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description= The largest demonstrated error-corrected qubit count is 96, held by QuEra Computing since January 2026.;
author= Quantum Zeitgeist;
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in quantum stack full technology stack overview quantum error correction qec codes fault tolerance roadmap photonic architectures cv dv mbqc and t centre explainer timeline key events by year 2019 to 2026 research consortia programmes global quantum consortia alliances periodic table companies as elements track all trackers qubit records fidelity programmes funding trackers hub all trackers every live number on one page qubits physical qubit record 2 310 qubits matriq logical qubit record 96 logical qubits quera computing logical qubit tracker verified claims and the rule that decides gate fidelity milestones 99 99 best two qubit gate qubit evidence the source behind every figure encoding overhead physical qubits per logical qubit programmes darpa qbi 11 companies in stage b chips act awards 5 of 9 final awards signed roadmaps what each company promised by year fault tolerant roadmap the steps to a useful corrected machine money investment tracker 113 funding deals capital markets 87 listed companies quantum stocks live prices and quotes acquisitions m a and spac deals industry patent tracker quantum ip by company with the newest filings government labs what each country s public labs publish state of quantum the dated industry monitor map about about about entangled future the dataset the largest quantum database on the planet free how to cite citation formats dated to the data methodology how records are found and checked claim your profile update your company listing accessibility accessibility statement security start here quantum safe cryptography what breaks what replaces it and when harvest now decrypt later why encrypted data is already at risk migration roadmap moving an estate to post quantum crypto nist standards ml kem ml dsa and slh dsa qkd vs pqc two answers to the same threat companies post quantum cryptography 182 companies building pqc pqc algorithms the standardised algorithms compared quantum key distribution 137 companies building qkd random number generation 41 companies building qrng search k subscribe search companies and pages esc type to search to move enter to open explore trackers dashboard api sensors security learn compare jobs news events guides glossary countries directory all companies new startups software companies consultancies usa companies uk companies china quantum all countries world map research labs universities enterprise adopters sectors quantum hubs government programs consortia hardware hardware overview qpu manufacturers control systems cryogenics cloud services components cloud providers photonic quantum sensors sensing overview magnetometers gravimeters atomic clocks navigation quantum imaging investment capital markets investment tracker quantum stocks leaderboard top funded companies top investors vcs investors incubators acquisitions funding flow dashboard industry insights industry stats stack ecosystem map market map partnership network network graph quantum stack quantum error correction photonic architectures timeline consortia programmes periodic table all trackers trackers all trackers physical qubit record logical qubit record logical qubit tracker gate fidelity milestones qubit evidence encoding overhead darpa qbi chips act awards roadmaps fault tolerant roadmap investment tracker capital markets quantum stocks acquisitions patent tracker government labs state of quantum map about about the dataset how to cite methodology claim your profile accessibility learn learn articles quantum concepts quantum glossary quantum dictionary use cases guides security quantum safe cryptography harvest now decrypt later migration roadmap nist standards qkd vs pqc post quantum cryptography pqc algorithms quantum key distribution random number generation compare jobs news latest news newsroom events conferences subscribe to newsletter quantum stack logical qubit record the largest number of error corrected qubits anyone has demonstrated how it got there and who has said they will beat it 96 current record 243 days standing 5 organisations with any 2027 next target year home stack logical qubit record verified logical qubit record 96 error corrected logical qubits quera computing 448 physical qubits neutral atom 16 6 4 high rate code set january 2026 standing for over 243 days evidence peer reviewed paper share how the record moved what it means how far from useful the whole field who is chasing it what does not count questions how the record moved every dated logical qubit demonstration this database holds the line is the record it holds flat until someone beats it then steps hollow points are demonstrations that did not take the record either because the record was already higher or because the result is not error corrected computation logical qubit record over time a stepped line rising from 4 logical qubits in june 2023 to 96 in january 2026 every figure is listed in the table below the chart 0 25 50 75 100 2024 2025 2026 logical qubits nord quantique 1 logical qubits april 2024 quantinuum 12 logical qubits september 2024 atom computing 24 logical qubits november 2024 google quantum ai 1 logical qubits december 2024 quantinuum 50 logical qubits december 2024 did not take the record 50 set aside quantinuum 48 logical qubits november 2025 today quantinuum 4 logical qubits june 2023 4 quantinuum quera computing 48 logical qubits december 2023 48 quera quera computing 96 logical qubits january 2026 96 quera the record other demonstrations every dated logical qubit demonstration with the source for each date lq who took the record source june 2023 4 quantinuum yes link december 2023 48 quera computing yes link april 2024 1 nord quantique no the record was already higher link september 2024 12 quantinuum no the record was already higher link november 2024 24 atom computing no the record was already higher link december 2024 1 google quantum ai no the record was already higher link december 2024 50 quantinuum no fifty logical qubits entangled in a single state at entangled state fidelities of 98 09 to 99 0 percent a count of qubits held in one entangled state is not error corrected computation which is the same basis on which the 94 qubit ghz figure from helios is set aside link november 2025 48 quantinuum no the record was already higher link january 2026 96 quera computing yes link this is the record as this database holds it built from dated results that carry a source not a claim to be the complete history of the field what the number means a physical qubit is a piece of hardware and it makes mistakes a logical qubit is many physical qubits wired together so their errors can be spotted and fixed while the computation carries on that is the whole game nobody runs a useful algorithm on raw hardware so the number that matters is how many corrected qubits a machine can hold at once today s record costs 4 7 physical qubits for every logical one the best ratio any stabilizer code has demonstrated only demonstrated results appear here a roadmap slide promising 100 logical qubits in 2028 is a plan and plans live further down this page under their own heading a code that spots errors and discards the failed runs does not count either because discarding runs is not correcting them how far 96 is from useful each bar is the lower bound of a published resource estimate with today s record measured against it lower bounds flatter the record and even so most of these bars are close to empty the estimates and their caveats are on the encoding overhead page portfolio optimisation 50 to 200 lq the record is past the 50 lq lower bound often named as an early fault tolerant target whether it would beat a classical solver is still an open research question drug discovery near term 100 to 1 000 lq the record is 96 of the lower bound smaller molecules and approximate methods and only with high circuit fidelity fault tolerant chemistry 1 000 to 10 000 lq the record is 10 of the lower bound full active space simulation of a drug relevant molecule such as femo co nitrogenase breaking rsa 2048 about 4 000 lq the record is 2 of the lower bound the canonical estimate for a practical shor implementation before the magic state factories that dominate the real cost everyone who has demonstrated one 5 organisations in this database have demonstrated an error corrected logical qubit that is the entire field the overhead column is what each logical qubit cost in hardware and it varies by a factor of a hundred organisation lq behind by overhead code set source quera computing 96 4 7 1 16 6 4 high rate january 2026 link quantinuum 48 48 2 0 1 iceberg concatenated november 2025 link atom computing 24 72 50 1 bacon shor november 2024 link google quantum ai 1 95 105 1 surface code december 2024 link nord quantique 1 95 1 0 1 gkp bosonic april 2024 link who is chasing it earliest announced attempt 2027 1 year away 3 companies have published a target above 96 for that year oxford ionics quera computing ionq every published roadmap target above 96 logical qubits these are stated intentions not results and the years are the earliest anyone claims rather than forecasts 2027 1 year away 100 lq oxford ionics 10 000 pq 99 99999 logical accuracy 100 lq quera computing 100 logical qubits 10 000 physical qubits target 800 lq ionq 10 000 qubit system oxford ionics 2d chip fabric 50x density vs 1d aq metrics superseded by physical qubit roadmap 2028 2 years away 100 lq atom computing gen 3 10 000 physical qubits 100 error corrected logical qubits 10x per generation scaling model 100 lq infleqtion 100 logical qubits utility scale quantum computing 0m illinois investment 100 lq quera computing 100 logical qubits small instances of shor algorithm and cryptographically relevant algorithms feasible continuous fault tolerant operation crqc adjacent capability 100 lq seeqc 1 600 lq ionq cryptographically relevant qc 2029 3 years away 100 lq nord quantique utility scale 100 logical qubits 100 lq pasqal lyra roadmap target of 100 high fidelity logical qubits 200 lq ibm quantum starling 200 logical qubits 100m quantum operations 100 kookaburra modules first large scale ftqc deployment full magic state factory operational 500 lq xanadu fault tolerant photonic quantum computing data centre about 1m photonic qubits and 500 logical qubits the date was brought forward by the disco corp partnership and is backed by project optimism cad 390m with ontario of which the cad 195m federal portion was committed on 28 aug 2026 1 000 lq google quantum ai useful error corrected quantum computer 1m physical qubits 1 000 logical qubits target 10 6 logical error rate 100m quantum operations 8 000 lq ionq 200k physical qubits 8 000 logical qubits fault tolerant era begins 2030 4 years away 100 lq alice bob graphene about 1 500 physical via elevator codes industrial advantage 100 lq iqm hundreds of logical qubits 10 7 error 100 lq qpiai unnati 100 logical qubits using q ldpc codes q4 2030 target 200 lq pasqal roadmap target of 200 logical qubits 200 lq quantinuum apollo 5th gen hundreds of logical qubits 10k 1m gates universal fault tolerant quantum computing 1 000 lq infleqtion 1 000 logical qubits new architecture announced 2025 fault tolerant operations 1 000 lq quera computing 100 000 physical qubits 1 000 logical qubits large scale fault tolerant operation 80 000 lq ionq 2m physical qubits 80 000 logical qubits target logical gate accuracy 99 9999999999 10 nines 1e 12 error rate 2031 5 years away 1 000 lq xanadu target of more than 1 000 logical qubits by 2031 stated 31 aug 2026 depends on cutting photon loss to the error correction threshold 2033 7 years away 2 000 lq ibm quantum blue jay 2 000 logical qubits 1b quantum operations 2034 8 years away 50 000 lq oxford quantum circuits roadmap target claims that are not counted all of these are real results announced by serious teams none of them is error corrected computation so none appears in the table above infleqtion 12 logical qubits the 4 2 2 code is distance 2 it detects errors and throws away the runs that fail which is post selection rather than correction real progress but not an error corrected logical qubit xanadu aurora foliated distance 2 repetition code no verified logical qubits the nature paper s41586 024 08406 9 reports 12 physical qubit modes per clock cycle and a foliated distance 2 repetition code distance 2 detects errors rather than correcting them the same basis on which the infleqtion 4 2 2 claim is rejected xanadu itself calls aurora a 12 qubit machine and treats fault tolerance as future work quantinuum 50 logical qubits december 2024 fifty logical qubits entangled in a single state at entangled state fidelities of 98 09 to 99 0 percent a count of qubits held in one entangled state is not error corrected computation which is the same basis on which the 94 qubit ghz figure from helios is set aside questions people ask about this number what is the logical qubit record right now 96 error corrected logical qubits held by quera computing since january 2026 the demonstration ran on 448 physical qubits using a 16 6 4 high rate code an overhead of 4 7 physical qubits for every logical one why is quantinuum listed at 48 when it announced 94 the helios announcement gives three different figures 48 fully error corrected logical qubits 94 logical qubits held in a ghz entangled state and 50 error detected only the first is error corrected computation holding qubits in a single entangled state and detecting errors without correcting them are different and easier achievements why does the infleqtion 12 logical qubit claim not count it uses the 4 2 2 code which has distance 2 a distance 2 code can spot that an error happened but cannot work out which qubit it hit so the run is thrown away rather than repaired discarding failed runs is post selection not correction and a computation that has to be discarded whenever it goes wrong cannot be run for long how many logical qubits would it take to break rsa 2048 around 4 000 for the algorithm register on this site s published estimate the real cost is higher because the magic state factories that supply the t gates dominate which is why full resource estimates put the physical qubit cost in the millions when is the record likely to be broken the earliest published target above 96 is 2027 claimed by 3 companies those are stated intentions rather than forecasts and quantum roadmap dates slip more often than they hold know someone arguing about qubit counts send them the number share advertisement keep going where this number comes from the record is one row of a larger tracker every figure behind it carries a source you can open logical qubit tracker leaderboards codes and ratios physical qubit record the raw hardware count qubit evidence every claim with its source quantum intelligence weekly market moves qubit milestones and funding rounds every monday email address subscribe by subscribing you agree to 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