SEALSQ Corp (NASDAQ:LAES) ("SEALSQ" or the "Company"), a subsidiary of WISeKey International Holding Ltd (NASDAQ:WKEY, SIX: WIHN))) and a global leader in post-quantum semiconductor and cybersecurity solutions, today announced the acquisition of 100% of Miraex SA ("Miraex"), a developer of photonics-based quantum interconnect solutions headquartered at the EPFL Innovation Park in Ecublens, Switzerland.

As part of this strategic transaction, SEALSQ has acquired entire issued share capital of Miraex SA. The investment has been made using the Company's Quantum Fund, SEALQUANTUM.com, an internal strategic investment initiative of SEALSQ using a dedicated allocation of our cash with the goal of accelerating the development of a fully integrated Quantum Vertical Sovereign Stack. The Quantum Fund has total approved capital resources of $ 200 million, of which over $65 million has already been deployed in several projects (including Miraex).

This milestone marks a defining step in the evolution of SEALSQ's Quantum Sovereign Vertical Stack, the Company's Root-to-Qubit architecture encompassing the full spectrum of quantum technology from quantum-resistant semiconductors to orbital space infrastructure. It also represents a pivotal acceleration of the Quantum Orbital Space Cloud (QOSC) program, SEALSQ's flagship initiative to deploy quantum-secure infrastructure across Low Earth Orbit (LEO) and beyond.

THE MISSING LINK: COMPLETING THE QUANTUM SOVEREIGN VERTICAL STACK

Miraex's acquisition closes the quantum interconnect layer of SEALSQ's Quantum Sovereign Vertical Stack, the critical bridge between quantum computing hardware and quantum communication networks. Built around a proprietary Thin Film Lithium Tantalate (TFLT) Photonic Integrated Circuit (PIC) platform, Miraex's technology enables the conversion of quantum information between microwave frequencies (the operating domain of superconducting and semiconductor spin based quantum processors) and optical frequencies (the medium of choice for quantum communication), a foundational capability without which distributed quantum architectures cannot function at scale.

Miraex's capabilities are organized across three quantum verticals that are expected to seamlessly extend SEALSQ's existing platform:

  • Distributed Quantum Computing (DQC) — aimed at enabling interconnection of distributed quantum processors to achieve scalable, collective quantum computational power beyond the limits of any single device.
  • Quantum Sensing — designed to deliver photonic entanglement-based distributed sensing for precision navigation, geophysics, defense, and critical infrastructure monitoring.
  • Quantum Networking — building globally entangled quantum networks as the backbone of the future quantum internet, enabling end-to-end Quantum Key Distribution (QKD) at planetary scale.



     

REINFORCING THE QUANTUM ORBITAL SPACE CLOUD (QOSC)

Miraex's photonic technology is uniquely aligned with the demands of space-based quantum infrastructure. TFLT PICs are compact, power-efficient, and radiation-tolerant by design — attributes critical for deployment on nanosatellites, CubeSats, and the broader QOSC constellation. With this acquisition finalized, SEALSQ now commands every layer of the quantum stack required to deliver secure, space-grade quantum connectivity:

  • Space-Grade Photonic Integration: Miraex's TFLT PICs meet the size, weight, power, and radiation-tolerance requirements for orbital deployment, enabling quantum-secure links between QOSC satellites and terrestrial endpoints.
  • Quantum Key Distribution (QKD) at Scale: Miraex's transduction and entanglement generation capabilities provide the physical-layer substrate for satellite-based QKD, delivering information-theoretically secure communications immune to quantum adversaries.
  • Distributed Orbital Sensing: Quantum sensing payloads enabled by Miraex's platform will extend QOSC's utility to precision Earth observation, sovereign navigation, and early-warning infrastructure.