From Root
to Qubit.
Quantisimo connects cryptographic roots of trust and post-quantum silicon with quantum interconnects, quantum networking, processors and low-Earth-orbit infrastructure. One integrated stack, engineered for operators who need to control the technology their critical systems will depend on.
What “pure-play” means here
A Quantum Pure-Play company derives its principal value proposition from participation in the quantum technology ecosystem. Quantisimo combines proprietary technologies, strategic holdings, intellectual property and investments sourced from the SEALQuantum portfolio to give investors direct, concentrated exposure to the quantum economy.
- Focus
- Primary operations and investment profile in quantum computing, networking, sensing and quantum-era cybersecurity. Quantum is the business, not a side project.
- Vertical
- Capabilities stacked from the cryptographic root of trust up to the physical systems that generate, transmit and process quantum information.
- Sovereign
- Trusted control of IP, security architecture and deployment choices, so governments and infrastructure operators are not locked into a single foreign supplier.
- Enabling
- Post-quantum security, trusted transactions and secure satellite links act as enabling layers and early revenue applications of the platform.
The Root to Qubit stack, layer by layer
Seven layers, from the root certificate that anchors device identity to quantum-secure links in low Earth orbit. Each layer lists its physics, the hardware involved and the companies that supply it. Ownership is marked: what Quantisimo receives at closing, what the parent group provides, and where the wider SEALQuantum ecosystem sits.
Why microwave qubits need an optical bridge
Superconducting and spin processors run on microwave photons inside a dilution refrigerator. Fibre networks run on telecom light at room temperature. The interconnect layer exists because those two worlds sit about four orders of magnitude apart in photon energy.
Frequency, log scale. Thermal markers show kBT/h, the frequency at which thermal photons dominate.
A 5 GHz qubit photon carries about 21 µeV. A 1550 nm telecom photon carries about 0.80 eV. That is a ratio near 3.9 × 10⁴.
At room temperature, thermal energy sits near 6.2 THz, far above any microwave qubit. A microwave photon sent down a warm cable is lost in noise. An optical photon is not, which is why quantum information must be converted to light before it leaves the cryostat.
Miraex builds that converter: traveling-wave electro-optic transducers on thin-film lithium tantalate photonic integrated circuits, operating from MHz to beyond 100 GHz, cryogenic-compatible, with microwave-optical entanglement demonstrated on platform.
Qubit modalities and quantum tools in the ecosystem
The interconnect layer is modality-agnostic. These are the processor and software technologies the SEALQuantum ecosystem has backed, and how each connects back to the stack.
| Company | Technology | Physical platform | Stack link | Status |
|---|---|---|---|---|
| Quobly | Silicon spin-qubit processors | FD-SOI CMOS, built on 15+ years of CEA-Leti and CNRS research; foundry-compatible scaling path | PQC-enabled control and QVault TPM for secure-by-design QPUs | SEALQuantum Fund · Series A lead |
| EeroQ | Electrons on helium | Single electrons trapped above superfluid helium, targeting scalable, fault-tolerant architectures | Joint secure quantum computing platform with SEALSQ post-quantum security | SEALSQ strategic investor |
| ColibriTD | Quantum solvers | Hardware-agnostic optimisation solvers; QaaS offering with SEALSQ | IR-drop optimisation for sub-7 nm nodes with Xdigit; yield target 50% → 80% | SEALSQ investment |
| Miraex | Quantum transduction | Thin-film lithium tantalate PICs; microwave↔optical conversion | Interconnect layer; QKD and the Quantum Orbital Space Cloud | Contributed at closing |
Post-quantum cryptography, in silicon
Shor’s algorithm on a fault-tolerant machine breaks RSA and elliptic-curve cryptography. Grover’s algorithm halves the effective strength of symmetric keys. Data captured today can be decrypted later, so the migration deadline is set by data lifetime, not by the date the first large machine switches on.
| Function | Standard | Replaces |
|---|---|---|
| Key encapsulation | FIPS 203 · ML-KEM (Kyber) | RSA / ECDH key exchange |
| Digital signature | FIPS 204 · ML-DSA (Dilithium) | RSA / ECDSA signatures |
| Hash-based signature | FIPS 205 · SLH-DSA (SPHINCS+) | Conservative fallback |
| Symmetric | AES-256 | AES-128 margin under Grover |
The Quantum Shield QS7001 implements Kyber-512/768/1024 and Dilithium-2 in hardware on a secured 80 MHz RISC-V core, alongside RSA, ECC and AES for crypto-agile hybrid deployments. Common Criteria EAL5+ evaluation is in progress and has not yet been granted.
Mosca exposure check
If data must stay secret for x years and migration takes y years, you are exposed when x + y > z, the years until a cryptographically relevant quantum computer. Illustrative tool.
Business combination with GigCapital8
Quantisimo and GigCapital8 will become wholly owned subsidiaries of Quantisimo Holding Corp., a newly formed British Virgin Islands company expected to list on the Nasdaq Capital Market as QSMO.
| Consideration to WISeQey & SEALSQ | 66,610,000 PubCo shares |
| Implied pro forma equity value | ≈ $666.1M at $10.00 |
| Control | WISeQey & SEALSQ expected majority |
| Minimum cash condition | $15M (trust + PIPE + SEALSQ match) |
| PIPE pricing floor | ≥ $10.00 per share |
| Lock-up | 6 months, sponsor & contributors |
| Initial portfolio | Miraex · SEALCOIN · WeCan · WISeSat.Space |
| Registration | Form F-4 to be filed with the SEC |
| Counsel | Rimon · Harneys · DLA Piper |
- 2 Jun 2026SEALSQ acquires 100% of Miraex, closing the interconnect layer of the stack.
- 24 Jun 2026Letter of intent with GigCapital8 announced; Quantisimo established as SPV.
- 5 Oct 2026WISeQey begins trading on Nasdaq and SIX as WQEY.
- 9 Oct 2026Definitive Agreement and Plan of Merger signed; all boards approve.
- Q1 2027 · expectedGigCapital8 shareholder vote, F-4 effectiveness, closing and QSMO listing.