Harvard University

research · research-org · Cambridge, MA, United States · quantum.harvard.edu

Machines in the Atlas (1)

• continuously reloaded 3,000-atom machine — DEMONSTRATED, 3,000 q, Sep 2025 (Nature 646, 1075; arXiv Jun 2025)

Machines it co-developed (filed under another organisation) (1)

• 448-atom fault-tolerant processor — Harvard / MIT / QuEra

Technologies its machines use

• Alkali atom (Rb/Cs) in optical tweezers · 1
• Hyperfine / clock-state qubit · 1
• Rydberg-blockade CZ · 1
• Atom transport by AOD tweezers (zoned architecture) · 1
• Continuous atom reloading (reservoir + optical conveyor belt) · 1
• Laser + AOD/SLM optical control (atoms) · 1
• Fluorescence imaging of atom arrays · 1
• Optical / mechanical assembly (lasers, vacuum, objectives) · 1

Architectures

• Rydberg tweezer array — alkali (Rb/Cs)
• Colour-centre spins — network nodes (NV/SiV/T)

Mentioned in the briefs of

• Rydberg-blockade CZ
• Continuous atom reloading (reservoir + optical conveyor belt)
• Erasure-adapted codes
• Alkali atom (Rb/Cs) in optical tweezers
• Correlated / loss-aware decoding (transversal, atom loss)
• Ground–Rydberg analogue qubit
• Analogue Rydberg Hamiltonian evolution
• Atom transport by AOD tweezers (zoned architecture)
• High-rate concatenated codes with transversal gates
• Algorithmic FT / transversal architectures
• Spin–photon solid-state link (SiV, NV, T centre)
• Magic-state factory (cultivation / distillation / code switching)
• Fluorescence imaging of atom arrays
• Rotated surface code (+ yoked variants)
• Optical / mechanical assembly (lasers, vacuum, objectives)
• Colour-centre / defect spin (NV, SiV, SnV, T centre)
• Metastable ('omg') erasure encoding
• Non-local qLDPC codes (bivariate bicycle, 'gross')
• Neural decoders (AlphaQubit 2, CNN, transformers)
• Photonic IC foundry (SiN, BTO, TFLN, SNSPD on 300 mm)
• Diamond growth / implantation (NV, SiV, SnV)
• Laser + AOD/SLM optical control (atoms)
• Ion–photon link