| Document and Entity Information | Aug. 16, 2022 |
| Document And Entity Information [Line Items] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001907982 |
| Document Type | 8-K |
| Document Period End Date | Aug. 16, 2022 |
| Entity Registrant Name | D-Wave Quantum Inc. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-41468 |
| Entity Tax Identification Number | 84-1068854 |
| Entity Address, Address Line One | 3033 Beta Avenue |
| Entity Address, City or Town | Burnaby |
| Entity Address, State or Province | BC |
| Entity Address, Country | CA |
| Entity Address, Postal Zip Code | V5G 4M9 |
| City Area Code | (604) |
| Local Phone Number | 630-1428 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Common Stock Par Value 0.0001 Per Share [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 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] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Warrants, each whole warrant exercisable for 1.4541326 shares of common stock at an exercise price of $11.50 |
| Trading Symbol | QBTS.WS |
| Security Exchange Name | NYSE |
