Generation of a Three-Ion GHZ-Like State in Ion-Trap Systems

S. Shelly Sharma

李大创, 王先萍, 董萍 +2 more

P. E. Toschek, Sascha Wallentowitz

George Toh, Jameson P. O'Reilly, Sagnik Saha +4 more

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.

P. Toth, Paul Shine Eugine, Alexander Meyer +6 more

This paper presents a fully integrated System-on-Chip operating from 295 K down to 4 K, capable of generating 0.7 GHz to 1.5 GHz microwave signals for9Be+trapped-ion quantum computer realizations. The proposed design comprises a three-channel waveform generator with integrated 48 kbit memory to generate arbitrary envelope-modulated control signals while consuming only 94 mW, which in the targeted system results in 1.9 mW/qubit. The IC is capable of driving multiple electrodes as required for all gate operations. The chip was fabricated in a 0.13µm SiGe BiCMOS technology. To the best of the authors’ knowledge, this is the first reported integrated SoC solution for qubit state control in a trapped-ion quantum computer.

J. D. Sankey, Alan A. Madej