Catalog — QPU record · Quandela · Photonic
Ascella (MosaiQ 6)
Ascella (MosaiQ 6) is a photonic gate-based processor by Quandela with 6 qubits (2022). Below: every publicly disclosed figure with its source, method, and vendor-claim status — plus what is not disclosed, recorded as findings.
Measurement records7 disclosed · 3 not disclosed · 3 sources
Select a figure to open its record
Qubit count (qubit_count_physical)6 fully entangled photonic qubits (12 optical modes)vendor claim
Vendor claim
- Method
- VENDOR_UNSPECIFIED
- Notes
- Vendor page: '6 fully entangled qubits', 12 modes. Matches Nature Photonics paper: 'six photonic qubits generated by an on-demand quantum dot source' on a 12-mode universal circuit.
- Citation key
[quandela/ascella:qubit-count-physical:2026-08-19]
Single-qubit gate quality (one_qubit_gate_fidelity)99.6 ± 0.1 %vendor claim
Vendor claim
- Source
- A versatile single-photon-based quantum computing platform (Nature Photonics 18, 603-609) · published 2024-03-26
- Method
- Reported for a one-qubit T gate in the peer-reviewed platform paper; measurement method not captured from the retrieved text
- Aggregation
- not stated
- Notes
- Same figure on vendor spec page and in Nature Photonics 18, 603-609 (peer-reviewed, Quandela-authored).
- Citation key
[quandela/ascella:one-qubit-gate-fidelity:2026-08-19]
Two-qubit gate quality (two_qubit_gate_fidelity)99.0 ± 0.8 %sources conflict
Conflicting sources
- Method
- Vendor spec-sheet figure; method and aggregation not stated on product page
- Aggregation
- not stated
- Notes
- Vendor product page states '(99.0 ± 0.8)%' 2-qubit gate fidelity, while the peer-reviewed Nature Photonics paper reports a CNOT gate fidelity of '93.8 ± 0.6%'. The two figures likely reflect different gates/metrics or methods, but the vendor page states no method, so recorded as CONFLICTING.
- Citation key
[quandela/ascella:two-qubit-gate-fidelity:2026-08-19]
Readout (readout_fidelity)99 %vendor claim
Vendor claim
- Method
- not stated
- Aggregation
- not stated
- Citation key
[quandela/ascella:readout-fidelity:2026-08-19]
Single photon source performance (single_photon_source_performance)InAs quantum dot in micropillar cavity; 55% brightness (probability into collection lens); two-photon interference visibility 91-94% across all 15 qubit pairsvendor claim
Vendor claim
- Source
- A versatile single-photon-based quantum computing platform (Nature Photonics 18, 603-609) · published 2024-03-26
- Method
- Two-photon (Hong-Ou-Mandel-type) interference visibility measured across all 15 photon pairs
- Aggregation
- range across all 15 pairs
- Notes
- Peer-reviewed, Quandela-authored.
- Citation key
[quandela/ascella:single-photon-source-per:2026-08-19]
Six photon sampling rate (six_photon_sampling_rate)4 Hzvendor claim
Vendor claim
- Source
- A versatile single-photon-based quantum computing platform (Nature Photonics 18, 603-609) · published 2024-03-26
- Method
- VENDOR_UNSPECIFIED
- Citation key
[quandela/ascella:six-photon-sampling-rate:2026-08-19]
Quantum operations per second (quantum_operations_per_second)144 QOPSvendor claim
Vendor claim
- Method
- QOPS is a Quandela-defined marketing metric; definition not stated on the page
- Notes
- System is air-cooled, 3 kW main-system power consumption (vendor page).
- Citation key
[quandela/ascella:quantum-operations-per-s:2026-08-19]
Coherence (coherence_times_T1_T2)not publicly disclosed
Not publicly disclosed — checked 2026-08-19
- Finding
- No public disclosure found. This is a recorded, dated finding — we do not substitute an estimate or borrow a figure from a sibling device.
- Sources queried
- Quandela Ascella product page (fetched), Nature Photonics paper (fetched)
- Notes
- Not applicable/not published for flying photonic qubits.
Gate duration (two_qubit_gate_duration)not publicly disclosed
Not publicly disclosed — checked 2026-08-19
- Finding
- No public disclosure found. This is a recorded, dated finding — we do not substitute an estimate or borrow a figure from a sibling device.
- Sources queried
- Quandela Ascella product page (fetched), Nature Photonics paper (fetched)
Product line successors (product_line_successors)MosaiQ line: Ascella (MosaiQ 6, 6 qubits), Belenos (MosaiQ 12, 12 qubits, 24 modes, 576 QOPS, quoted 1Q fidelity (99.6 ± 0.1)%, 2Q (99.0 ± 0.8)%, readout 99%, 8 kW, all-to-all, MosaiqOS), Canopus (MosaiQ 24, 24 qubits)vendor claim
Vendor claim
- Method
- Belenos vendor QPU page states methods/aggregations for none of the fidelity figures
- Aggregation
- not stated
- Notes
- Belenos launched May 2025; vendor page: 'The first fully integrated version will be delivered in a supercomputer at the end of 2025' (EuroHPC/GENCI at CEA TGCC per launch coverage). Belenos claims '4,000 times more computing power than the previous generation'. See also https://www.quandela.com/products-and-services/mosaiq/ ('Order quantum computers from 6 up to 24 qubits now').
- Citation key
[quandela/ascella:product-line-successors:2026-08-19]
Pricing model (pricing_model)not publicly disclosed
Not publicly disclosed — checked 2026-08-19
- Finding
- No public disclosure found. This is a recorded, dated finding — we do not substitute an estimate or borrow a figure from a sibling device.
- Sources queried
- quandela.com MosaiQ page (fetched), Ascella product page (fetched), Belenos QPU page (fetched)
- Notes
- Cloud offers exist ('Access quantum processors, simulators, and algorithms in direct access or via our partners') but no pricing model (subscription vs pay-per-use) is disclosed on the fetched pages.
QPU137 is independent and is not affiliated with, endorsed by, or sponsored by Quandela. Figures above are public disclosures recorded with their sources on 2026-08-19; vendor claims are labeled as such and may not be directly comparable across measurement methods — see methodology.