Gemini-class
Gemini-class
Register profile — the machine's variant of its architecture
qubit type: hyperfine clock qubit
gate mechanism: Rydberg-blockade CZ; 20 simultaneous two-qubit pairs; repetition rate 1 shot per second
connectivity: two zones - storage (long coherence) and entanglement - with atoms moved between them by AOD tweezers
control: SLM tweezers + AOD moves + Rydberg lasers
control placement: optics (room temperature)
readout: fluorescence imaging; SPAM/readout 99.7%
gate evidence: a published figure (source class not yet tagged)
decoder mode: offline — syndromes decoded after the run
codes: 488_color, concatenated_steane, stab_5_1_3, steane
Technologies by layer — the machine's cell per layer
| 1 Qubit carrier | Alkali atom (Rb/Cs) in optical tweezers · primary ▣ Fig. 1c (atom images, 85 qubits); Extended Data Fig. 1a ✅ 87Rb hyperfine clock qubit; 260 physical atoms; deployed 2025 (cloud and on-premise) |
| 2 Encoding | Hyperfine / clock-state qubit · primary ▤ Methods: System overview 🔎 87Rb ground-state hyperfine clock qubit |
| 3 Gate mechanism | Rydberg-blockade CZ · primary ▣ Extended Data Fig. 1b (Rydberg-blockade entangling layers) ✅ Rydberg-blockade CZ; 2Q global 99.2% with 20 simultaneous pairs; 1Q global 99.9%, local 99.7%; 1 shot/s (2025) |
| 4 Connectivity / transport | Atom transport by AOD tweezers (zoned architecture) · primary ▣ Extended Data Fig. 2; Fig. 1c (right); Extended Data Fig. 1c ✅ storage zone + entanglement zone, atoms moved between them by AOD tweezers; all-to-all by rearrangement (degree 259) |
| 5 Control | Laser + AOD/SLM optical control (atoms) · primary ▣ Extended Data Fig. 2 (SLM/AOD trap arrays); Methods: System overview ✅ SLM tweezers + AOD moves + Rydberg lasers; room-temperature optics |
| 6 Readout | Fluorescence imaging of atom arrays · primary ▣ Extended Data Fig. 1d (global measurement); Fig. 1c (averaged images) ✅ fluorescence imaging; SPAM/readout 99.7% (2025) |
| 7 Code | Colour code (transversal Cliffords) · primary ▣ Fig. 2b (d=3 colour-code stabilizers); Fig. 4a,b (d=5) ✅ 488 color codes d=3 and d=5 with Harvard/MIT; 5 d=5 logical qubits plus two d=3 factories (Jul 2025) High-rate concatenated codes with transversal gates · alternate ▤ 🔎 alternate technology; no high-rate code reported — demonstrated code is 488 color (d=3/d=5) Magic-state factory (cultivation / distillation / code switching) · alternate ▣ Fig. 3 (5-to-1 MSD); Fig. 1b; Fig. 4c,d ✅ logical-level 5-to-1 magic-state distillation on 488 color codes; output fidelity better than every input, absolute value not published (Jul 2025) |
| 8 Decoder | Correlated / loss-aware decoding (transversal, atom loss) · primary ▣ Fig. 3b (MLE vs MLD); Extended Data Fig. 4; Methods: Decoding and post-selection ✅ correlated / loss-aware decoding; offline MWPM / Sparse Blossom (+ correlated matching) · alternate ▤ 🔎 alternate technology; primary decoding is correlated / loss-aware, offline |
| 9 Interconnect | — none — nothing in this layer ◌ 🔎 single vacuum cell, no interconnect; ic_atomcavity is the stated path, nothing built |
| 10 Manufacturing | Optical / mechanical assembly (lasers, vacuum, objectives) · primary ◌ 🔎 room-temperature optical/vacuum assembly (lasers, vacuum cell, objectives) |
Standard records
connectivity degree → 259 neighbours · best (all-to-all by rearrangement)
2025 · source
2Q error under full-width parallel operation → 8.00e-3 · typical with 20 pairs active
2025 · source
code rate k/n → 1 shots/s · typical (repetition rate)
2025 · source
SPAM error → 3.00e-3 · typical
2025 · source
evidence: ✅ 8 / 13