Alice & Bob Helium (on-premise system)
Alice & Bob Helium (on-premise system)
Register profile — the machine's variant of its architecture
qubit type: dissipatively stabilised cat qubits
gate mechanism: bosonic gates; Felis SDK compiles noise-biased instruction sets
connectivity: 1-D repetition code for phase flips
control: room-temperature control; self-contained cabinet ~40 kW, 18-25 C
control placement: room-temp
readout: dispersive
gate evidence: no published figure
codes: cat_repetition, two-legged-cat
flags: cryogenic details missing, no logical error rate
Technologies by layer — the machine's cell per layer
| 1 Qubit carrier | Bosonic cavity mode · primary ▥ Fig. 'A Cat Qubit Zoom-In' (sapphire chip, resonator, buffer); Fig. 'The Helium Chip' (16 cat qubits, 72 ports); §The Hardware Behind Cat Qubits ✅ 18 dissipatively stabilised cat qubits encoding 1 logical qubit (on-prem system, Jun 2026); next chip 48 cats |
| 2 Encoding | Cat-code encoding (biased noise) · primary ▥ §More Than a Pendulum: Cat's Autonomous Stabilization; §Bit-Flips Protection Record; Fig. 'Exponential Suppression of Bit-Flips on Boson 4' ✅ two-legged cat encoding across 18 cats; no logical error rate published for the logical qubit |
| 3 Gate mechanism | Ancilla-mediated bosonic gates (cat CX, dual-rail CZ, beamsplitter) · primary ▥ §MILESTONE 2 Challenge 1: Mirror the Phase (CNOT); §MILESTONE 1 Challenge 3: Run Cat Qubit Operations; §MILESTONE 4 Challenge 1: Create Magic States (Toffoli) ✅ bosonic gates; Felis SDK compiles noise-biased instruction sets |
| 4 Connectivity / transport | Static nearest-neighbour lattice · primary ▥ Fig. 'The Helium Chip' (16 cat qubits connected in a looped line); Fig. 'Surface Code vs Cat Qubit Architecture' (1-D phase-flip correction); §Cats' Hardware Efficiency: Repetition Code and LDPC Connectivity ✅ 1-D repetition code for phase flips across the 18-cat chip |
| 5 Control | Room-temperature electronics + per-qubit coax/flex · primary ▥ §The Hardware Behind Cat Qubits (72 ports, microwave delivery, 10 mK dilution refrigerator) 🔎 room-temperature control; self-contained on-prem cabinet ~40 kW, 18–25 °C, 45–65% RH, <60 dB (Jun 2026) |
| 6 Readout | Dispersive microwave readout (+TWPA, Purcell) · primary ▥ §MILESTONE 2 Challenge 2: Count the Flips (X measurement of auxiliary cats detects phase-flips) 🔎 dispersive readout |
| 7 Code | Bosonic concatenation (repetition-cat, LDPC-cat, GKP+qLDPC) · primary ▥ §Cats' Hardware Efficiency: Repetition Code and LDPC Connectivity; §MILESTONE 2: Build a Logical Qubit; Fig. 'Error Rate vs Qubit Count for Logical Qubits' ✅ cat repetition code: 18 cats → 1 logical qubit (Jun 2026); no logical error rate published |
| 8 Decoder | — none — nothing in this layer ▥ §MILESTONE 4 Challenge 2: Correct Errors, Live ✅ no decoder published for any Alice & Bob device |
| 9 Interconnect | — none — nothing in this layer ▥ §MILESTONE 3 Challenge 1: Connect Logical Qubits ✅ monolithic single module in a self-contained cabinet, no interconnect |
| 10 Manufacturing | Superconducting-qubit lithography (Al/AlOx/Al junctions, Nb wiring, 300 mm) · primary ▥ §The Hardware Behind Cat Qubits (sapphire chips with printed superconducting circuits; Ta/Al resonator); §MILESTONE 1 Challenge 1: Herd the Cats (nanofabrication) ✅ planar superconducting cat-qubit chip: printed superconducting circuits on sapphire, Ta/Al resonators; fab process not published |
evidence: ✅ 8 / 10
Pictures
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