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COMPANY RESEARCH · Error control

Riverlane

Builds the classical processing that interprets repeated quantum error-check measurements. Deltaflow connects decoding hardware to a quantum control system; Deltakit supplies software for designing, simulating and analyzing QEC experiments.

Official website ↗
United Kingdom / United States · Research reviewed 23 Sept 2026

Since the previous record: 1 evidence source added · axis ratings unchanged.

Review what changed →

Review history 3 records

Record dates use UTC and show when an assessment or clarification was saved. Review dates show the evidence check. Earlier records were recovered from QubitWire’s source history; no earlier score movement is inferred.

  1. 1 evidence source added · axis ratings unchanged

    Assessment reviewed 6 Sept 2026 · Research reviewed 23 Sept 2026

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    What changed
    What the research demonstrates
    Previously

    A June 2026 journal paper reports an eight-qubit experiment on Rigetti Ankaa-2, with up to 25 decoding rounds. A separate fast-feedback measurement achieved a 9.6-microsecond response for nine measurement rounds.

    Now

    A June 2026 journal paper reports an eight-qubit experiment on Rigetti Ankaa-2, with up to 25 decoding rounds. A separate fast-feedback measurement achieved a 9.6-microsecond response for nine measurement rounds. A September 2026 Qblox/Riverlane integration exercises a real control-and-decoding loop with emulated measurement data. It is an integration test, not a live-qubit error-correction demonstration.

    Sources added (1)
    Sources retained (1)
    Sources in this record (5)

  2. 1 evidence source added · axis ratings unchanged

    Assessment reviewed 6 Sept 2026 · Research reviewed 7 Sept 2026

    Open this evidence record →

    What changed
    Research brief
    Previously

    None recorded

    Now

    Initial technology, access and evidence brief

    Evidence sources
    Sources added (1)
    Sources in this record (4)
Identity & attribution
Organization record
Riverlane (organization-053)
Recorded role
Real-time quantum error correction and decoding
Recorded aliases
No aliases recorded in this assessment.
Name and period
No dated name or ownership transition is recorded here. An alias is a search aid, not evidence of a legal ownership relationship.
Product scope
Quantum error correction: real-time classical decoding and QEC development tools

A company profile may discuss several systems. Capabilities remain attached to the product and conditions named in each source; they do not transfer automatically to related organizations. A verified security relationship has not been attached to this record.

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Evidence updates

New evidence to consider

These source updates add context. QRank scores retain their existing assessment dates.

Riverlane · Planned headquarters and provider demonstration

Riverlane announced plans for a Maryland U.S. headquarters and collaboration with the University of Maryland. Its earlier APS recap describes real-time error-correction demonstrations with control-system partners.

Source checked
Limits, research question & sources

The headquarters remains a plan. The demonstration is provider-reported evidence, rather than an independent review of a complete fault-tolerant computer.

Question to follow: What is the demonstrated end-to-end role of the decoder and control interface?

Company evidence and analysis

Dated company evidence, its limits and the next test to follow. These notes do not change a QRank score.

RiverlaneReal-time quantum error-correction decoding

Sources reviewed 20 Oct 2026. Event dates remain attached to the original evidence.

Riverlane’s April 2026 performance note reports a mean latency of 16.32 microseconds using replayed experimental data and a QPU/control emulator. This is a decoder-system experiment, with an explicit boundary separating it from operation on a connected live quantum processor.

That boundary makes the result more useful, because it tells readers exactly which uncertainty remains. Recorded syndromes can test whether a decoder keeps pace with an incoming stream; they cannot reproduce every consequence of a physical machine responding to the decoder. The average is only one part of the story. A small number of late decisions can matter if an algorithm must wait for them, so a mature comparison should include a latency distribution and the conditions that create its slow tail. Equally, a faster answer has limited value if its error estimate becomes worse. The strongest next evidence would show decoding quality, throughput and response timing together, with a reproducible input set. Riverlane’s card should track those coupled properties and identify the transition from a controlled replay to sustained physical feedback as its next milestone.

For a reader evaluating Riverlane, the practical question is whether demonstrated decoding speed survives connection to a continuously operating experiment. A useful next evidence check is specific: request a live syndrome stream with cycle timestamps, decoder backlog and the fraction of deadlines missed. A replay or emulator result can understate the interruptions, wiring delays and burst errors of a live control loop. These are proposed tests for judging a later update, not claims that the company has already passed them.

Security status: No public security verified in reviewed material; directory/watch profile only

Facts, comparisons and next evidence

At a glance

  • label
    Quantum role
    value
    Error-correction decoding
  • label
    Evidence date
    value
    2026-04-09
  • label
    Assessment action
    value
    Evidence enrichment

Dated milestones

  • date
    2026-04-09
    Date scope
    source publication date; unknown if undated
    event
    Real-time decoder evidence released
    status
    Published primary evidence; retain the narrower maturity statement
    what it does not establish
    A replay or emulator result can understate the interruptions, wiring delays and burst errors of a live control loop.

Quantum role

layer
Error-correction decoding
Question
Whether demonstrated decoding speed survives connection to a continuously operating experiment.

Questions for comparison

  • Latency distribution, not just mean
  • Logical decoding quality at stated noise
  • Live versus replayed syndrome stream

Related approaches

  • name
    Qblox
    relationship
    Proposed comparison of relevant dimensions; not a claim of equivalent products or a ranking
    dimensions
    • Latency distribution, not just mean
    • Logical decoding quality at stated noise
    • Live versus replayed syndrome stream
  • name
    SEEQC
    relationship
    Proposed comparison of relevant dimensions; not a claim of equivalent products or a ranking
    dimensions
    • Latency distribution, not just mean
    • Logical decoding quality at stated noise
    • Live versus replayed syndrome stream

Limits and missing evidence

  • A replay or emulator result can understate the interruptions, wiring delays and burst errors of a live control loop.
  • Sustained live-QPU feedback evidence
  • Tail latency and buffer occupancy
  • Matched decoding-accuracy benchmark

What would change this assessment

trigger
Request a live syndrome stream with cycle timestamps, decoder backlog and the fraction of deadlines missed.
Evidence needed
Dated primary technical report, product specification or customer/issuer disclosure directly answering the test.
Test
Identify the configuration, time boundary and measured outcome; retain unsuccessful attempts and stated limitations.
Limit
A replay or emulator result can understate the interruptions, wiring delays and burst errors of a live control loop.

A starting question

question
Why does “real time” need a start and an end?
answer
A timing number can cover only decoding, or it can include measurement transfer and the next control action. Both can be valid measurements, but they answer different questions. The boundaries must be stated before comparing them.
Original sources and scope
  1. Riverlane real-time QEC system performance ↗Source dated 9 Apr 2026

    Reported latency uses replayed experimental data and a QPU/control emulator; not a live QPU. The source itself cautions against like-for-like comparison with Google.

SOURCE REVIEW

Decoder recalibration is a classical support task

Riverlane offers Deltakit software and Deltaflow real-time error-correction systems. Its 14 October 2026 technical update explores GPU acceleration of decoder-weight recalibration between experiments as hardware noise drifts.

What this establishes—and its limits

Faster recalibration is a specific classical processing improvement. It is distinct from real-time decoding during a quantum experiment and from a full fault-tolerant computation.

Evidence to look for next

Check the noise data, code, decoder, GPU and training cost before generalizing a recalibration result.

Sources reviewed . This review does not create or change a QRank assessment.

  1. Riverlane: error-correction products Company website · Publication date not stated

    Deltakit and Deltaflow roles.

  2. Riverlane: decoder recalibration Company technical account · Source published

    GPU acceleration between experiments.

Current official website Understand the technology
TECHNOLOGY & ACCESS

What it does. Where it fits.

Quantum error correction: real-time classical decoding and QEC development tools

Who should look closer

QEC learners, quantum hardware teams and researchers studying code, decoder and latency trade-offs.

QubitWire’s editorial assessment of practical fit.

Start with open-source Deltakit

Deltakit can simulate QEC without a quantum processor and links a practical textbook. Real-time hardware decoding uses a Deltaflow integration; some Deltakit capabilities are cloud services.

Check the current access route ↗
DOCUMENTED EVIDENCE

What the sources establish

A June 2026 journal paper reports an eight-qubit experiment on Rigetti Ankaa-2, with up to 25 decoding rounds. A separate fast-feedback measurement achieved a 9.6-microsecond response for nine measurement rounds. A September 2026 Qblox/Riverlane integration exercises a real control-and-decoding loop with emulated measurement data. It is an integration test, not a live-qubit error-correction demonstration.

Nature portfolio study ↗qblox.com ↗

What remains unresolved

This is a scoped decoding and feedback demonstration. It does not establish a universal fault-tolerant computer or sustained utility-scale operation; hardware and code quality remain essential.

The next question to watch

Can low-latency decoding remain accurate and avoid processing backlogs as larger codes and fault-tolerant logical operations run continuously?

A research question, not a promised milestone.

QubitWire coverage

Business + Policy · Published · Source report · Sources checked

Quantum’s Error Problem Is Getting a New Address.

Riverlane’s planned Maryland headquarters puts error correction, university collaboration and the people building the stack in one story.

Open research questions

Editorial questions for this profile. No reviewed closure decision has been recorded; unanswered questions do not lower the official score.

Open research question

Can low-latency decoding remain accurate and avoid processing backlogs as larger codes and fault-tolerant logical operations run continuously?

What evidence would help

A source addressing this question must identify the named system, experiment or deployment, its conditions, measured outcome and remaining limitations. What are the physical-qubit, runtime and sampling overheads?

What would resolve it?

An editorial review must explain which part of this question the evidence resolves. A roadmap or an announcement alone does not close it.

No resolved, partial or disputed outcome is asserted without a reviewed transition and its evidence.

Suggest evidence
Open research question

Which named system or service can I use under the documented access route?

What evidence would help

Check the current terms for start with open-source deltakit. Identify the system version, eligibility, restrictions and whether the result used hardware or simulation.

What would resolve it?

Current primary documentation must identify the offering, eligible user and access conditions. An unspecified company-level access claim is insufficient.

No resolved, partial or disputed outcome is asserted without a reviewed transition and its evidence.

Suggest evidence
Open research question

Was error suppression measured on hardware or predicted by simulation?

What evidence would help

Provide the source location, relevant product or generation, workload, resource constraints and reported uncertainty. Keep measurements, simulations and announced targets distinct.

What would resolve it?

A source reviewer must map the evidence to this exact scope. Missing disclosure remains unknown; it is not technical failure.

No resolved, partial or disputed outcome is asserted without a reviewed transition and its evidence.

Suggest evidence

Questions are drawn from the existing brief and sector reading guide. Research brief reviewed 23 Sept 2026. Following stores a local bookmark; it does not send email alerts or imply a scheduled review.

Since your review

Scope: Riverlane. Reading a page never marks its records reviewed.

Keep a baseline and explicitly mark the evidence you have reviewed. This optional journal stays in this browser.

Existing material records remain available after setup. Routine rechecks and initial entries are excluded from material counts.

Public 7-day, 30-day & full history →

From claim to assessment

These are the existing assessment claims and their recorded criterion links. A source link is not an independent replication. New research does not change these published ratings automatically.

Source references in method 1.0 · assessment reviewed 6 Sept 2026
Recorded claim & sourceAssessment linkageProvenance & limits
Source 1

Reports integrated FPGA decoding on Rigetti Ankaa-2: eight-qubit stability experiments, up to 25 decoding rounds, sub-microsecond mean per-round decoding, and 9.6 microseconds response for nine measurement rounds.

Demonstrating real-time and low-latency quantum error correction with superconducting qubits ↗Published 1 Jun 2026
Exact source location

No page, figure or section locator is recorded. Open the source and check the claim in its original context.

Capability

A peer-reviewed eight-qubit stability experiment measures real-time decoding and feedback with declared latency.

Use in practice

A named Rigetti hardware integration demonstrates external research use; utility-scale operation is not established.

Integration

Hardware integration and a QSC workshop document concrete technical collaboration.

Published rating inputs remain unchanged.		Organization-originated source

Source type: paper. Independent replication, experiment date and source-version fingerprint are not separately recorded.

Product and measurement scope: read the named system and conditions in this claim. No normalized product revision is assigned.

Review recorded 6 Sept 2026. Research brief reviewed 23 Sept 2026. These dates do not establish publication or experiment dates.

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Source 2

Documents Deltaflow 2 as an FPGA-based QEC system combining a hardware decoder, data routing and real-time processing connected to the control stack.

Deltaflow — Real-time QEC system ↗Published Not recorded
Exact source location

No page, figure or section locator is recorded. Open the source and check the claim in its original context.

Delivery

Deltaflow is a documented hardware offering with a technical product description.

Published rating inputs remain unchanged.		Organization-originated source

Source type: technical. Independent replication, experiment date and source-version fingerprint are not separately recorded.

Product and measurement scope: read the named system and conditions in this claim. No normalized product revision is assigned.

Review recorded 6 Sept 2026. Research brief reviewed 23 Sept 2026. These dates do not establish publication or experiment dates.

Report an issue with this claim →
Source 3

ORNL's Quantum Science Center confirms a February workshop using Riverlane and IQM tools on real qubits, with participants completing surface-code experiments.

Quantum Science Center hosts first quantum error correction workshop ↗Published 16 Feb 2026
Exact source location

No page, figure or section locator is recorded. Open the source and check the claim in its original context.

Integration

Hardware integration and a QSC workshop document concrete technical collaboration.

Published rating inputs remain unchanged.		External source; collaborators may be involved

Source type: customer. Independent replication, experiment date and source-version fingerprint are not separately recorded.

Product and measurement scope: read the named system and conditions in this claim. No normalized product revision is assigned.

Review recorded 6 Sept 2026. Research brief reviewed 23 Sept 2026. These dates do not establish publication or experiment dates.

Report an issue with this claim →
Revision and evidence-family boundaries

Record reference: 6586535acfecd18fa5f8d49a88a7c980771fe9f0eef47811bfcb56f99d28ff42. Read prior recorded revisions.

Repeated coverage can describe the same experiment. The assessment does not contain a reviewed claim-family grouping, so the number of links is never shown as a replication count. Source pages can change independently of this saved assessment; the original source text is not archived here.

CHECK THE ORIGINALS

Sources & evidence

  1. Demonstrating real-time and low-latency quantum error correction with superconducting qubits ↗Organization-originated source · 1 Jun 2026

    Reports integrated FPGA decoding on Rigetti Ankaa-2: eight-qubit stability experiments, up to 25 decoding rounds, sub-microsecond mean per-round decoding, and 9.6 microseconds response for nine measurement rounds.

  2. Deltaflow — Real-time QEC system ↗Organization-originated source · Publication date not stated

    Documents Deltaflow 2 as an FPGA-based QEC system combining a hardware decoder, data routing and real-time processing connected to the control stack.

  3. Quantum Science Center hosts first quantum error correction workshop ↗External source (may be a collaborator) · 16 Feb 2026

    ORNL's Quantum Science Center confirms a February workshop using Riverlane and IQM tools on real qubits, with participants completing surface-code experiments.

  4. Deltakit — Open-source QEC software ↗technical · Publication date not stated

    Documents simulation without a QPU, circuit generation and analysis, links a textbook, and distinguishes open-source features from cloud services and Deltaflow real-time operation.

  5. Qblox and Riverlane real-time decoding integration ↗Joint technical announcement · 11 Sept 2026

    Cluster and Deltaflow 2 close a physical control/decoding loop using emulated measurement data, not live qubits.

  6. Riverlane real-time QEC system performance ↗Company primary announcement · 9 Apr 2026

    Riverlane’s April 2026 performance note reports a mean latency of 16.32 microseconds using replayed experimental data and a QPU/control emulator. This is a decoder-system experiment, with an explicit boundary separating it from operation on a connected live quantum processor.

  7. Riverlane establishes U.S. headquarters in Maryland ↗Primary source · 17 Sept 2026

    Riverlane announced plans for a Maryland U.S. headquarters and collaboration with the University of Maryland. Its earlier APS recap describes real-time error-correction demonstrations with control-system partners.

  8. Riverlane APS 2026 real-time QEC demonstration ↗Primary source · 1 Apr 2026

    Riverlane announced plans for a Maryland U.S. headquarters and collaboration with the University of Maryland. Its earlier APS recap describes real-time error-correction demonstrations with control-system partners.

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