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<p>The realization of long-distance quantum communication and the envisioned quantum internet relies on coherent hybrid light-matter interfaces connecting quantum light emitters with quantum memory (QM) systems. Unlike probabilistic photon pair sources such as spontaneous parametric down-conversion, deterministic quantum light emitters enable the on-demand production of pure and bright single- and entangled- photons, essential for scalable quantum networks. In this work, we present the first experimental realization of a coherent hybrid light-matter interface between a chip-integrated InAsP/InP nanowire quantum dot (QD) and a solid-state QM based on Er<sup>3+</sup> ions doped in a glass silica fiber (erbium-doped fiber, EDF). The emission spectrum of the InAsP/InP nanowire QD aligns with the absorption bandwidth of the EDF at 980 nm at cryogenic temperatures, allowing efficient interaction between the two systems. To demonstrate this, we present a spectroscopic characterization of the <sup>4</sup><InlineEquation ID="IEq1"><EquationSource Format="TEX">\({I}_{\frac{15}{2}}\leftrightarrow\)</EquationSource><EquationSource Format="MATHML"><math><mrow><msub><mrow><mi>I</mi></mrow><mrow><mfrac><mrow><mn>15</mn></mrow><mrow><mn>2</mn></mrow></mfrac></mrow></msub><mo>↔</mo></mrow></math></EquationSource></InlineEquation><sup>4</sup><InlineEquation ID="IEq2"><EquationSource Format="TEX">\({I}_{\frac{11}{2}}\)</EquationSource><EquationSource Format="MATHML"><math><msub><mrow><mi>I</mi></mrow><mrow><mfrac><mrow><mn>11</mn></mrow><mrow><mn>2</mn></mrow></mfrac></mrow></msub></math></EquationSource></InlineEquation> optical transition in EDF at 980 nm. Our measurements reveal substantial inhomogeneous broadening of this optical transition and a long spin population lifetime, underscoring EDF’s potential for broadband QM implementation. We implement an 8 GHz bandwidth multimode QM based on the Atomic Frequency Comb protocol, enabling the storage and retrieval of 59 weak coherent pulses. Furthermore, we characterize single-photon emission from an InAsP/InP nanowire QD at 980 nm and demonstrate its deterministic storage and recall in the EDF QM. Notably, this is achieved without spectral tuning of the QD emission, demonstrating its direct compatibility with a solid-state QM.</p>

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Erbium-doped fiber quantum memory for chip-integrated quantum-dot single photons at 980 nm

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  • 发表日期：

    2026年7月11日

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  • Nasser Gohari Kamel,
  • Arsalan Mansourzadeh,
  • Ujjwal Gautam,
  • Vinaya Kumar Kavatamane,
  • Ashutosh Singh,
  • Edith Yeung,
  • David B. Northeast,
  • Paul E. Barclay,
  • Philip J. Poole,
  • Dan Dalacu,
  • Daniel Oblak

摘要

The realization of long-distance quantum communication and the envisioned quantum internet relies on coherent hybrid light-matter interfaces connecting quantum light emitters with quantum memory (QM) systems. Unlike probabilistic photon pair sources such as spontaneous parametric down-conversion, deterministic quantum light emitters enable the on-demand production of pure and bright single- and entangled- photons, essential for scalable quantum networks. In this work, we present the first experimental realization of a coherent hybrid light-matter interface between a chip-integrated InAsP/InP nanowire quantum dot (QD) and a solid-state QM based on Er3+ ions doped in a glass silica fiber (erbium-doped fiber, EDF). The emission spectrum of the InAsP/InP nanowire QD aligns with the absorption bandwidth of the EDF at 980 nm at cryogenic temperatures, allowing efficient interaction between the two systems. To demonstrate this, we present a spectroscopic characterization of the 4\({I}_{\frac{15}{2}}\leftrightarrow\)I152↔4\({I}_{\frac{11}{2}}\)I112 optical transition in EDF at 980 nm. Our measurements reveal substantial inhomogeneous broadening of this optical transition and a long spin population lifetime, underscoring EDF’s potential for broadband QM implementation. We implement an 8 GHz bandwidth multimode QM based on the Atomic Frequency Comb protocol, enabling the storage and retrieval of 59 weak coherent pulses. Furthermore, we characterize single-photon emission from an InAsP/InP nanowire QD at 980 nm and demonstrate its deterministic storage and recall in the EDF QM. Notably, this is achieved without spectral tuning of the QD emission, demonstrating its direct compatibility with a solid-state QM.