Maryland / Duke Quantum Center (EURIQA lineage)
University of Maryland / Duke University
Maryland / Duke Quantum Center (EURIQA lineage)
Register profile — the machine's variant of its architecture
qubit type: hyperfine qubit
gate mechanism: laser Molmer-Sorensen
connectivity: chain bus
control: free-space addressed laser control
control placement: room-temp + free-space optics
readout: fluorescence
gate evidence: no published figure
decoder mode: offline — syndromes decoded after the run
codes: bacon_shor, shor_nine, stab_4_2_2
flags: code and technology disagree
Technologies by layer — the machine's cell per layer
| 1 Qubit carrier | Trapped atomic ion · primary ▣ Fig. 1 (Bacon–Shor on 15-ion chain); Methods: Experimental implementation ✅ 13–32 ¹⁷¹Yb⁺ ions in a chain (EURIQA class); 13 ions for the Bacon–Shor run (Oct 2021) |
| 2 Encoding | Hyperfine / clock-state qubit · primary ▤ Methods: Native ion-trap single-qubit gates ✅ ¹⁷¹Yb⁺ hyperfine qubit (family-determined) |
| 3 Gate mechanism | Mølmer–Sørensen / light-shift laser gate · primary ▤ Methods: Native ion-trap two-qubit gates ✅ laser Mølmer–Sørensen gates on the ¹⁷¹Yb⁺ chain |
| 4 Connectivity / transport | Ion-chain motional bus (all-to-all in chain) · primary ▣ Fig. 1 (9 data + 4 ancilla qubits mapped onto one 15-ion chain) ✅ single-chain motional bus (13 ions, degree 12); weight-2 subsystem checks cheap on one chain |
| 5 Control | Free-space laser addressing of ions (AOM/AOD beams) · primary ▤ Methods: Experimental implementation ✅ free-space addressed laser control; room-temp + free-space optics |
| 6 Readout | Fluorescence state detection (ions, defects) · primary ▤ Methods: Experimental implementation ✅ fluorescence (family-determined) |
| 7 Code | — (Atlas gap: ∅G-subsystem) · primary ▣ Fig. 1 (Bacon–Shor [[9,1,3]] layout); Fig. 2 (FT logical state prep, magic states) ✅ Bacon–Shor [[9,1,3]] subsystem code on 13 ions: FT prep, FT measurement, logical rotation, magic state above distillation threshold (Oct 2021) |
| 8 Decoder | MWPM / Sparse Blossom (+ correlated matching) · primary ▤ Methods: Error Correction Protocol ✅ matching; offline correction of Bacon–Shor syndromes (Oct 2021) |
| 9 Interconnect | Ion–photon link · primary ▤ 🔎 Duke: remote ion–ion entanglement at 250 s⁻¹ (O'Reilly et al., 2024); the 9.7 s⁻¹ / teleported-CZ 86% figures are Oxford's [I15] |
| 10 Manufacturing | Ion-trap fabrication (surface-electrode chips; machined 3D blade traps) · primary ▤ Methods: Experimental implementation ✅ ion-trap fabrication (family-determined) |
Standard records
code rate k/n → 250 per s · best (remote ion-ion Bell pairs, 94-97% fidelity)
against a requirement of at least 1e4 per second · 2024 · source
SPAM error → 6.00e-3 · typical
Oct 2021 · source
evidence: ✅ 9 / 10