Two-photon interference between mutually-detuned resonance fluorescence signals scattered off a semiconductor quantum dot
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arXiv
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866912918442868736 |
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| author | Huang, Guoqi Wang, Jian Zeng, Ziqi Liu, Hanqing Liu, Li Ji, Weijie Wu, Bang Ni, Haiqiao Niu, Zhichuan Jiao, Rongzhen Marangon, Davide G. Yuan, Zhiliang |
| author_facet | Huang, Guoqi Wang, Jian Zeng, Ziqi Liu, Hanqing Liu, Li Ji, Weijie Wu, Bang Ni, Haiqiao Niu, Zhichuan Jiao, Rongzhen Marangon, Davide G. Yuan, Zhiliang |
| contents | The radiative linewidth of a two-level emitter (TLE) fundamentally limits the bandwidth available for quantum information processing. Despite its importance, no prior experiment has systematically examined how driving detuning affects the indistinguishability of photons scattered from a TLE - a parameter critical for photonic quantum computing. Here, we perform post-selective two-photon interference measurements between mutually detuned resonance fluorescence signals from an InAs quantum dot embedded in a micropillar cavity. At small mutual laser detunings (<=0.5GHz), the results are accurately described by the pure-state model [Nat. Commun. 16, 6453 (2025)], which treats all resonance-fluorescence photons as spontaneous emission. At larger detunings, we uncover an anomalous feature in the two-photon interference, where the normalised second-order correlation function under orthogonal polarisations yields g2_vert(0) < 0.5. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2501_16939 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Two-photon interference between mutually-detuned resonance fluorescence signals scattered off a semiconductor quantum dot Huang, Guoqi Wang, Jian Zeng, Ziqi Liu, Hanqing Liu, Li Ji, Weijie Wu, Bang Ni, Haiqiao Niu, Zhichuan Jiao, Rongzhen Marangon, Davide G. Yuan, Zhiliang Quantum Physics Atomic Physics Optics The radiative linewidth of a two-level emitter (TLE) fundamentally limits the bandwidth available for quantum information processing. Despite its importance, no prior experiment has systematically examined how driving detuning affects the indistinguishability of photons scattered from a TLE - a parameter critical for photonic quantum computing. Here, we perform post-selective two-photon interference measurements between mutually detuned resonance fluorescence signals from an InAs quantum dot embedded in a micropillar cavity. At small mutual laser detunings (<=0.5GHz), the results are accurately described by the pure-state model [Nat. Commun. 16, 6453 (2025)], which treats all resonance-fluorescence photons as spontaneous emission. At larger detunings, we uncover an anomalous feature in the two-photon interference, where the normalised second-order correlation function under orthogonal polarisations yields g2_vert(0) < 0.5. |
| title | Two-photon interference between mutually-detuned resonance fluorescence signals scattered off a semiconductor quantum dot |
| topic | Quantum Physics Atomic Physics Optics |
| url | https://arxiv.org/abs/2501.16939 |