Academia Sinica 20-qubit superconducting quantum computer
Academia Sinica 20-qubit superconducting quantum computer
Register profile — the machine's variant of its architecture
qubit type: transmon
gate mechanism: not published; laser trimming tunes qubit frequencies post-fabrication
connectivity: not published
control: room-temperature RF; chip stacking to reduce crosstalk
control placement: room-temp
readout: dispersive
gate evidence: no published figure
flags: no published error rates, outlier claim
Technologies by layer — the machine's cell per layer
| 1 Qubit carrier | |
| 2 Encoding | Bare physical qubit (no encoding) · primary ◌ 🔎 bare transmon two-level subspace; no encoding beyond the physical qubit |
| 3 Gate mechanism | — undisclosed — exists, nothing published ▨ 🔎 gate mechanism not published; no 1Q/2Q fidelities and no coupler type published (Jan 2026) |
| 4 Connectivity / transport | Static nearest-neighbour lattice · primary ▨ 🔎 topology not published; static nearest-neighbour on-chip coupling assumed for the 20-qubit chip |
| 5 Control | Room-temperature electronics + per-qubit coax/flex · primary ▨ 🔎 room-temperature RF control; chip stacking used to reduce crosstalk |
| 6 Readout | Dispersive microwave readout (+TWPA, Purcell) · primary ◌ 🔎 dispersive readout; no readout fidelity published |
| 7 Code | |
| 8 Decoder | |
| 9 Interconnect | Multi-die packaging in one module (flip-chip, bump-bonded control die) · primary ▨ 🔎 chip stacking inside one 20-qubit module to reduce crosstalk; no inter-module link |
| 10 Manufacturing | Superconducting-qubit lithography (Al/AlOx/Al junctions, Nb wiring, 300 mm) · primary ▨ 🔎 designed and fabricated in-house on an 8-inch wafer platform built on Taiwan semiconductor process-control expertise |
Standard records
T1 relaxation → 530 µs · best (claimed)
a company release with no accompanying gate fidelity; the release calls it at or beyond the record for multi-qubit transmon processors · Jan 2026 · source
evidence: ✅ 1 / 11