3.26.1 html 258 332 1 true 85 0 false 7 false false R1.htm 0000001 - Document - Cover Sheet http://www.quantinuum.com/role/Cover Cover Cover 1 false false R2.htm 9952151 - Statement - Unaudited Condensed Consolidated Balance Sheets Sheet http://www.quantinuum.com/role/UnauditedCondensedConsolidatedBalanceSheets Unaudited Condensed Consolidated Balance Sheets Statements 2 false false R3.htm 9952152 - Statement - Unaudited Condensed Consolidated Balance Sheets (Parenthetical) Sheet http://www.quantinuum.com/role/UnauditedCondensedConsolidatedBalanceSheetsParenthetical Unaudited Condensed Consolidated Balance Sheets (Parenthetical) Statements 3 false false R4.htm 9952153 - Statement - Unaudited Condensed Consolidated Statements of Operations Sheet http://www.quantinuum.com/role/UnauditedCondensedConsolidatedStatementsofOperations Unaudited Condensed Consolidated Statements of Operations Statements 4 false false R5.htm 9952154 - Statement - Unaudited Condensed Consolidated Statements of Comprehensive Loss Sheet http://www.quantinuum.com/role/UnauditedCondensedConsolidatedStatementsofComprehensiveLoss Unaudited Condensed Consolidated Statements of Comprehensive Loss Statements 5 false false R6.htm 9952155 - Statement - Unaudited Condensed Consolidated Statements of Comprehensive Loss (Parenthetical) Sheet http://www.quantinuum.com/role/UnauditedCondensedConsolidatedStatementsofComprehensiveLossParenthetical Unaudited Condensed Consolidated Statements of Comprehensive Loss (Parenthetical) Statements 6 false false R7.htm 9952156 - Statement - Unaudited Condensed Consolidated Statements of Cash Flows Sheet http://www.quantinuum.com/role/UnauditedCondensedConsolidatedStatementsofCashFlows Unaudited Condensed Consolidated Statements of Cash Flows Statements 7 false false R8.htm 9952157 - Statement - Unaudited Condensed Consolidated Statements of Temporary Equity and Shareholders' Equity Sheet http://www.quantinuum.com/role/UnauditedCondensedConsolidatedStatementsofTemporaryEquityandShareholdersEquity Unaudited Condensed Consolidated Statements of Temporary Equity and Shareholders' Equity Statements 8 false false R9.htm 9952158 - Disclosure - DESCRIPTION OF ORGANIZATION Sheet http://www.quantinuum.com/role/DESCRIPTIONOFORGANIZATION DESCRIPTION OF ORGANIZATION Notes 9 false false R10.htm 9952159 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Sheet http://www.quantinuum.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Notes 10 false false R11.htm 9952160 - Disclosure - OTHER CURRENT ASSETS Sheet http://www.quantinuum.com/role/OTHERCURRENTASSETS OTHER CURRENT ASSETS Notes 11 false false R12.htm 9952161 - Disclosure - PROPERTY AND EQUIPMENT — NET Sheet http://www.quantinuum.com/role/PROPERTYANDEQUIPMENTNET PROPERTY AND EQUIPMENT — NET Notes 12 false false R13.htm 9952162 - Disclosure - OTHER INTANGIBLE ASSET—NET Sheet http://www.quantinuum.com/role/OTHERINTANGIBLEASSETNET OTHER INTANGIBLE ASSET—NET Notes 13 false false R14.htm 9952163 - Disclosure - ACCRUED LIABILITIES Sheet http://www.quantinuum.com/role/ACCRUEDLIABILITIES ACCRUED LIABILITIES Notes 14 false false R15.htm 9952164 - Disclosure - FAIR VALUE Sheet http://www.quantinuum.com/role/FAIRVALUE FAIR VALUE Notes 15 false false R16.htm 9952165 - Disclosure - LEASES Sheet http://www.quantinuum.com/role/LEASES LEASES Notes 16 false false R17.htm 9952166 - Disclosure - COMMITMENTS AND CONTINGENCIES Sheet http://www.quantinuum.com/role/COMMITMENTSANDCONTINGENCIES COMMITMENTS AND CONTINGENCIES Notes 17 false false R18.htm 9952167 - Disclosure - STOCKHOLDERS' EQUITY Sheet http://www.quantinuum.com/role/STOCKHOLDERSEQUITY STOCKHOLDERS' EQUITY Notes 18 false false R19.htm 9952168 - Disclosure - NON-CONTROLLING INTERESTS Sheet http://www.quantinuum.com/role/NONCONTROLLINGINTERESTS NON-CONTROLLING INTERESTS Notes 19 false false R20.htm 9952169 - Disclosure - REVENUE RECOGNITION AND CONTRACTS WITH CUSTOMERS Sheet http://www.quantinuum.com/role/REVENUERECOGNITIONANDCONTRACTSWITHCUSTOMERS REVENUE RECOGNITION AND CONTRACTS WITH CUSTOMERS Notes 20 false false R21.htm 9952170 - Disclosure - INCOME TAXES Sheet http://www.quantinuum.com/role/INCOMETAXES INCOME TAXES Notes 21 false false R22.htm 9952171 - Disclosure - NET EARNINGS PER SHARE Sheet http://www.quantinuum.com/role/NETEARNINGSPERSHARE NET EARNINGS PER SHARE Notes 22 false false R23.htm 9952172 - Disclosure - STOCK-BASED COMPENSATION Sheet http://www.quantinuum.com/role/STOCKBASEDCOMPENSATION STOCK-BASED COMPENSATION Notes 23 false false R24.htm 9952173 - Disclosure - SEGMENTS Sheet http://www.quantinuum.com/role/SEGMENTS SEGMENTS Notes 24 false false R25.htm 9952174 - Disclosure - RELATED PARTY TRANSACTIONS Sheet http://www.quantinuum.com/role/RELATEDPARTYTRANSACTIONS RELATED PARTY TRANSACTIONS Notes 25 false false R26.htm 9952175 - Disclosure - SUBSEQUENT EVENTS Sheet http://www.quantinuum.com/role/SUBSEQUENTEVENTS SUBSEQUENT EVENTS Notes 26 false false R27.htm 995445 - Disclosure - Insider Trading Arrangements Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements Insider Trading Arrangements Notes 27 false false R28.htm 9955511 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies) Sheet http://www.quantinuum.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPolicies SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies) Policies 28 false false R29.htm 9955512 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) Sheet http://www.quantinuum.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESTables SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) Tables http://www.quantinuum.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES 29 false false R30.htm 9955513 - Disclosure - OTHER CURRENT ASSETS (Tables) Sheet http://www.quantinuum.com/role/OTHERCURRENTASSETSTables OTHER CURRENT ASSETS (Tables) Tables http://www.quantinuum.com/role/OTHERCURRENTASSETS 30 false false R31.htm 9955514 - Disclosure - PROPERTY AND EQUIPMENT — NET (Tables) Sheet http://www.quantinuum.com/role/PROPERTYANDEQUIPMENTNETTables PROPERTY AND EQUIPMENT — NET (Tables) Tables http://www.quantinuum.com/role/PROPERTYANDEQUIPMENTNET 31 false false R32.htm 9955515 - Disclosure - OTHER INTANGIBLE ASSET—NET (Tables) Sheet http://www.quantinuum.com/role/OTHERINTANGIBLEASSETNETTables OTHER INTANGIBLE ASSET—NET (Tables) Tables http://www.quantinuum.com/role/OTHERINTANGIBLEASSETNET 32 false false R33.htm 9955516 - Disclosure - ACCRUED LIABILITIES (Tables) Sheet http://www.quantinuum.com/role/ACCRUEDLIABILITIESTables ACCRUED LIABILITIES (Tables) Tables http://www.quantinuum.com/role/ACCRUEDLIABILITIES 33 false false R34.htm 9955517 - Disclosure - FAIR VALUE (Tables) Sheet http://www.quantinuum.com/role/FAIRVALUETables FAIR VALUE (Tables) Tables http://www.quantinuum.com/role/FAIRVALUE 34 false false R35.htm 9955518 - Disclosure - LEASES (Tables) Sheet http://www.quantinuum.com/role/LEASESTables LEASES (Tables) Tables http://www.quantinuum.com/role/LEASES 35 false false R36.htm 9955519 - Disclosure - NON-CONTROLLING INTERESTS (Tables) Sheet http://www.quantinuum.com/role/NONCONTROLLINGINTERESTSTables NON-CONTROLLING INTERESTS (Tables) Tables http://www.quantinuum.com/role/NONCONTROLLINGINTERESTS 36 false false R37.htm 9955520 - Disclosure - REVENUE RECOGNITION AND CONTRACTS WITH CUSTOMERS (Tables) Sheet http://www.quantinuum.com/role/REVENUERECOGNITIONANDCONTRACTSWITHCUSTOMERSTables REVENUE RECOGNITION AND CONTRACTS WITH CUSTOMERS (Tables) Tables http://www.quantinuum.com/role/REVENUERECOGNITIONANDCONTRACTSWITHCUSTOMERS 37 false false R38.htm 9955521 - Disclosure - NET EARNINGS PER SHARE (Tables) Sheet http://www.quantinuum.com/role/NETEARNINGSPERSHARETables NET EARNINGS PER SHARE (Tables) Tables http://www.quantinuum.com/role/NETEARNINGSPERSHARE 38 false false R39.htm 9955522 - Disclosure - STOCK-BASED COMPENSATION (Tables) Sheet http://www.quantinuum.com/role/STOCKBASEDCOMPENSATIONTables STOCK-BASED COMPENSATION (Tables) Tables http://www.quantinuum.com/role/STOCKBASEDCOMPENSATION 39 false false R40.htm 9955523 - Disclosure - DESCRIPTION OF ORGANIZATION - Initial Public Offering (Details) Sheet http://www.quantinuum.com/role/DESCRIPTIONOFORGANIZATIONInitialPublicOfferingDetails DESCRIPTION OF ORGANIZATION - Initial Public Offering (Details) Details 40 false false R41.htm 9955524 - Disclosure - DESCRIPTION OF ORGANIZATION - Reorganization Transaction (Details) Sheet http://www.quantinuum.com/role/DESCRIPTIONOFORGANIZATIONReorganizationTransactionDetails DESCRIPTION OF ORGANIZATION - Reorganization Transaction (Details) Details 41 false false R42.htm 9955525 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Customer Concentration (Details) Sheet http://www.quantinuum.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESCustomerConcentrationDetails SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Customer Concentration (Details) Details 42 false false R43.htm 9955526 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Government Grants (Details) Sheet http://www.quantinuum.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESGovernmentGrantsDetails SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Government Grants (Details) Details 43 false false R44.htm 9955527 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Stock-Based Compensation Plan (Details) Sheet http://www.quantinuum.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESStockBasedCompensationPlanDetails SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Stock-Based Compensation Plan (Details) Details 44 false false R45.htm 9955528 - Disclosure - OTHER CURRENT ASSETS (Details) Sheet http://www.quantinuum.com/role/OTHERCURRENTASSETSDetails OTHER CURRENT ASSETS (Details) Details http://www.quantinuum.com/role/OTHERCURRENTASSETSTables 45 false false R46.htm 9955529 - Disclosure - PROPERTY AND EQUIPMENT — NET (Details) Sheet http://www.quantinuum.com/role/PROPERTYANDEQUIPMENTNETDetails PROPERTY AND EQUIPMENT — NET (Details) Details http://www.quantinuum.com/role/PROPERTYANDEQUIPMENTNETTables 46 false false R47.htm 9955530 - Disclosure - OTHER INTANGIBLE ASSET—NET (Details) Sheet http://www.quantinuum.com/role/OTHERINTANGIBLEASSETNETDetails OTHER INTANGIBLE ASSET—NET (Details) Details http://www.quantinuum.com/role/OTHERINTANGIBLEASSETNETTables 47 false false R48.htm 9955531 - Disclosure - ACCRUED LIABILITIES - Schedule of Accrued Liabilities (Details) Sheet http://www.quantinuum.com/role/ACCRUEDLIABILITIESScheduleofAccruedLiabilitiesDetails ACCRUED LIABILITIES - Schedule of Accrued Liabilities (Details) Details 48 false false R49.htm 9955532 - Disclosure - ACCRUED LIABILITIES - Additional Information (Details) Sheet http://www.quantinuum.com/role/ACCRUEDLIABILITIESAdditionalInformationDetails ACCRUED LIABILITIES - Additional Information (Details) Details 49 false false R50.htm 9955533 - Disclosure - FAIR VALUE - Additional Information (Details) Sheet http://www.quantinuum.com/role/FAIRVALUEAdditionalInformationDetails FAIR VALUE - Additional Information (Details) Details 50 false false R51.htm 9955534 - Disclosure - FAIR VALUE - Warrant Liability Roll Forward (Details) Sheet http://www.quantinuum.com/role/FAIRVALUEWarrantLiabilityRollForwardDetails FAIR VALUE - Warrant Liability Roll Forward (Details) Details 51 false false R52.htm 9955535 - Disclosure - FAIR VALUE - Assumptions used to Estimate Fair Value (Details) Sheet http://www.quantinuum.com/role/FAIRVALUEAssumptionsusedtoEstimateFairValueDetails FAIR VALUE - Assumptions used to Estimate Fair Value (Details) Details 52 false false R53.htm 9955536 - Disclosure - LEASES - Lessee (Details) Sheet http://www.quantinuum.com/role/LEASESLesseeDetails LEASES - Lessee (Details) Details 53 false false R54.htm 9955537 - Disclosure - LEASES - Lease Costs (Details) Sheet http://www.quantinuum.com/role/LEASESLeaseCostsDetails LEASES - Lease Costs (Details) Details 54 false false R55.htm 9955538 - Disclosure - LEASES - Supplemental Cash Flow Information (Details) Sheet http://www.quantinuum.com/role/LEASESSupplementalCashFlowInformationDetails LEASES - Supplemental Cash Flow Information (Details) Details 55 false false R56.htm 9955539 - Disclosure - LEASES - Supplemental Balance Sheet Information (Details) Sheet http://www.quantinuum.com/role/LEASESSupplementalBalanceSheetInformationDetails LEASES - Supplemental Balance Sheet Information (Details) Details 56 false false R57.htm 9955540 - Disclosure - LEASES - Maturities of Operating Leases (Details) Sheet http://www.quantinuum.com/role/LEASESMaturitiesofOperatingLeasesDetails LEASES - Maturities of Operating Leases (Details) Details 57 false false R58.htm 9955541 - Disclosure - LEASES - Lessor, Operating Leases, Additional Information (Details) Sheet http://www.quantinuum.com/role/LEASESLessorOperatingLeasesAdditionalInformationDetails LEASES - Lessor, Operating Leases, Additional Information (Details) Details 58 false false R59.htm 9955542 - Disclosure - LEASES - Lessor, Operating Lease Income (Details) Sheet http://www.quantinuum.com/role/LEASESLessorOperatingLeaseIncomeDetails LEASES - Lessor, Operating Lease Income (Details) Details 59 false false R60.htm 9955543 - Disclosure - LEASES - Lessor, Future Minimum Lease Payments to be Received Under the Sub-Lease (Details) Sheet http://www.quantinuum.com/role/LEASESLessorFutureMinimumLeasePaymentstobeReceivedUndertheSubLeaseDetails LEASES - Lessor, Future Minimum Lease Payments to be Received Under the Sub-Lease (Details) Details 60 false false R61.htm 9955544 - Disclosure - LEASES - Lessor, Additional Information (Details) Sheet http://www.quantinuum.com/role/LEASESLessorAdditionalInformationDetails LEASES - Lessor, Additional Information (Details) Details 61 false false R62.htm 9955545 - Disclosure - LEASES - Lessor, Lease Income (Details) Sheet http://www.quantinuum.com/role/LEASESLessorLeaseIncomeDetails LEASES - Lessor, Lease Income (Details) Details 62 false false R63.htm 9955546 - Disclosure - LEASES - Lessor, Supplemental Balance Sheet Information (Details) Sheet http://www.quantinuum.com/role/LEASESLessorSupplementalBalanceSheetInformationDetails LEASES - Lessor, Supplemental Balance Sheet Information (Details) Details 63 false false R64.htm 9955547 - Disclosure - LEASES - Lessor, Future Minimum Lease Payments to be Received Under the Sales-Type Lease (Details) Sheet http://www.quantinuum.com/role/LEASESLessorFutureMinimumLeasePaymentstobeReceivedUndertheSalesTypeLeaseDetails LEASES - Lessor, Future Minimum Lease Payments to be Received Under the Sales-Type Lease (Details) Details 64 false false R65.htm 9955548 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details) Sheet http://www.quantinuum.com/role/COMMITMENTSANDCONTINGENCIESDetails COMMITMENTS AND CONTINGENCIES (Details) Details http://www.quantinuum.com/role/COMMITMENTSANDCONTINGENCIES 65 false false R66.htm 9955549 - Disclosure - STOCKHOLDERS' EQUITY - Amendment and Restatement of Certificate of Incorporation (Details) Sheet http://www.quantinuum.com/role/STOCKHOLDERSEQUITYAmendmentandRestatementofCertificateofIncorporationDetails STOCKHOLDERS' EQUITY - Amendment and Restatement of Certificate of Incorporation (Details) Details 66 false false R67.htm 9955550 - Disclosure - STOCKHOLDERS' EQUITY - Recapitalization from the Reorganization Transactions (Details) Sheet http://www.quantinuum.com/role/STOCKHOLDERSEQUITYRecapitalizationfromtheReorganizationTransactionsDetails STOCKHOLDERS' EQUITY - Recapitalization from the Reorganization Transactions (Details) Details 67 false false R68.htm 9955551 - Disclosure - STOCKHOLDERS' EQUITY - Initial Public Offering (Details) Sheet http://www.quantinuum.com/role/STOCKHOLDERSEQUITYInitialPublicOfferingDetails STOCKHOLDERS' EQUITY - Initial Public Offering (Details) Details 68 false false R69.htm 9955552 - Disclosure - STOCKHOLDERS' EQUITY - Preferred Stock (Details) Sheet http://www.quantinuum.com/role/STOCKHOLDERSEQUITYPreferredStockDetails STOCKHOLDERS' EQUITY - Preferred Stock (Details) Details 69 false false R70.htm 9955553 - Disclosure - NON-CONTROLLING INTERESTS - Additional Information (Details) Sheet http://www.quantinuum.com/role/NONCONTROLLINGINTERESTSAdditionalInformationDetails NON-CONTROLLING INTERESTS - Additional Information (Details) Details 70 false false R71.htm 9955554 - Disclosure - NON-CONTROLLING INTERESTS - Ownership of Common Units (Details) Sheet http://www.quantinuum.com/role/NONCONTROLLINGINTERESTSOwnershipofCommonUnitsDetails NON-CONTROLLING INTERESTS - Ownership of Common Units (Details) Details 71 false false R72.htm 9955555 - Disclosure - NON-CONTROLLING INTERESTS - Summary of the Effect Of Changes in Ownership on the Company's Equity (Details) Sheet http://www.quantinuum.com/role/NONCONTROLLINGINTERESTSSummaryoftheEffectOfChangesinOwnershipontheCompanysEquityDetails NON-CONTROLLING INTERESTS - Summary of the Effect Of Changes in Ownership on the Company's Equity (Details) Details 72 false false R73.htm 9955556 - Disclosure - REVENUE RECOGNITION AND CONTRACTS WITH CUSTOMERS - Disaggregation of Revenue by Products or Service (Details) Sheet http://www.quantinuum.com/role/REVENUERECOGNITIONANDCONTRACTSWITHCUSTOMERSDisaggregationofRevenuebyProductsorServiceDetails REVENUE RECOGNITION AND CONTRACTS WITH CUSTOMERS - Disaggregation of Revenue by Products or Service (Details) Details 73 false false R74.htm 9955557 - Disclosure - REVENUE RECOGNITION AND CONTRACTS WITH CUSTOMERS - Disaggregation of Revenue by Timing of Transfer of Goods or Services (Details) Sheet http://www.quantinuum.com/role/REVENUERECOGNITIONANDCONTRACTSWITHCUSTOMERSDisaggregationofRevenuebyTimingofTransferofGoodsorServicesDetails REVENUE RECOGNITION AND CONTRACTS WITH CUSTOMERS - Disaggregation of Revenue by Timing of Transfer of Goods or Services (Details) Details 74 false false R75.htm 9955558 - Disclosure - REVENUE RECOGNITION AND CONTRACTS WITH CUSTOMERS - Additional Information (Details) Sheet http://www.quantinuum.com/role/REVENUERECOGNITIONANDCONTRACTSWITHCUSTOMERSAdditionalInformationDetails REVENUE RECOGNITION AND CONTRACTS WITH CUSTOMERS - Additional Information (Details) Details 75 false false R76.htm 9955559 - Disclosure - REVENUE RECOGNITION AND CONTRACTS WITH CUSTOMERS - Contract Liability Balances (Details) Sheet http://www.quantinuum.com/role/REVENUERECOGNITIONANDCONTRACTSWITHCUSTOMERSContractLiabilityBalancesDetails REVENUE RECOGNITION AND CONTRACTS WITH CUSTOMERS - Contract Liability Balances (Details) Details 76 false false R77.htm 9955560 - Disclosure - REVENUE RECOGNITION AND CONTRACTS WITH CUSTOMERS - Accounts Receivable and Contract Asset Balances (Details) Sheet http://www.quantinuum.com/role/REVENUERECOGNITIONANDCONTRACTSWITHCUSTOMERSAccountsReceivableandContractAssetBalancesDetails REVENUE RECOGNITION AND CONTRACTS WITH CUSTOMERS - Accounts Receivable and Contract Asset Balances (Details) Details 77 false false R78.htm 9955561 - Disclosure - INCOME TAXES (Details) Sheet http://www.quantinuum.com/role/INCOMETAXESDetails INCOME TAXES (Details) Details http://www.quantinuum.com/role/INCOMETAXES 78 false false R79.htm 9955562 - Disclosure - NET EARNINGS PER SHARE - Calculation of Basic and Diluted Earnings Per Share (Details) Sheet http://www.quantinuum.com/role/NETEARNINGSPERSHARECalculationofBasicandDilutedEarningsPerShareDetails NET EARNINGS PER SHARE - Calculation of Basic and Diluted Earnings Per Share (Details) Details 79 false false R80.htm 9955563 - Disclosure - NET EARNINGS PER SHARE - Summary of Securities Excluded from the Computation of Diluted Loss Per Share (Details) Sheet http://www.quantinuum.com/role/NETEARNINGSPERSHARESummaryofSecuritiesExcludedfromtheComputationofDilutedLossPerShareDetails NET EARNINGS PER SHARE - Summary of Securities Excluded from the Computation of Diluted Loss Per Share (Details) Details 80 false false R81.htm 9955564 - Disclosure - STOCK-BASED COMPENSATION - Quantinuum 2023 Equity Incentive Plan (Details) Sheet http://www.quantinuum.com/role/STOCKBASEDCOMPENSATIONQuantinuum2023EquityIncentivePlanDetails STOCK-BASED COMPENSATION - Quantinuum 2023 Equity Incentive Plan (Details) Details 81 false false R82.htm 9955565 - Disclosure - STOCK-BASED COMPENSATION - Summary of 2023 Awards (Details) Sheet http://www.quantinuum.com/role/STOCKBASEDCOMPENSATIONSummaryof2023AwardsDetails STOCK-BASED COMPENSATION - Summary of 2023 Awards (Details) Details 82 false false R83.htm 9955566 - Disclosure - STOCK-BASED COMPENSATION - Quantinuum 2026 Equity Incentive Plan (Details) Sheet http://www.quantinuum.com/role/STOCKBASEDCOMPENSATIONQuantinuum2026EquityIncentivePlanDetails STOCK-BASED COMPENSATION - Quantinuum 2026 Equity Incentive Plan (Details) Details 83 false false R84.htm 9955567 - Disclosure - STOCK-BASED COMPENSATION - Summary of 2026 Plan (Details) Sheet http://www.quantinuum.com/role/STOCKBASEDCOMPENSATIONSummaryof2026PlanDetails STOCK-BASED COMPENSATION - Summary of 2026 Plan (Details) Details 84 false false R85.htm 9955568 - Disclosure - STOCK-BASED COMPENSATION - IPO Equity Awards (Details) Sheet http://www.quantinuum.com/role/STOCKBASEDCOMPENSATIONIPOEquityAwardsDetails STOCK-BASED COMPENSATION - IPO Equity Awards (Details) Details 85 false false R86.htm 9955569 - Disclosure - STOCK-BASED COMPENSATION - Summary of Stock Option Activity (Details) Sheet http://www.quantinuum.com/role/STOCKBASEDCOMPENSATIONSummaryofStockOptionActivityDetails STOCK-BASED COMPENSATION - Summary of Stock Option Activity (Details) Details 86 false false R87.htm 9955570 - Disclosure - STOCK-BASED COMPENSATION - Summary of Assumptions Used (Details) Sheet http://www.quantinuum.com/role/STOCKBASEDCOMPENSATIONSummaryofAssumptionsUsedDetails STOCK-BASED COMPENSATION - Summary of Assumptions Used (Details) Details 87 false false R88.htm 9955571 - Disclosure - STOCK-BASED COMPENSATION - Summary of Total Stock Compensation Expense (Details) Sheet http://www.quantinuum.com/role/STOCKBASEDCOMPENSATIONSummaryofTotalStockCompensationExpenseDetails STOCK-BASED COMPENSATION - Summary of Total Stock Compensation Expense (Details) Details 88 false false R89.htm 9955572 - Disclosure - SEGMENTS (Details) Sheet http://www.quantinuum.com/role/SEGMENTSDetails SEGMENTS (Details) Details http://www.quantinuum.com/role/SEGMENTS 89 false false R90.htm 9955573 - Disclosure - RELATED PARTY TRANSACTIONS - Additional Information (Details) Sheet http://www.quantinuum.com/role/RELATEDPARTYTRANSACTIONSAdditionalInformationDetails RELATED PARTY TRANSACTIONS - Additional Information (Details) Details 90 false false R91.htm 9955574 - Disclosure - RELATED PARTY TRANSACTIONS - Transition Service Agreement (Details) Sheet http://www.quantinuum.com/role/RELATEDPARTYTRANSACTIONSTransitionServiceAgreementDetails RELATED PARTY TRANSACTIONS - Transition Service Agreement (Details) Details 91 false false R92.htm 9955575 - Disclosure - RELATED PARTY TRANSACTIONS - Strategic Services And Supply Agreements (Details) Sheet http://www.quantinuum.com/role/RELATEDPARTYTRANSACTIONSStrategicServicesAndSupplyAgreementsDetails RELATED PARTY TRANSACTIONS - Strategic Services And Supply Agreements (Details) Details 92 false false R93.htm 9955576 - Disclosure - RELATED PARTY TRANSACTIONS - Leases (Details) Sheet http://www.quantinuum.com/role/RELATEDPARTYTRANSACTIONSLeasesDetails RELATED PARTY TRANSACTIONS - Leases (Details) Details 93 false false R94.htm 9955577 - Disclosure - RELATED PARTY TRANSACTIONS - Other Related Party Transactions (Details) Sheet http://www.quantinuum.com/role/RELATEDPARTYTRANSACTIONSOtherRelatedPartyTransactionsDetails RELATED PARTY TRANSACTIONS - Other Related Party Transactions (Details) Details 94 false false R95.htm 9955578 - Disclosure - SUBSEQUENT EVENTS (Details) Sheet http://www.quantinuum.com/role/SUBSEQUENTEVENTSDetails SUBSEQUENT EVENTS (Details) Details http://www.quantinuum.com/role/SUBSEQUENTEVENTS 95 false false All Reports Book All Reports qnt-20260630.htm qnt-20260630.xsd qnt-20260630_cal.xml qnt-20260630_def.xml qnt-20260630_lab.xml qnt-20260630_pre.xml http://fasb.org/us-gaap/2026 http://xbrl.sec.gov/dei/2026 http://xbrl.sec.gov/ecd/2026 true true