Jen-Yueh Hsiao Quantum Control Systems Engineer
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Hardware extension directions

Transport within a trap and entanglement across modules

Extension target · QCCD

Ion shuttling

Move ions from one zone to another inside the same trap. Ions can wait or be sorted elsewhere on the track. In H2, the lower operation zones support cooling, gates, and readout. The controller would move the ions by changing electrode voltages and check that they arrived before starting the next step.

Simplified H2 racetrack. Loading and storage are on the left curve, sorting is on the upper row, and operations are on the lower row. Load Storage Sorting Operations & readout Idle ions Load ions

1 / 7 · Loading Laser light ionizes neutral atoms at the load hole. The trap captures the resulting ions.

Teaching schematic based on Moses et al., H2 Fig. 2 and §II. The simplified route follows two qubit ions. Coolant ions, extra zones and real timing are omitted.

Measurements for validationTransport success rate, motional excitation and gate fidelity after transport.

Pino et al. · QCCD demonstration · Nature (2021)
Extension target · modular networking

Photonic interconnect

Use photons to connect separate quantum modules. Detecting the photons can signal that the modules now share entanglement. The controller would retry if the signal did not arrive in time and use the link to coordinate operations across the modules.

Optical paths for a link between two trapped-ion modules or between a trapped ion and a diamond memory. Ion A module Ion B module Photon interference Diamond SiV memory Photon conversion Detection Waiting for an attempt

Ion ↔ Ion Each module sends a photon. A matching detection pattern signals shared entanglement.

Teaching schematic. The checkbox selects the demo outcome. The playback speed and outcome do not represent measured link performance.

Remote CZ between trapped-ion modulesMain and colleagues used heralded entanglement between two trapped-ion modules to teleport a CZ gate between their circuit qubits, with 86.2(9)% average gate fidelity. Main et al. · Nature (2025)

Trapped ion to solid-state memoryHartung and colleagues (IonQ and Duke) entangled a trapped 138Ba+ ion with a silicon-vacancy center (SiV−) in diamond. They generated heralded Bell pairs at 1.03(1) kHz with 87.9(7)% Bell-state fidelity. Hartung et al. · arXiv preprint (2026)

Measurements for validationMeasure the heralded entanglement rate and Bell-state fidelity for the link. If the link is used to execute a remote gate, measure that gate’s fidelity separately.