Aqumen Seeker
Quantum Circuits Inc. (acquired by D-Wave, Jan 2026)
Aqumen Seeker
Register profile — the machine's variant of its architecture
qubit type: dual-rail cavity qubit with erasure conversion; photon loss is heralded
gate mechanism: native sqrt(X), Z, CZ; ~500 ns CZ
connectivity: planar
control: room-temperature control; Real-Time Control Flow (mid-circuit measurement, conditional branching, qubit reuse, fast feedback)
control placement: room-temp
readout: three-outcome readout 0 / 1 / * exposed to the user; erasure detection efficiency >90%
gate evidence: a benchmark paper with its protocol
codes: dual_rail
flags: no code named
Technologies by layer — the machine's cell per layer
| 1 Qubit carrier | Bosonic cavity mode · primary ▣ Fig. 1a (dual-rail pairs of 3D λ/4 coaxial cavities) ✅ dual-rail cavity qubit: 8 qubits = 16 superconducting microwave resonators, photon loss heralded; T1 > 1 ms (2024) |
| 2 Encoding | Dual-rail (erasure) encoding · primary ▣ Fig. 1a,c (dual-rail cavity pairs; photon population per basis state) ✅ one photon shared between two cavities per qubit; loss leaves the codespace as heralded erasure, ~0.5% erasure per CZ (Aug 2026) |
| 3 Gate mechanism | Ancilla-mediated bosonic gates (cat CX, dual-rail CZ, beamsplitter) · primary ▣ Fig. 1b (SWS CZ gate sequence via flux-pumped SQUID coupler); §The SWS CZ gate; Fig. 2 ✅ native √X, Z, CZ; ~500 ns CZ, post-selected infidelity 2.9×10⁻⁴, ~0.5% erasure/gate, bit-flip ~1e-6 (Nature, Aug 2026) |
| 4 Connectivity / transport | Static nearest-neighbour lattice · primary ▣ Fig. 1a (middle SQUID transmon coupler between two dual-rail qubits) ✅ planar nearest-neighbour coupling, degree 4 (register); 8 dual-rail qubits |
| 5 Control | Room-temperature electronics + per-qubit coax/flex · primary ▤ 🔎 room-temperature control; Real-Time Control Flow: mid-circuit measurement, conditional branching, qubit reuse, fast feedback |
| 6 Readout | Mid-circuit erasure check · primary ▣ Fig. 1a (per-cavity SPAM transmon + readout resonator); Fig. 2c, Fig. 3a (erasure fraction) ✅ three-outcome readout 0 / 1 / * exposed to the user; erasure detection efficiency >90% (2024) Dispersive microwave readout (+TWPA, Purcell) · alternate ▣ Fig. 1a (readout resonator per cavity for SPAM) 🔎 three-outcome readout 0 / 1 / * exposed to the user; erasure detection efficiency >90% |
| 7 Code | Erasure-adapted codes · primary ▤ Methods: QEC benefits of structured noise; leakage propagation and delayed erasure checks in a dual-rail surface code; Fig. 4 🔎 dual_rail hardware erasure detection with error-detected gates; no code demonstrated (L1); logical qubit from 5 dual-rail qubits claimed |
| 8 Decoder | |
| 9 Interconnect | Multi-chip modules / l-couplers (same cryostat) · primary ▤ 🔎 multi-chip superconducting packaging with local cryogenic control claimed (D-Wave), no numbers published |
| 10 Manufacturing | 3D machined superconducting cavities · primary ◌ 🔎 superconducting microwave cavities, two per dual-rail qubit (16 resonators for 8 qubits) |
Standard records
2Q error under full-width parallel operation → 2.90e-4 · best-of-line (post-selected CZ infidelity; erasure ~5e-3 per gate, bit-flip ~1e-6)
Aug 2026 · source
QND fidelity / survival → 0.9 · best (erasure detection efficiency)
2024 · source
T1 relaxation → 1.0 ms · best
2024 · source
evidence: ✅ 5 / 12