70-qubit ion quantum computer (FIAN / Rosatom roadmap)

Lebedev Physical Institute (FIAN) and the Russian Quantum Center, Rosatom roadmap · trapped ions · ANNOUNCED (claimed prototype; presented Oct 2025, reported 18 Dec 2025; no paper) (Dec 2025) · 70 physical qubits · access: not disclosed

qubit type: Yb ion qudit (levels per ion not published)

gate mechanism: not published

connectivity: not published

control: not published

readout: not published

gate evidence: no published figure

flags: no published error rates, press sources only, source not confirmed

1 Qubit carrier	Trapped atomic ion · primary ▨ 🔎 cold Yb ions (claimed 50-qubit machine; tests of one- and two-qubit operations and qudit coherence reported Jul 2024)
2 Encoding	Hyperfine / clock-state qubit · primary ▨ 🔎 qudit encoding per ion; levels and qubit mapping not published
3 Gate mechanism	Mølmer–Sørensen / light-shift laser gate · primary ◌ 🔎 laser entangling gate assumed (family-determined); mechanism not published
4 Connectivity / transport	Ion-chain motional bus (all-to-all in chain) · primary ◌ 🔎 linear-chain motional bus assumed; trap layout not published
5 Control	Free-space laser addressing of ions (AOM/AOD beams) · primary ◌ 🔎 free-space laser addressing assumed; not described
6 Readout	Fluorescence state detection (ions, defects) · primary ◌ 🔎 fluorescence state detection (family-determined)
7 Code	— none — nothing in this layer ◌ 🔎 no QEC code reported
8 Decoder	— none — nothing in this layer ◌ 🔎 no decoder; no QEC run
9 Interconnect	— none — nothing in this layer ◌ 🔎 no inter-module link reported
10 Manufacturing	Ion-trap fabrication (surface-electrode chips; machined 3D blade traps) · primary ◌ 🔎 ion-trap fabrication (family-determined); trap type not published

evidence: ✅ 0 / 10