SEALSQ Corp has declared its intention to purchase 100% of the equity interest in Miraex SA, a Swiss-based leader in photonics-based quantum interconnect systems, in a move that portends a significant consolidation in the European technology scene. This historic acquisition, made possible by the SEALSQ Quantum Fund, represents a significant growth for the cybersecurity company as it works to create the first fully integrated “Quantum Vertical Stack” in history. The agreement, which was made public on March 2026, intends to advance the business into the field of planetary-scale quantum infrastructure rather than just individual semiconductor components.
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Strategic Acquisition and Exclusivity
A 60-day exclusivity period is included in the signed Letter of Intent (LOI), during which SEALSQ and Miraex shall negotiate final deal documentation and carry out confirmatory due diligence. With its headquarters located in the esteemed EPFL Innovation Park in Ecublens, Switzerland, Miraex has reached legally binding agreements. Subject to the fulfillment of typical closing conditions and regulatory procedures relevant to such high-tech acquisitions, the deal is anticipated to be finalized by the end of June 2026.
A well-known pioneer in post-quantum semiconductor and cybersecurity technologies, SEALSQ is a division of WISeKey International Holding Ltd (NASDAQ: WKEY). The company plans to realize its vision of a vertically integrated technology stack and bolster its strategic investment program by incorporating Miraex.
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Miraex: The “Connective Tissue” of Quantum
Thin Film Lithium Tantalate (TFLT) Photonic Integrated Circuits (PICs) are the area of expertise for deep-tech pioneer Miraex. This patented technological platform serves as a crucial hardware layer that enables the conversion, transmission, and linking of quantum information across future quantum networks and distinct quantum computers.
Scalability is currently a major problem for the sector. The number of qubits that individual quantum processors can sustain is typically their limit, notwithstanding their successful development. These processors need to be connected to cooperate to address complicated global issues. The majority of superconducting quantum computers use microwave signals at temperatures close to absolute zero, yet quantum information is extremely delicate. The capacity of Miraex to function as a high-efficiency translator, transforming these microwave quantum states into optical photons the preferred medium for long-distance communication via fiber optics or satellite links without losing their “quantumness” is what makes it so special.
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Completing the Quantum Vertical Stack
The entire range of quantum technology, from microscopic chips to global network designs, is encompassed in SEALSQ’s concept for its Quantum Vertical Stack. Three different levels of expertise will now be possessed by the united entity:
- The Security Layer: Based on SEALSQ’s current Root of Trust (RoT) services and Post-Quantum Cryptography (PQC) chips. The purpose of these “Quantum Shield” chips is to safeguard traditional data against the impending threat of quantum computers.
- The Interconnect Layer: This layer bridges hardware and networks using Miraex‘s microwave-to-optical transduction technology.
- The Network Layer: Enabling the construction of globally entangled quantum networks, which will serve as the foundation for the Quantum Internet of the future.
According to Carlos Moreira, CEO of SEALSQ, Miraex is precisely the kind of fundamental asset needed to connect the organization’s networking, computing, and cryptographic capabilities into a cohesive architecture.
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Three Pillars of Innovation
Three crucial quantum verticals are added to SEALSQ’s portfolio by the acquisition:
- Distributed Quantum Computing (DQS): This technology makes it possible for several smaller quantum computers to “talk” to each other at the speed of light, functioning as a single, enormous calculating unit.
- Quantum Sensing: Miraex creates incredibly accurate sensors for geophysics, aircraft, and defense using photonic entanglement. These sensors can function in situations where GPS is not available or where extremely precise detection of magnetic anomalies is required.
- Quantum Networking: Under the rules of quantum mechanics, this pillar focuses on creating the framework for physically secure communication that cannot be intercepted without notice.
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Expanding into the “Orbital Cloud”
The SEALSQ Quantum Spatial Orbital Cloud (QSOC) project is a key factor in the acquisition. The goal of this flagship project is to provide quantum-secure capabilities throughout Low Earth Orbit (LEO) and beyond. Because Miraex‘s TFLT PICs are small, power-efficient, and naturally radiation-tolerant essential characteristics for satellite payloads they are especially well-suited for this mission.
SEALSQ anticipates accelerating its goal of expanding quantum-secure infrastructure throughout terrestrial and space-based ecosystems by incorporating this technology into nanosatellites and CubeSats. By establishing quantum entanglement between satellites and ground stations, this space-grade integration successfully circumvents the distance constraints of conventional terrestrial fiber optics.
Addressing the “Quantum Threat”
The growing “Quantum Threat” is the larger industrial context for this transaction. Conventional encryption techniques like RSA and Elliptic Curve Cryptography (ECC) are become more susceptible as quantum computers develop. In a number of areas, including medical and healthcare systems, automotive (EV charging), smart energy, and industrial automation, SEALSQ is leading the way in the development of post-quantum semiconductors that offer strong, future-proof protection for sensitive data.
SEALSQ makes sure that businesses are safe from these new risks by integrating Post-Quantum Cryptography into its semiconductor products. To assist businesses in navigating this shift, the company’s “Quantum Lab” also provides services including Quantum as a Service and best practice consultancy.
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The Path Forward
The CEO of Miraex, Daniel Brau, expressed hope for the collaboration between the two companies, saying that SEALSQ’s global presence and semiconductor know-how will speed up Miraex’s goal of connecting quantum on a planetary scale. This acquisition represents a shift in the tech sector from experimental research to commercial infrastructure.
When the integration of Miraex’s technology is finished, SEALSQ’s end-to-end platform should perform better and be more resilient. Traveling wave transducer designs are among the proprietary patents held by Miraex, a member of the Swiss National Startup Team, guaranteeing that SEALSQ stays at the forefront of the second quantum revolution. SEALSQ is not only safeguarding data by securing the “connective tissue” supplied by Miraex, but it is also constructing the high-speed highway that quantum information will use for decades to come.
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