neutral-ytterbium QPU
neutral-ytterbium QPU
architecture: Rydberg tweezer array — alkaline-earth(-like) (Yb/Sr), erasure-native · Open on the map
Register profile — the machine's variant of its architecture
qubit type: ytterbium neutral-atom qubit
gate mechanism: Rydberg-blockade CZ
connectivity: all-to-all connectivity, long coherence
control: laser control; fast neutral-Yb imaging (17.6 us at 99.89% discrimination, Kyoto) is the enabling readout
control placement: optics (room temperature)
readout: fast atom-array readout
gate evidence: no published figure
decoder mode: planned — named in a roadmap only
codes: rotated_surface
flags: no published error rates
Technologies by layer — the machine's cell per layer
| 1 Qubit carrier | Alkaline-earth(-like) atom (Yb/Sr) — erasure-native · primary ▨ ✅ ytterbium neutral atoms; STAR hardware validation began Aug 2026; physical qubit count not disclosed |
| 2 Encoding | Hyperfine / clock-state qubit · primary ◌ 🔎 Yb ground-state (hyperfine / nuclear-spin) qubit — family-determined; encoding not stated in sources |
| 3 Gate mechanism | Rydberg-blockade CZ · primary ▨ 🔎 Rydberg-blockade CZ; no gate fidelity disclosed; STAR Ver.3 relaxes required physical error rate from 1e-4 to 1e-3 (Mar 2026) |
| 4 Connectivity / transport | Atom transport by AOD tweezers (zoned architecture) · primary ▨ ✅ all-to-all connectivity with long coherence; a QEC round includes atom transport |
| 5 Control | Laser + AOD/SLM optical control (atoms) · primary ▨ 🔎 laser control, room-temperature optics; no control-stack details published |
| 6 Readout | Fluorescence imaging of atom arrays · primary ◌ 🔎 fluorescence imaging; no readout figure published by Yaqumo |
| 7 Code | Rotated surface code (+ yoked variants) · primary ▨ 🔎 rotated surface code; STAR Cliffords via surface-code lattice surgery; target >several hundred qubits with QEC by FY2027 |
| 8 Decoder | MWPM / Sparse Blossom (+ correlated matching) · primary ▨ ✅ PyMatching v2 (MWPM), inherited from STAR; real-time decoding planned |
| 9 Interconnect | |
| 10 Manufacturing | Optical / mechanical assembly (lasers, vacuum, objectives) · primary ◌ 🔎 room-temperature optical / laser / vacuum assembly; builder not stated |
evidence: ✅ 3 / 10