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Quantum scorecard

RIKEN

Superconducting

RIKEN's newest device on record is RIKEN, 53 physical qubits, announced Mar 2023.

Latest activity on record: Oct 17, 2026

Published figures

Each figure names its device and links to where it was published.

Newest device on record
53physical qubitsRIKEN · Mar 2023 · Wikipedia
Largest device to date
53physical qubitsRIKEN · Mar 2023

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.

020406020232024announcement datephysical qubitsRIKEN · Mar 2023 · 53 physical qubitsRIKEN · 53

Every milestone on record

1 entry, newest first.

DateDevice
Mar 2023RIKEN53 physical qubitsWikipediaSource — RIKEN

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.

Recent headlines

Not on record for RIKEN yet: two-qubit fidelity, a published roadmap, a live fleet API, metriq-gym benchmarks, funding rounds.

Quantum · Timeline

RIKEN, in order

Everything the site tracks for RIKEN — hardware, records, advantage claims it took part in, funding and its own roadmap — newest first.

Newest on the timeline

All 16Hardware 1Advantage claims 15
Lanes and years

Jump to year

202612 events

  1. Advantage claim · Variational

    [N_2] (14e, 28o) 3.0A HCI

    -108.9615energy in Hartree (lower is better)

    Instance n2_3-00_14e_28o · Qunova Computing, RIKEN

    Quantum Advantage Tracker

  2. Advantage claim · Variational

    [2Fe-2S] (30e, 20o) HCI

    -116.6054energy in Hartree (lower is better)

    Instance 2fe_2s_30e_20o · Qunova Computing, RIKEN

    Quantum Advantage Tracker

  3. Advantage claim · Observable estimation

    QESEM (unbiased), ibm_boston, ZZd3, 51qx16c

    0.2111estimated observable, against this instance's reference

    Instance floquet_mixed_field_ising_zzd3_51qx16c · Qedma, IBM, Riken, BlueQubit

    Quantum Advantage Tracker

  4. Advantage claim · Observable estimation

    SPP, ORQA (eps0=5e-8, W=16), ZZd3, 51qx16c

    0.1834estimated observable, against this instance's reference

    Instance floquet_mixed_field_ising_zzd3_51qx16c · Qedma, IBM, Riken, BlueQubit

    Quantum Advantage Tracker

  5. Advantage claim · Variational

    ASCI solution of guided_sparse_ground_state_problem_49Q_v1

    -85.5566energy in Hartree (lower is better)

    Instance guided_sparse_ground_state_problem_49Q_v1 · IBM, RIKEN, University of Chicago

    Quantum Advantage Tracker

  6. Advantage claim · Variational

    HCI solution of guided_sparse_ground_state_problem_49Q_v1

    -85.5766energy in Hartree (lower is better)

    Instance guided_sparse_ground_state_problem_49Q_v1 · IBM, RIKEN, University of Chicago

    Quantum Advantage Tracker

  7. Advantage claim · Variational

    CIPSI solution of guided_sparse_ground_state_problem_49Q_v1

    -85.5766energy in Hartree (lower is better)

    Instance guided_sparse_ground_state_problem_49Q_v1 · IBM, RIKEN, University of Chicago

    Quantum Advantage Tracker

  8. Advantage claim · Variational

    DMRG solution of guided_sparse_ground_state_problem_49Q_v1

    -85.5866energy in Hartree (lower is better)

    Instance guided_sparse_ground_state_problem_49Q_v1 · IBM, RIKEN, University of Chicago

    Quantum Advantage Tracker

  9. Advantage claim · Variational

    TAM_for_guided_sparse_ground_state_problem_49Q_v1

    -85.5866energy in Hartree (lower is better)

    Instance guided_sparse_ground_state_problem_49Q_v1 · IBM, RIKEN, University of Chicago

    Quantum Advantage Tracker

  10. Advantage claim · Variational

    SKQD_for_guided_sparse_ground_state_problem_49Q_v1

    -85.5866energy in Hartree (lower is better)

    Instance guided_sparse_ground_state_problem_49Q_v1 · IBM, RIKEN, University of Chicago

    Quantum Advantage Tracker

  11. Advantage claim · Variational

    [N_2] (14e, 28o) 3.0A HI-VQE

    -108.9612energy in Hartree (lower is better)

    Instance n2_3-00_14e_28o · Qunova Computing, RIKEN

    Quantum Advantage Tracker

  12. Advantage claim · Variational

    [2Fe-2S] (30e, 20o) HI-VQE

    -116.6047energy in Hartree (lower is better)

    Instance 2fe_2s_30e_20o · Qunova Computing, RIKEN

    Quantum Advantage Tracker

20253 events

  1. Advantage claim · Variational

    [4Fe-4S] (54e, 36o) CISD

    -326.7421energy in Hartree (lower is better)

    Instance 4fe_4s_54e_36o · IBM, RIKEN

    Quantum Advantage Tracker

  2. Advantage claim · Variational

    [4Fe-4S] (54e, 36o) RHF

    -326.5474energy in Hartree (lower is better)

    Instance 4fe_4s_54e_36o · IBM, RIKEN

    Quantum Advantage Tracker

  3. Advantage claim · Variational

    SQD [4Fe-4S] (54e, 36o)

    -326.913energy in Hartree (lower is better)

    Instance 4fe_4s_54e_36o · IBM, RIKEN

    Quantum Advantage Tracker

20231 event

That is the whole timeline: 16 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.

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