$200M Quantum Fund Fuels SEALSQ’s Vertical Stack Expansion

SEALSQ Corp has acquired Miraex SA, a Swiss developer of photonics-based quantum interconnects located at the EPFL Innovation Park in Ecublens, completing its quantum sovereign vertical stack. The strategic acquisition closes the quantum interconnect layer of its architecture, uniting post-quantum silicon, orbital infrastructure, and distributed quantum sensing. This investment, funded by SEALSQ’s 200 million internal “SEALQUANTUM” fund, of which over 65 million has already been deployed in several projects, marks a defining step in the company’s Root-to-Qubit architecture. The move also accelerates the Quantum Orbital Space Cloud (QOSC) program, SEALSQ’s initiative to deploy quantum-secure infrastructure in Low Earth Orbit (LEO) and beyond.

SEALSQ Completes Quantum Sovereign Vertical Stack with Miraex Acquisition

Over 65 million from the internally-funded SEALQUANTUM initiative has been allocated to various projects, and the Miraex acquisition represents part of this early investment. These photonic integrated circuits (PICs) are designed to convert quantum information between microwave and optical frequencies, a foundational capability for distributed quantum architectures to function at scale. According to SEALSQ, this acquisition “closes the quantum interconnect layer” of their architecture, addressing a critical gap in their previously developed capabilities. Miraex’s work is structured around three key areas: Distributed Quantum Computing, Quantum Sensing, and Quantum Networking, all intended to integrate with SEALSQ’s existing platform. The TFLT PICs are particularly well-suited for space deployment due to their compact size, low power consumption, and inherent radiation tolerance. SEALSQ now controls all layers necessary for delivering secure, space-grade quantum connectivity, including space-grade photonic integration, Quantum Key Distribution (QKD) at scale, and distributed orbital sensing capabilities. Carlos Moreira, Chairman & CEO, SEALSQ Corp, emphasized the significance of this milestone, stating that with Miraex now fully integrated, the Quantum Sovereign Vertical Stack is complete. He continued, “For SEALSQ, the quantum internet is a buildable, deployable roadmap that we can now begin to execute with customers, partners, and governments.”

Thin Film Lithium Tantalate PICs Enable Quantum Interconnect Layer

Currently, a significant hurdle to a functional quantum internet is reliably connecting disparate quantum processors and sensors. While progress has been made in building quantum processing units using superconducting circuits, trapped ions, or photonic systems, translating quantum information between these systems and extending it over long distances remains a complex engineering challenge. Current approaches often rely on bulky and energy-intensive equipment, hindering scalability and practical deployment. Recent developments, however, suggest a pathway forward through integrated photonics, specifically Thin Film Lithium Tantalate (TFLT) Photonic Integrated Circuits (PICs). This move effectively closes the quantum interconnect layer of SEALSQ’s Quantum Sovereign Vertical Stack, a comprehensive architecture aiming to control every aspect of quantum technology from chip design to orbital infrastructure.

Miraex’s core innovation lies in its TFLT PIC platform, which facilitates the crucial conversion of quantum information between microwave frequencies, the native language of many quantum processors, and optical frequencies, ideal for long-distance transmission via fiber optic cables or free space. This transduction process is a foundational capability without which distributed quantum architectures cannot function at scale. These areas are expected to extend SEALSQ’s existing platform. Crucially, these PICs are particularly well-suited for deployment in harsh environments, such as space, because they are compact, power-efficient, and radiation-tolerant by design, attributes critical for nanosatellites, CubeSats, and the broader Quantum Orbital Space Cloud (QOSC) constellation.

Quantum Orbital Space Cloud (QOSC) Reinforced by Photonic Integration

The acquisition isn’t simply an expansion of research and development; it’s a strategic consolidation intended to close a gap in its architecture, a critical component for realizing a fully sovereign quantum architecture. Miraex’s acquisition closes the quantum interconnect layer of SEALSQ’s Quantum Sovereign Vertical Stack, bridging 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 and optical frequencies, a foundational capability for distributed quantum architectures to function at scale. TFLT PICs are compact, power-efficient, and radiation-tolerant by design, attributes critical for deployment on nanosatellites, CubeSats, and the broader QOSC constellation. This isn’t merely about technological advancement; it’s about establishing a vertically integrated “Quantum Sovereign Vertical Stack,” encompassing everything from post-quantum semiconductors to orbital infrastructure.

SEALQUANTUM Fund Drives Portfolio of Quantum Technology Investments

SEALSQ’s expansion into a fully integrated quantum technology stack is being fueled by the 200 million SEALQUANTUM fund, with over $65 million already committed to strategic acquisitions and internal projects. SEALSQ’s strategy extends beyond interconnection; the company is actively building capabilities across three key areas, including Distributed Quantum Computing, aiming to scale computational power beyond the limitations of single devices; Quantum Sensing, focused on precision navigation and monitoring; and Quantum Networking, envisioning a globally entangled quantum internet secured by Quantum Key Distribution (QKD). “Today’s closing of the Miraex acquisition marks a watershed moment for SEALSQ and for the broader quantum ecosystem,” said Carlos Moreira, Chairman & CEO, SEALSQ Corp. Space, Quantix Edge Security, and WeCan Group SA demonstrate a comprehensive approach to establishing a fully sovereign quantum ecosystem, accessible through SEALQuantum.com.