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Bulletin of the American Physical Society

Towards Using Trapped Ions as Memory Nodes in a Photon-mediated Quantum Network

Jameson P. O'Reilly, Jackson Bell, Daniela F. Bogorin, Benjamin Bonenfant, Paul R. Cook, Savannah M. Decker, Lester Disney, Tyler Dolezal, Benjamin Driesen, Paige Haas, Nicholas Hougland, David Hucul, Brad Liu, Samuel Marthage, Brennal Nelson, Justin Phillips, K. M. Poole, Brandon Robinson, Harris J. Rutbeck-Goldman, Laura Wessing, Kathy-Anne Soderberg

Published Mar 5, 2019• 0 citations
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Trapped ions are one of the leading platforms for quantum computation and networking, with long coherence times and high fidelity qubit operation. We exploit these attributes to build a quantum network with the use of three trapped ion modules connected via photonic links. In each of these systems, we have ions of different species for use as memory or communication qubits. Our newest module contains two high NA=0.8 objectives, each covering 20% of the solid angle of photons emitted from the ion, making it suitable for use as the middle node of the network. Photons are collected from each chamber, and we generate remote entanglement between each pair of nodes by interfering the photons on a beamsplitter. This heralds entanglement of the communication ions in the pair of network nodes, which we then swap onto the memory qubits. I will discuss our progress towards creating a Greenberger–Horne–Zeilinger (GHZ) state between the memory ions in the three nodes.
We integrate a long-lived memory qubit into a mixed-species trapped-ion quantum network node. Ion-photon entanglement first generated with a network qubit in ^{88}Sr^{+} is transferred to ^{43}Ca^{+} with 0.977(7) fidelity, and mapped to a robust memory qubit. We then entangle the network qubit with a second photon, without affecting the memory qubit. We perform quantum state tomography to show that the fidelity of ion-photon entanglement decays ∼70 times slower on the memory qubit. Dynamical decoupling further extends the storage duration; we measure an ion-photon entanglement fidelity of 0.81(4) after 10 s.