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VTT Q50

VTT Technical Research Centre of Finland

VTT Q50

VTT Technical Research Centre of Finland · superconducting circuits · DEPLOYED (Mar 2025) · 50 physical qubits · access: cloud service (VTT QX) for companies and research institutions; connected to the LUMI supercomputer
architecture: Transmon lattice with tunable couplers · Open on the map

Register profile — the machine's variant of its architecture

qubit type: flux-tunable superconducting qubits (transmon type not stated)
gate mechanism: not published; flux-tunable couplers
connectivity: lattice topology
flags: no published error rates

Technologies by layer — the machine's cell per layer

1 Qubit carrier
Transmon · primary ▨ 🔎
superconducting flux-tunable qubits, 50 (53 on the infrastructure page), co-developed with IQM; transmon type not stated
2 Encoding
Bare physical qubit (no encoding) · primary ◌ 🔎
bare two-level subspace; no encoding beyond the physical qubit
3 Gate mechanism
Tunable-coupler CZ / iSWAP · primary ▨ VTT Q50 section ✅
flux-tunable couplers between flux-tunable qubits; 2Q gate type not stated
4 Connectivity / transport
Static nearest-neighbour lattice · primary ▨ VTT Q50 section ✅
qubits arranged in a lattice topology with fixed tunable couplers
5 Control
Room-temperature electronics + per-qubit coax/flex · primary ◌ 🔎
control electronics not published; room-temperature electronics assumed (family)
6 Readout
Dispersive microwave readout (+TWPA, Purcell) · primary ◌ 🔎
dispersive readout assumed (family); no readout data published
7 Code
— none — nothing in this layer ▨ 🔎
no QEC code run; QEC is a target of the planned 300-qubit system
8 Decoder
— none — nothing in this layer ◌ 🔎
no decoder; no QEC run
9 Interconnect
— none — nothing in this layer ◌ 🔎
single QPU in one cryostat; no inter-module link published
10 Manufacturing
Superconducting-qubit lithography (Al/AlOx/Al junctions, Nb wiring, 300 mm) · primary ▨ 🔎
superconducting chip; machine sits at VTT Micronova (Espoo) with in-house cleanroom; chip fab site not stated
evidence: ✅ 2 / 10