MAQCS

Raveh Neeman

doi:10.5281/zenodo.22674814

planqc · neutral atoms · PLANNED / under construction (first hardware at LRZ since 9-10 Sep 2026; operation as an HPC co-processor by end-2027) (Sep 2026 (hardware delivered); end-2027 (operation)) · 1000 physical qubits · access: on-prem (LRZ, DLR Ulm)

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: strontium optical clock-transition qubit - coherence 10-100 ms, three orders below the hyperfine figures in the same layer

gate mechanism: Rydberg-blockade CZ; >60 coherent Rabi cycles

connectivity: atoms held in a regular grid by an optical lattice ("an egg carton made of light") rather than individually placed tweezers; multi-core with sequential atom reloading

control: lattice + Rydberg laser control

control placement: optics (room temperature)

readout: fluorescence imaging

gate evidence: no published figure

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 ▨ ✅ strontium optical clock-transition qubit; coherence 10–100 ms
2 Encoding	Optical narrow-line qubit (ion S–D, atom clock) · primary ▨ 🔎 strontium qubits, coherence in the tens of ms (Sr 1S0–3P0 clock qubit per register; the transition is not named on the page)
3 Gate mechanism	Rydberg-blockade CZ · primary ▨ ✅ Rydberg-blockade CZ; >60 coherent Rabi cycles
4 Connectivity / transport	— (Atlas gap: ∅G-lattice) · primary ▨ ✅ no Atlas node: optical-lattice grid ('egg carton made of light'), no per-atom tweezer moves; 1,200-atom register ran >1 h continuously (Oct 2024)
5 Control	Laser + AOD/SLM optical control (atoms) · primary ▨ 🔎 lattice + Rydberg laser control; room-temperature optics
6 Readout	Fluorescence imaging of atom arrays · primary ◌ 🔎 fluorescence imaging
7 Code	— none — nothing in this layer ▨ 🔎 no QEC code; NISQ device
8 Decoder	— none — nothing in this layer ▨ 🔎 no decoder; no QEC run
9 Interconnect	— undisclosed — exists, nothing published ▨ ✅ link between two interlinked 500-qubit MAQCS cores (LRZ, ~2027); mechanism not disclosed
10 Manufacturing	Optical / mechanical assembly (lasers, vacuum, objectives) · primary ◌ 🔎 room-temperature optical-lattice assembly (lasers, vacuum, objectives)

Standard records

T2 coherence (echo/DD) → 100 ms · typical (upper end of 10-100 ms for a clock qubit)

three orders below the hyperfine figures in the same layer · 2026 · source

evidence: ✅ 4 / 10