ScQ-136 "Baiwang"

Beijing Academy of Quantum Information Sciences · superconducting circuits · DEPLOYED (2024-) · 136 physical qubits · access: free open-access cloud

qubit type: transmon

gate mechanism: tunable coupler

connectivity: 2-D square lattice

control: room-temperature RF

control placement: room-temp

readout: dispersive

gate evidence: no published figure

flags: no published error rates, source not confirmed

1 Qubit carrier	Transmon · primary ▤ §III.E Backends (ScQ-P136) ✅ ScQ-136 "Baiwang": 136 transmons on BAQIS Quafu free cloud, deployed since 2023
2 Encoding	Bare physical qubit (no encoding) · primary ◌ 🔎 bare transmon \|0⟩/\|1⟩ subspace; family-determined, no machine-specific source
3 Gate mechanism	Tunable-coupler CZ / iSWAP · primary ▤ §III.E Backends (ScQ-P136) ✅ tunable coupler (register); 1Q fidelity "as high as 99%" (ScQ-136); no 2Q data
4 Connectivity / transport	Static nearest-neighbour lattice · primary ▤ §III.E Backends (ScQ-P136) ✅ 2-D square lattice (136 q); no further topology data
5 Control	Room-temperature electronics + per-qubit coax/flex · primary ▨ 🔎 room-temperature RF control (register); no control-stack detail published
6 Readout	Dispersive microwave readout (+TWPA, Purcell) · primary ◌ 🔎 dispersive readout (family-determined); no readout fidelity data
7 Code	— none — nothing in this layer ▨ 🔎 no QEC code found; NISQ cloud device
8 Decoder	— none — nothing in this layer ▨ 🔎 no decoder; no QEC run
9 Interconnect	— none — nothing in this layer ◌ 🔎 monolithic single chip, no interconnect
10 Manufacturing	Superconducting-qubit lithography (Al/AlOx/Al junctions, Nb wiring, 300 mm) · primary ◌ 🔎 superconducting-qubit lithography; family-determined, no machine-specific fab source

evidence: ✅ 3 / 10