| Document and Entity Information | Oct. 20, 2023 |
| Entity Listings [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Oct. 20, 2023 |
| Entity File Number | 001-41468 |
| Entity Registrant Name | D-Wave Quantum Inc. |
| Entity Central Index Key | 0001907982 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 88-1068854 |
| Entity Address, Address Line One | 2650 East Bayshore Road |
| Entity Address, City or Town | Palo Alto |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94303 |
| City Area Code | 604 |
| Local Phone Number | 630-1428 |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Common Stock [Member] | |
| Entity Listings [Line Items] | |
| Title of 12(b) Security | Common stock, par value $0.0001 per share |
| Trading Symbol | QBTS |
| Security Exchange Name | NYSE |
| Warrants, each whole warrant exercisable for 1.4541326 shares of common stock at an exercise price of $11.50 [Member] | |
| Entity Listings [Line Items] | |
| Title of 12(b) Security | Warrants, each whole warrant exercisable for 1.4541326 shares of common stock at an exercise price of $11.50 |
| Trading Symbol | QBTS.WT |
| Security Exchange Name | NYSE |
