Robust Ion-Photon Entanglement via Polarization-to-Time-Bin Conversion

• URL: http://arxiv.org/abs/2607.07805v1
• Date: Wed, 08 Jul 2026 18:00:05 GMT
• Title: Robust Ion-Photon Entanglement via Polarization-to-Time-Bin Conversion
• Abstract summary: Time-bin photonic qubits are well-suited for quantum network applications.<n>We implement the first entanglement-preserving polarization-to-time-bin conversion of a photon qubit in an entangled state with a matter qubit.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Time-bin photonic qubits are well-suited for quantum network applications due to their robustness to polarization instability in fiber links and potential for heterogeneous networks. In this work, we implement the first entanglement-preserving polarization-to-time-bin conversion of a photon qubit in an entangled state with a matter qubit. Photons initially generated with polarization encoding are converted to the time-bin basis through a polarization-discriminating asymmetric Mach-Zehnder interferometer. The photonic qubits are generated via the $1092$ nm transition of a $^{88}$Sr$^{+}$ ion. We measure state fidelity bounds of $0.906 \pm 0.011 \le \mathcal{F} \le 0.934\pm 0.011$, with conversion error $< 0.028$, and find this fidelity is unaffected by depolarizing noise even at full depolarization strength.

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