Pohang, 37673, KoreaAn on-chip quantum light source based on spontaneous four-wave mixing is an essential element for developing quantum photonic integrated circuit technology, which has the advantage of no connection loss owing to the integration of the source into photonic circuits. The waveguide-based quantum light source inevitably causes propagation loss owing to imperfections in the fabrication process, but the propagation loss effects on photon-pair generation have not been extensively studied. In this study, propagation loss effects were examined using theoretical and experimental methods. In theory, the performance of quantum light sources, such as brightness, heralding efficiency, and coincidence-to-accidental ratio, strongly depend on propagation loss. We fabricate several waveguides with a moderate propagation loss of 2.2 dB/cm to investigate the loss dependence and ascertain that the brightness, heralding efficiency, and coincidence-to-accident ratio strongly correlate with the length of the optical waveguide. The maximum coincidence-count brightness occurred at an optimization length of 1/α, where α is the absorption coefficient. In contrast, the single-count brightness shows slightly different waveguide length dependence owing to loss-induced one-photon states. We expect that the results obtained in this study will greatly assist in determining the proper waveguide length for photon-pair generation according to the source’s application fields. The results will be helpful in the development of a quantum light source suitable for practical and quantum optical integrated circuits and will lead to the development of high-fidelity quantum technologies.https://doi.org/10.1515/nanoph-2022-0582coincidence-to-accidental ratiophoton-pair generationpropagation lossspontaneous four-wave mixing |
| spellingShingle | Shin Woncheol Park Kyungdeuk Kim Hyeongpin Lee Dongjin Kwon Kiwon Shin Heedeuk Photon-pair generation in a lossy waveguide Nanophotonics coincidence-to-accidental ratio photon-pair generation propagation loss spontaneous four-wave mixing |
| title | Photon-pair generation in a lossy waveguide |
| title_full | Photon-pair generation in a lossy waveguide |
| title_fullStr | Photon-pair generation in a lossy waveguide |
| title_full_unstemmed | Photon-pair generation in a lossy waveguide |
| title_short | Photon-pair generation in a lossy waveguide |
| title_sort | photon pair generation in a lossy waveguide |
| topic | coincidence-to-accidental ratio photon-pair generation propagation loss spontaneous four-wave mixing |
| url | https://doi.org/10.1515/nanoph-2022-0582 |
| work_keys_str_mv | AT shinwoncheol photonpairgenerationinalossywaveguide AT parkkyungdeuk photonpairgenerationinalossywaveguide AT kimhyeongpin photonpairgenerationinalossywaveguide AT leedongjin photonpairgenerationinalossywaveguide AT kwonkiwon photonpairgenerationinalossywaveguide AT shinheedeuk photonpairgenerationinalossywaveguide |