Post-quantum semiconductor specialist SEALSQ Corp has finalized the acquisition of 100% of the issued share capital of Swiss photonics developer Miraex SA. The transaction was executed via SEALSQ’s internal strategic fund, SEALQUANTUM.com, which commands a $200 million capital pool dedicated to constructing a vertically integrated, sovereign quantum hardware value chain. The acquisition marks the eighth major asset consolidation under the fund, bringing Miraex’s specialized micro-optics laboratory alongside existing subsidiaries, including French ASIC designer IC’ALPS, Murcia-based chip personalization facility Quantix Edge Security, and Swiss compliance infrastructure provider WeCan Group SA.
Technical Architecture & Microwave-to-Optical Quantum Transduction
The acquisition integrates Miraex’s Thin Film Lithium Tantalate (TFLT) Photonic Integrated Circuit (PIC) platform directly into SEALSQ’s hardware roadmap, bridging a critical gap in multi-node quantum networking. Silicon spin and superconducting quantum processors generate and manipulate information within localized cryogenic microwave frequencies (sub-10 GHz). However, microwave photons cannot travel across standard fiber optic lines or open space without instantly suffering thermal decoherence. To construct a distributed quantum network, systems require a low-loss hardware link capable of executing coherent coherent state translation.
Miraex resolves this bottleneck through electro-optical transduction. Its TFLT PIC chips act as a bridge, encoding the fragile quantum states of microwave photons onto optical-frequency photons (near 1550 nm) while preserving phase entanglement. The resulting material properties of the lithium tantalate layer provide high electro-optic coefficients, minimal optical dispersion, and compact power footprints. This configuration enables the hardware to execute multi-node entanglement distribution, establishing the physical-layer foundation required for scalable Distributed Quantum Computing (DQC) clusters and long-range Quantum Key Distribution (QKD) arrays.
Aerospace Integration & Low Earth Orbit Constellation Roadmaps
The consolidation accelerates the development of the Quantum Orbital Space Cloud (QOSC), SEALSQ’s flagship initiative to deploy a quantum-secure communications network across Low Earth Orbit (LEO). The radiation-tolerant and compact architecture of the TFLT PIC framework makes it well-suited for integration into space-grade payloads. Managed by SEALSQ Chairman and CEO Carlos Moreira and Miraex CEO Daniel Brau, the engineering track will focus on embedding these photonic transduction modules directly into the WISeSat.Space nanosatellite constellation. This space-ground infrastructure loop is designed to secure critical global assets against post-quantum cryptographic threats, providing a sovereign, information-theoretically secure routing fabric for the financial, defense, and national security sectors.
The official corporate acquisition documentation can be reviewed via the active SEALSQ investor relations repository here.
June 5, 2026
