JION

Raveh Neeman

doi:10.5281/zenodo.22674814

eleQtron + Forschungszentrum Julich · trapped ions · DEPLOYED (3 Sep 2026) · 30 physical qubits · access: JUNIQ user infrastructure, coupled to JUPITER

architecture: Trapped ions — electronic qubit control (laser-free, microwave-driven gates) · Open on the map

Register profile — the machine's variant of its architecture

qubit type: hyperfine qubit

gate mechanism: MAGIC (Magnetic Gradient Induced Coupling): microwaves plus a static magnetic-field gradient, no gate lasers, no dilution refrigerator, room temperature

connectivity: chain bus

control: chip microwave sources; individual addressing by microwave pulse frequency

control placement: on-chip microwave, room temperature

readout: fluorescence

gate evidence: no published figure

flags: no published error rates

Technologies by layer — the machine's cell per layer

1 Qubit carrier	Trapped atomic ion · primary ▣ Fig. 2 (spin-spin coupling vs number of 171Yb+ ions in a chain); §II ✅ 30 ¹⁷¹Yb⁺ ions (pilot system); deployed 3 Sep 2026 at Jülich Supercomputing Centre on JUNIQ, coupled to JUPITER
2 Encoding	Hyperfine / clock-state qubit · primary ▤ §II Effective spin-spin interaction (qubit states \|F=0,mF=0> and \|F=1,mF=+1> of the hyperfine ground manifold) ✅ ¹⁷¹Yb⁺ ground-state hyperfine qubit; family-determined, no machine-specific encoding source
3 Gate mechanism	Electronic microwave gate (ions, laser-free: near-field or static gradient) · primary ▣ Fig. 1 (MAGIC scheme with magnetic-field gradient); §II ✅ MAGIC: microwaves + static magnetic-field gradient, no gate lasers, no dilution refrigerator, room temperature; no gate fidelity disclosed at launch
4 Connectivity / transport	Ion-chain motional bus (all-to-all in chain) · primary ▣ Fig. 2 (gradient-induced spin-spin coupling strengths J_ij across a 1-D chain) ✅ chain bus over 30 ions (degree 29); topology details not published
5 Control	Chip-integrated microwave control (ions) · primary ▤ §I Introduction; §II (microwaves instead of lasers address ions and implement gates) ✅ microwave control, individual addressing by microwave pulse frequency; on-chip microwave, room temperature
6 Readout	Fluorescence state detection (ions, defects) · primary ◌ 🔎 fluorescence readout; family-determined, no readout fidelity disclosed
7 Code	— none — nothing in this layer ▨ 🔎 no QEC code run; no gate fidelity disclosed at launch
8 Decoder	— none — nothing in this layer ▨ 🔎 no decoder; no QEC run
9 Interconnect	— none — nothing in this layer ◌ 🔎 single 30-ion module, no interconnect
10 Manufacturing	Ion-trap fabrication (surface-electrode chips; machined 3D blade traps) · primary ◌ 🔎 surface-electrode ion-trap microfabrication; family-determined, no machine-specific fab source

evidence: ✅ 5 / 10