HardwareSuperconducting
Rigetti Cepheus-1-108Q
108physical qubits
12×9-qubit chiplet architecture; 99.1% median 2Q fidelity at general availability.
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Quantum scorecard
Rigetti
SuperconductingRigetti ships Cepheus-1-108Q, 108 physical qubits, announced Apr 2026.
Latest activity on record: Oct 17, 2026
Published figures
Each figure names its device and links to where it was published.
Qubit count over time
15 announced devices, by announcement date. Records such as logical-qubit demonstrations are listed below, not plotted. The line traces the largest device to date.
Every milestone on record
15 entries, newest first.
| Date | Device |
|---|---|
| Apr 2026 | Cepheus-1-108Q12×9-qubit chiplet architecture; 99.1% median 2Q fidelity at general availability.108 physical qubitscuratedSource — Cepheus-1-108Q |
| Aug 2025 | Ankaa-3108 physical qubitscuratedSource — Ankaa-3 |
| Dec 2023 | Ankaa-284 physical qubitsWikipediaSource — Ankaa-2 |
| Aug 2023 | Aspen-M-384 physical qubitscuratedSource — Aspen-M-3 |
| Aug 2022 | Aspen-M-280 physical qubitsWikipediaSource — Aspen-M-2 |
| Feb 2022 | Aspen-M-180 physical qubitsWikipediaSource — Aspen-M-1 |
| Dec 2021 | Aspen-1140 physical qubitsWikipediaSource — Aspen-11 |
| Nov 2021 | Aspen-1032 physical qubitsWikipediaSource — Aspen-10 |
| Feb 2021 | Aspen-932 physical qubitsWikipediaSource — Aspen-9 |
| May 2020 | Aspen-831 physical qubitsWikipediaSource — Aspen-8 |
| Nov 2019 | Aspen-728 physical qubitsWikipediaSource — Aspen-7 |
| Mar 2019 | Aspen-413 physical qubitsWikipediaSource — Aspen-4 |
| Nov 2018 | Aspen-116 physical qubitsWikipediaSource — Aspen-1 |
| Jun 2018 | Agave8 physical qubitsWikipediaSource — Agave |
| Dec 2017 | Acorn19 physical qubitsWikipediaSource — Acorn |
curated: from the code-reviewed milestone list, sourced to the vendor · reviewed: a news-surfaced milestone an editor published · Wikipedia: synced from Wikipedia's list of quantum processors.
System benchmarks on real hardware
metriq-gym runs from the Unitary Foundation's metriq-data dataset, newest run per device. Each benchmark has its own direction; scores do not compare across benchmarks.
higher is better · qubits
- Rigetti Ankaa-3
- 6Oct 19, 2025
- Rigetti Cepheus-1 (108q)
- 5Jul 24, 2026
lower is better · eplg
- Rigetti Cepheus-1 (108q)
- 0.095Jul 24, 2026
higher is better · approx-ratio
- Rigetti Cepheus-1 (108q)
- 0.00e+0Jul 24, 2026
higher is better · polarization
- Rigetti Cepheus-1 (108q)
- 0.00e+0Aug 4, 2026
higher is better · accuracy
- Rigetti Cepheus-1 (108q)
- 0.00e+0Jul 24, 2026
higher is better · expectation
- Rigetti Cepheus-1 (108q)
- 0.5363Jul 15, 2026
Funding rounds in the ledger
Extracted from news coverage and de-duplicated; amounts as published.
| Date | Round | Amount | Source |
|---|---|---|---|
| Oct 15, 2026 | VentureRigetti Computing | $100M | Inside Quantum Technology ↗ |
| Sep 24, 2026 | GrantRigetti Computing | $5M | foreignpolicyjournal.com ↗ |
| Sep 14, 2026 | GrantRigetti Computing | $100M | Quantum Computing Report ↗ |
Recent headlines
- Open Quantum Launches Native Qrisp Integration for High-Level QPU Execution Across IonQ, Rigetti, IQM, and AQT HardwareQuantum Computing Report · Oct 17, 2026
- Quantum Computing Stocks Rebound After Dilution Scare: IonQ and Rigetti Climb 3%, D - Wave Advances 2%247wallst.com · Oct 15, 2026
- Rigetti says scaling quantum means complex tasks, fast resultsQuantum Zeitgeist · Oct 12, 2026
Not on record for Rigetti yet: a published roadmap, a live fleet API.
Quantum · Timeline
Rigetti, in order
Everything the site tracks for Rigetti — hardware, records, advantage claims it took part in, funding and its own roadmap — newest first.
Newest on the timeline
Lanes and years
Jump to year
20261 event
20251 event
- HardwareSuperconducting
Rigetti Ankaa-3
108physical qubits
20232 events
- HardwareSuperconducting
Rigetti Ankaa-2
84physical qubits
- HardwareSuperconducting
Rigetti Aspen-M-3
84physical qubits
20222 events
- HardwareSuperconducting
Rigetti Aspen-M-2
80physical qubits
- HardwareSuperconducting
Rigetti Aspen-M-1
80physical qubits
20213 events
- HardwareSuperconducting
Rigetti Aspen-11
40physical qubits
- HardwareSuperconducting
Rigetti Aspen-10
32physical qubits
- HardwareSuperconducting
Rigetti Aspen-9
32physical qubits
20201 event
- HardwareSuperconducting
Rigetti Aspen-8
31physical qubits
20192 events
- HardwareSuperconducting
Rigetti Aspen-7
28physical qubits
- HardwareSuperconducting
Rigetti Aspen-4
13physical qubits
20182 events
- HardwareSuperconducting
Rigetti Aspen-1
16physical qubits
- HardwareSuperconducting
Rigetti Agave
8physical qubits
20171 event
- HardwareSuperconducting
Rigetti Acorn
19physical qubits
That is the whole timeline: 15 events.
Sources
What the units count
- Physical qubits
- The hardware qubits on the device, before any error correction.
- Atoms
- Neutral-atom vendors count the atoms trapped in the array; each one can act as a physical qubit.
- Algorithmic qubits (AQ)
- IonQ's own system-level metric: the widest circuit at which a fixed set of benchmark algorithms still succeeds. No other vendor publishes it.
- Logical qubits
- Error-corrected qubits, each encoded across many physical ones. The codes differ between demonstrations, so two records rarely mean the same thing.
- Quantum volume
- A system-level score (a power of two) from square random circuits. Vendors run it under their own assumptions.
- Two-qubit gate fidelity
- How often a two-qubit gate does what it should, as a percent. The cards show the best published figure, with its device and source.