Exhibit 23.1

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INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM’S CONSENT

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We consent to the inclusion in this Registration Statement of Arqit Quantum Inc. on Form F-1 of our report dated March 31, 2021, with respect to our audit of the financial statements  of Centricus Acquisition Corp. as of December 31, 2020 and for the period from November 24, 2020 (inception) through December 31, 2020, which report appears in the Prospectus, which is part of this Registration Statement. We were dismissed as auditors effective September 3, 2021 and, accordingly, we have not performed any audit or review procedures with respect to any financial statements appearing in such Prospectus for the periods after the date of our dismissal. We also consent to the reference to our Firm under the heading “Experts” in such Prospectus.

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/s/ Marcum LLP

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Marcum LLP

New York, NY

October 1, 2021