Observation of Subnatural-Linewidth Biphotons In a Two-Level Atomic Ensemble
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866910792178204672 |
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| author | Lin, Jyun-Kai Chien, Tzu-Hsiang Wu, Chin-Te Chinnarasu, Ravikumar Du, Shengwang Yu, Ite A. Chuu, Chih-Sung |
| author_facet | Lin, Jyun-Kai Chien, Tzu-Hsiang Wu, Chin-Te Chinnarasu, Ravikumar Du, Shengwang Yu, Ite A. Chuu, Chih-Sung |
| contents | Biphotons and single photons with narrow bandwidths and long coherence times are essential to the realization of long-distance quantum communication (LDQC) and linear optical quantum computing (LOQC). In this Letter, we manipulate the biphoton wave functions of the spontaneous four-wave mixing in a two-level atomic ensemble with a single-laser pump scheme. Our innovative experimental approach enables the generation of biphotons with a sub-MHz bandwidth of 0.36 MHz, a record spectral brightness of $2.28\times10^7$${\rm s}^{-1}{\rm mW}^{-1}{\rm MHz}^{-1}$, and a temporally symmetric wave packet at moderate optical depth. The strong non-classical cross-correlation of the biphotons also enables the observation of heralded sub-MHz-linewidth single photons with a pronounced single-photon nature. The generation of sub-MHz-linewidth biphotons and single photons with a two-level atomic ensembles not only finds applications in quantum repeaters and large cluster states for LDQC and LOQC but also opens up the opportunity to miniaturize the biphoton or single-photon sources for chip-scale quantum technologies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_11908 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Observation of Subnatural-Linewidth Biphotons In a Two-Level Atomic Ensemble Lin, Jyun-Kai Chien, Tzu-Hsiang Wu, Chin-Te Chinnarasu, Ravikumar Du, Shengwang Yu, Ite A. Chuu, Chih-Sung Atomic Physics Quantum Physics Biphotons and single photons with narrow bandwidths and long coherence times are essential to the realization of long-distance quantum communication (LDQC) and linear optical quantum computing (LOQC). In this Letter, we manipulate the biphoton wave functions of the spontaneous four-wave mixing in a two-level atomic ensemble with a single-laser pump scheme. Our innovative experimental approach enables the generation of biphotons with a sub-MHz bandwidth of 0.36 MHz, a record spectral brightness of $2.28\times10^7$${\rm s}^{-1}{\rm mW}^{-1}{\rm MHz}^{-1}$, and a temporally symmetric wave packet at moderate optical depth. The strong non-classical cross-correlation of the biphotons also enables the observation of heralded sub-MHz-linewidth single photons with a pronounced single-photon nature. The generation of sub-MHz-linewidth biphotons and single photons with a two-level atomic ensembles not only finds applications in quantum repeaters and large cluster states for LDQC and LOQC but also opens up the opportunity to miniaturize the biphoton or single-photon sources for chip-scale quantum technologies. |
| title | Observation of Subnatural-Linewidth Biphotons In a Two-Level Atomic Ensemble |
| topic | Atomic Physics Quantum Physics |
| url | https://arxiv.org/abs/2501.11908 |