Silicon-based quantum computing is gaining momentum as companies look to scale qubit architectures using established semiconductor manufacturing. SEALSQ said it is sharpening its focus on CMOS-compatible quantum architectures, targeting silicon spin qubits and electrons-on-helium platforms as the foundation for scalable, secure quantum processors.
SEALSQ plans to concentrate investment on qubit technologies that align with conventional CMOS fabrication flows. Silicon spin qubits use electrons confined in silicon structures manufactured with processes similar to mainstream chip production, offering a potential path to higher integration density and yield. Electrons-on-helium platforms position electrons above superfluid helium on silicon substrates, leveraging CMOS-compatible control electronics while aiming to reduce noise. The company also highlighted fully depleted silicon-on-insulator (FDSOI) as a candidate process technology, citing its lower power consumption and reduced noise characteristics at the wafer level.
Beyond hardware, SEALSQ is embedding post-quantum cryptography (PQC) and hardware-based trust mechanisms directly into quantum system architectures. The company said secure elements integrated with quantum control circuitry can enable trusted boot, device attestation, and secure key storage. SEALSQ positions this approach as essential for distributed quantum systems, where cryogenic electronics, FPGA-based qubit control, and cloud orchestration layers must exchange sensitive calibration and operational data securely.
• Focus on CMOS-compatible quantum architectures to enable scalable silicon-based quantum computing
• Targeted qubit platforms: silicon spin qubits and electrons-on-helium
• Emphasis on FDSOI process technology to balance noise and power consumption
• Integration of PQC algorithms into secure silicon for quantum control systems
• Hardware-based trust features including secure boot, device attestation, and protected key storage
• Applications include government, industrial, defense, automotive, and critical infrastructure environments
Carlos Moreira, Founder and CEO of SEALSQ, said: “From our perspective, this technology alignment is a real advantage over other quantum approaches, such as superconducting or ion-trap systems. While those platforms are scientifically impressive, they often depend on specialized materials, custom fabrication steps, or complex optical and vacuum setups that do not align as naturally with mainstream semiconductor manufacturing. In contrast, silicon spin qubits and electrons-on-helium architectures are designed from the start to evolve within the semiconductor ecosystem. This alignment not only accelerates learning cycles but also ensures a smooth transition from research to production. Most importantly, it allows us to enable security-by-design through post-quantum cryptography (PQC) and hardware-based trust, positioning SEALSQ at the intersection of quantum innovation and secure manufacturing.”
🌐 Analysis: SEALSQ’s strategy reflects a broader industry shift toward silicon-based quantum platforms that can leverage existing CMOS fabs rather than bespoke fabrication lines. Research groups and startups globally are exploring silicon spin qubits as a path to higher qubit density and manufacturability, while electrons-on-helium remains an emerging approach aimed at noise reduction and scalability.
At the same time, the integration of post-quantum cryptography into hardware aligns with growing regulatory and enterprise demand for quantum-resilient security. As quantum processors evolve from laboratory systems to networked infrastructure, vendors that combine qubit development with secure silicon and trusted provisioning could differentiate in government and critical infrastructure markets.
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