Form: 20-F

Annual and transition report of foreign private issuers [Sections 13 or 15(d)]

December 9, 2025

Exhibit 8.1

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Subsidiaries of Arqit Quantum Inc.

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Name of Subsidiary

    

Jurisdiction of Incorporation

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Arqit Limited

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United Kingdom

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Arqit Inc.

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Delaware

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Arqit LLC

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Delaware

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