Rigetti Ankaa-3

Rigetti Computing · superconducting circuits · DEPLOYED (end-2024) · 84 physical qubits · access: cloud service

qubit type: tunable transmon + tunable couplers

gate mechanism: native iSWAP / CZ

connectivity: square lattice, degree <=4

control: room-temperature RF

control placement: room-temp

readout: dispersive

gate evidence: a published figure (source class not yet tagged)

1 Qubit carrier	Transmon · primary ▨ 🔎 84 tunable transmons with tunable couplers (end-2024)
2 Encoding	Bare physical qubit (no encoding) · primary ◌ 🔎 Bare two-level subspace — Computational subspace of an anharmonic oscillator; leakage to \|2⟩ is the price.
3 Gate mechanism	Tunable-coupler CZ / iSWAP · primary ▨ 🔎 tunable-coupler 2Q gate, native iSWAP / CZ; ~99% median 2Q (end-2024)
4 Connectivity / transport	Static nearest-neighbour lattice · primary ▨ 🔎 84 q square lattice, degree ≤4
5 Control	Room-temperature electronics + per-qubit coax/flex · primary ▨ 🔎 room-temperature RF control
6 Readout	Dispersive microwave readout (+TWPA, Purcell) · primary ◌ 🔎 dispersive
7 Code	— none — nothing in this layer ▨ 🔎 no QEC code run (NISQ); NISQ benchmarking only
8 Decoder	— none — nothing in this layer ▨ 🔎 no decoder (no QEC)
9 Interconnect	— none — nothing in this layer ◌ 🔎 monolithic 84-q single chip, no interconnect
10 Manufacturing	Superconducting-qubit lithography (Al/AlOx/Al junctions, Nb wiring, 300 mm) · primary ◌ 🔎 Rigetti superconducting fab; ABAA post-fab junction frequency trimming (97.4% frequency-targeting success, Aug 2024)

evidence: ✅ 0 / 10