Libra

Raveh Neeman

doi:10.5281/zenodo.22674814

QuEra

Libra

QuEra · neutral atoms · PLANNED (2028 (Amazon Braket)) · 10000 physical qubits · access: cloud

architecture: Rydberg tweezer array — alkali (Rb/Cs) · Open on the map

Register profile — the machine's variant of its architecture

qubit type: hyperfine clock-state qubit

gate mechanism: transversal logical operations; mid-circuit active reloading; parallel atom shuttling

connectivity: zoned architecture with parallel shuttling; room-temperature vacuum cell

control: SLM tweezers + AOD moves + Rydberg lasers

control placement: optics (room temperature)

readout: fluorescence imaging

gate evidence: no published figure

decoder mode: planned — named in a roadmap only

flags: a target, not a device

Technologies by layer — the machine's cell per layer

1 Qubit carrier	Alkali atom (Rb/Cs) in optical tweezers · primary ▨ 🔎 hyperfine clock-state qubit (alkali atoms); planned 2028
2 Encoding	Hyperfine / clock-state qubit · primary ◌ 🔎 ground-state hyperfine clock-state qubit (planned)
3 Gate mechanism	Rydberg-blockade CZ · primary ▨ ✅ transversal logical operations with mid-circuit active reloading and parallel atom shuttling (planned 2028)
4 Connectivity / transport	Atom transport by AOD tweezers (zoned architecture) · primary ▨ ✅ zoned architecture with parallel atom shuttling; room-temperature vacuum cell (planned 2028)
5 Control	Laser + AOD/SLM optical control (atoms) · primary ▨ 🔎 SLM tweezers + AOD moves + Rydberg lasers; room-temperature optics
6 Readout	Fluorescence imaging of atom arrays · primary ◌ 🔎 fluorescence imaging
7 Code	Algorithmic FT / transversal architectures · primary ▨ ✅ high-rate QEC encoding with transversal logical operations; planned 2028 on Amazon Braket High-rate concatenated codes with transversal gates · alternate ▨ 🔎 qLDPC with rate >1/2 (~2.7:1 memory-only); target 256 logical from >10,000 physical, logical error 1e-6 (2028)
8 Decoder	Correlated / loss-aware decoding (transversal, atom loss) · primary ▨ 🔎 correlated / loss-aware decoding; real-time planned GPU decoding via NVQLink · alternate ▨ 🔎 alternate technology; decoder planned (correlated / loss-aware), no GPU detail published
9 Interconnect	— undisclosed — exists, nothing published ◌ 🔎 inter-module link not specified
10 Manufacturing	Optical / mechanical assembly (lasers, vacuum, objectives) · primary ◌ 🔎 room-temperature vacuum-cell optical assembly (planned)

evidence: ✅ 3 / 12