Heterogeneous entanglement between a trapped ion and a solid-state quantum memory

• URL: http://arxiv.org/abs/2603.05836v1
• Date: Fri, 06 Mar 2026 02:44:40 GMT
• Title: Heterogeneous entanglement between a trapped ion and a solid-state quantum memory
• Abstract summary: Hybrid quantum networks offer a promising architecture for scalable quantum information processing and a future quantum internet.<n>We demonstrate a hybrid quantum network that entangles a single trapped $mathrm171Yb+$ ion and achieves a quantum memory based on $rm 153Eu3+!Y_SiO5$ crystal over a 75-m separation.<n>This work establishes entanglement between a quantum processing module with a multiplexed quantum memory node, representing a key step toward a scalable, multifunctional quantum internet.
• Score: 18.022941619093235
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Hybrid quantum networks offer a promising architecture for scalable quantum information processing and a future quantum internet, as they can combine the complementary strengths of disparate physical platforms. While single-atom systems provide deterministic quantum logic gates, atomic ensembles enable large-capacity quantum storage. However, generating entanglement between such heterogeneous systems has remained an open challenge, primarily due to fundamental spectral mismatches and system complexity. Here, we demonstrate a hybrid quantum network that entangles a single trapped $\mathrm{^{171}Yb^{+}}$ ion and a quantum memory based on $\rm ^{153}Eu^{3+}\colon\!Y_2SiO_5$ crystal over a 75-m separation. Using polarization-maintaining quantum frequency conversion, we map spin-photon entanglement onto a hybrid entanglement between a single spin qubit and a collective excitation of the quantum memory. The resulting entangled state achieves a fidelity of $(89.21 \pm 2.23)\%$ and violates the CHSH-Bell inequality by 6 standard deviations ($S = 2.328 \pm 0.055$), confirming nonlocality between two heterogeneous nodes. This work establishes entanglement between a quantum processing module with a multiplexed quantum memory node, representing a key step toward a scalable, multifunctional quantum internet.

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