KRISS domestic superconducting QPU

Raveh Neeman

doi:10.5281/zenodo.22674814

Korea Research Institute of Standards and Science

KRISS domestic superconducting QPU

Korea Research Institute of Standards and Science · superconducting circuits · DEPLOYED (20-qubit computer and its cloud demonstration, KRISS 21 Jul 2026) (Jul 2026) · 20 physical qubits · access: cloud (pilot)

architecture: Transmon lattice with tunable couplers · Open on the map

Register profile — the machine's variant of its architecture

qubit type: transmon

gate mechanism: tunable coupler (assumed)

connectivity: not published

control: room-temperature RF

control placement: room-temp

readout: dispersive

gate evidence: no published figure

flags: no published error rates, source not confirmed

Technologies by layer — the machine's cell per layer

1 Qubit carrier	Transmon · primary ▨ 🔎 transmon; 20-qubit-class processor, cloud pilot for domestic researchers from H2 2026; 50-qubit class targeted during 2026
2 Encoding	Bare physical qubit (no encoding) · primary ◌ 🔎 bare transmon two-level subspace; no encoding beyond the physical qubit
3 Gate mechanism	Tunable-coupler CZ / iSWAP · primary ▨ 🔎 tunable coupler (assumed); no gate mechanism or fidelities published
4 Connectivity / transport	Static nearest-neighbour lattice · primary ▨ 🔎 nearest-neighbour lattice assumed; no topology published
5 Control	Room-temperature electronics + per-qubit coax/flex · primary ▨ 🔎 room-temperature RF; room-temp
6 Readout	Dispersive microwave readout (+TWPA, Purcell) · primary ◌ 🔎 dispersive readout; no readout fidelity published
7 Code	— none — nothing in this layer ▨ 🔎 no QEC code run; NISQ device (L0)
8 Decoder	— none — nothing in this layer ▨ 🔎 no decoder; no QEC run
9 Interconnect	— none — nothing in this layer ◌ 🔎 monolithic single module, no interconnect
10 Manufacturing	Superconducting-qubit lithography (Al/AlOx/Al junctions, Nb wiring, 300 mm) · primary ◌ 🔎 superconducting-qubit lithography; no machine-specific fab source 300 mm CMOS foundry (spins, cryo-CMOS, superconducting wiring) · alternate ▨ 🔎 national fabs: KAIST National Quantum Fab Research Institute (launched Dec 2025, operational 2028); UNIST Quantum Nano Fab (opened 13 Jun 2026)

evidence: ✅ 0 / 11