Exhibit 99.1 Arqit Quantum Inc. Announces Financial and Operational Results for the Fiscal Year 2023 $5.6 million of revenue and other operating income from discontinued operations for fiscal year 2023 Revenue for the second half of fiscal year 2023 from the sale of QuantumCloud™ symmetric key agreement encryption technology increased from the first half of fiscal year 2023 New specialised applications of QuantumCloud™ symmetric key agreement encryption technology, including NetworkSecure™, TradeSecure™ and ...