Symmetry Protected Two-Photon Coherence Time
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arXiv
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| Hauptverfasser: | , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866916294092128256 |
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| author | Lai, Xuanying Li, Christopher Zanders, Alan Mei, Yefeng Du, Shengwang |
| author_facet | Lai, Xuanying Li, Christopher Zanders, Alan Mei, Yefeng Du, Shengwang |
| contents | We report the observation of symmetry protected two-photon coherence time of biphotons generated from backward spontaneous four-wave mixing in laser-cooled $^{87}$Rb atoms. When biphotons are nondegenerate, non-symmetric photonic absorption loss results in exponential decay of the temporal waveform of the two-photon joint probability amplitude, leading to shortened coherence time. In contrast, in the case of degenerate biphotons, when both paired photons propagate with the same group velocity and absorption coefficient, the two-photon coherence time, protected by space-time symmetry, remains unaffected by medium absorptive losses. Our experimental results validate these theoretical predictions. This outcome highlights the pivotal role of symmetry in manipulating and controlling photonic quantum states. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_13028 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Symmetry Protected Two-Photon Coherence Time Lai, Xuanying Li, Christopher Zanders, Alan Mei, Yefeng Du, Shengwang Quantum Physics We report the observation of symmetry protected two-photon coherence time of biphotons generated from backward spontaneous four-wave mixing in laser-cooled $^{87}$Rb atoms. When biphotons are nondegenerate, non-symmetric photonic absorption loss results in exponential decay of the temporal waveform of the two-photon joint probability amplitude, leading to shortened coherence time. In contrast, in the case of degenerate biphotons, when both paired photons propagate with the same group velocity and absorption coefficient, the two-photon coherence time, protected by space-time symmetry, remains unaffected by medium absorptive losses. Our experimental results validate these theoretical predictions. This outcome highlights the pivotal role of symmetry in manipulating and controlling photonic quantum states. |
| title | Symmetry Protected Two-Photon Coherence Time |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2406.13028 |