Company: IONQ
Filing Date: 2025-06-06
Form Type: S-8
Source: 0001193125-25-137111
Chunk: 6

Company: IonQ, Inc.
Filing Date: 2025-06-06
Form: S-8
Chunk 6
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 behalf by the undersigned, thereunto duly authorized in the City of College Park, State of Maryland, on this 6th day of June, 2025.

| IONQ, INC. |     |                                       |
| By:        |     | /s/ Niccolo de Masi                   |
|            |     | Niccolo de Masi                       |
|            |     | President and Chief Executive Officer |

POWER OF ATTORNEY KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below hereby constitutes and appoints Niccolo de Masi and Thomas Kramer, and each of them, as his or her true and lawful agents, proxies and attorneys-in-fact,with full power of substitution and resubstitution, for him or her and in his or her name, place and stead, in any and all capacities, to sign any and all amendments to this Registration Statement (including post-effective amendments), and to file the same, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact,proxies and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in connection therewith, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact,proxies and agents, or any of them, or his or her substitute or substitutes, may lawfully do or cause to be done by virtue hereof. Pursuant to the requirements of the Securities Act of 1933, as amended, this registration statement has been signed by the following persons in the capacities and on the dates indicated.

| Name                   
 /s/ Niccolo de Masi    
 Niccolo de Masi        
 /s/ Thomas Kramer      
 Thomas Kramer          |     | Title                                                                            
 President and Chief Executive Officer and Director (Principal Executive Officer) 
 Chief Financial Officer (Principal Financial                                     
 and Accounting Officer)                                                          |     | Date         
 June 6, 2025 
 June 6, 2025 |
|:-----------------------|:----|:---------------------------------------------------------------------------------|:----|:-------------|
| /s/ Robert Cardillo    
 Robert Cardillo        |     | Director                                                                         |     | June 6, 2025 |
| /s/ Peter Chapman      
 Peter Chapman          |     | Director                                                                         |     | June 6, 2025 |
| /