metastable Yb-171 erasure array
metastable Yb-171 erasure array
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: metastable Yb-171 ("omg") erasure-converted qubit - the only encoding in this register chosen so that errors announce themselves
gate mechanism: Rydberg-blockade CZ; 38(6)% of CZ errors detected as erasures
connectivity: tweezer array with AOD transport; ~50% of transport loss detected mid-circuit
control: SLM/AOD laser control
control placement: optics (room temperature)
readout: mid-circuit erasure check (20 us for Yb atoms)
gate evidence: no published figure
decoder mode: offline — syndromes decoded after the run
codes: stab_4_2_2, yb_erasure
Technologies by layer — the machine's cell per layer
| 1 Qubit carrier | Alkaline-earth(-like) atom (Yb/Sr) — erasure-native · primary ▣ Fig. 1a (storage/gate zones with metastable 171Yb qubits) ✅ metastable 171Yb ('omg') erasure-converted qubit in a tweezer array; lab-only |
| 2 Encoding | Metastable ('omg') erasure encoding · primary ▣ Fig. 1 (3P0 qubit; leakage to 1S0 detected via 1P1 imaging) ✅ metastable 'omg' erasure encoding; unconditional decoding gain 1.9(4)× (post-selected 3.6(1)×) |
| 3 Gate mechanism | Rydberg-blockade CZ · primary ▣ Fig. 2 (amplitude-robust CZ gates) ✅ Rydberg-blockade CZ; 38(6)% of CZ errors detected as erasures |
| 4 Connectivity / transport | Atom transport by AOD tweezers (zoned architecture) · primary ▣ Fig. 1a,e (AOD coherent transport, polarization); §II Results ✅ AOD tweezer transport; ~50% of transport loss detected mid-circuit; teleportation fidelity 0.802(8) |
| 5 Control | Laser + AOD/SLM optical control (atoms) · primary ▣ Fig. 1a (SLM static traps, orthogonal AODs, FPGA, 302 nm Rydberg beam); §II ✅ SLM/AOD laser control; room-temperature optics |
| 6 Readout | Mid-circuit erasure check · primary ▣ Fig. 1a (EMCCD fast imaging); Fig. 3b, Fig. 4a (mid-circuit erasure checks) ✅ mid-circuit erasure check (20 µs for Yb atoms) Fluorescence imaging of atom arrays · alternate ▣ Fig. 1 caption (fast 1P1 imaging of ground-state leakage) ✅ alternate technology; fluorescence imaging alongside the mid-circuit erasure check |
| 7 Code | Erasure-adapted codes · primary ▣ Fig. 3 ([[4,2,2]] code); §III Discussion (surface-code threshold 0.94%→1.45%) ✅ [[4,2,2]] prep fidelity 0.874(4)→0.902(3) using erasure info; surface-code threshold 0.94%→1.45% at measured erasure fraction |
| 8 Decoder | Correlated / loss-aware decoding (transversal, atom loss) · primary ▣ Fig. 3e (unconditional decoding with erasure information) ✅ erasure/loss-aware decoding, offline; unconditional decoding gain 1.9(4)× |
| 9 Interconnect | |
| 10 Manufacturing | Optical / mechanical assembly (lasers, vacuum, objectives) · primary ◌ 🔎 room-temperature optical/vacuum assembly (lasers, vacuum cell, objectives) |
Standard records
acceptance fraction → 1 · best (the 1.9(4)x decoding gain is unconditional)
the post-selected 3.6(1)x is not the architecturally relevant number · Jun 2026 · source
leakage per gate → 0.38 · best (fraction of CZ errors converted to erasures)
threshold rises from 0.94% to 1.45% · Jun 2026 · source
evidence: ✅ 9 / 11
Pictures
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