HardwareSuperconducting
CAS Xiaohong
504physical qubits
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Quantum scorecard
CAS
SuperconductingCAS ships Xiaohong, 504 physical qubits, announced Jan 2024.
Latest activity on record: Jan 1, 2024
Published figures
Each figure names its device and links to where it was published.
Qubit count over time
1 announced device, 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
1 entry, newest first.
| Date | Device |
|---|---|
| Jan 2024 | Xiaohong504 physical qubitsWikipediaSource — Xiaohong |
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.
Not on record for CAS yet: two-qubit fidelity, a published roadmap, a live fleet API, metriq-gym benchmarks, funding rounds, recent headlines.
Quantum · Timeline
CAS, in order
Everything the site tracks for CAS — hardware, records, advantage claims it took part in, funding and its own roadmap — newest first.
Newest on the timeline
20241 event
That is the whole timeline: 1 event.
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.