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Current Applied Physics

Progress of quantum entanglement in a trapped-ion based quantum computer

Dahyun Yum, Taeyoung Choi

Published Jun 23, 2022• 6 citations
Publisher
DOI
10.1016/j.cap.2022.06.011

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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.
A trapped ion quantum computer usually uses the motional modes of the ion crystal to exchange quantum information and to generate entanglement. As the number of ions in a trap is increased, the motional modes become progressively more complicated and their energy spacing is reduced. This makes the entangling operation increasingly difficult. An alternative method for a trapped-ion quantum computer may be realised by exciting some of the ions to Rydberg states. The large polarizability of Rydberg ions modifies the trapping potential thus allows tailoring the motional modes for entanglement operations [1]. Additionally entangling gates may be realised using the dipole interaction between Rydberg ions, without using motional modes at all [2,3].