QCBRIEF
SEALSQ, a small cap chipmaker, says its newly acquired Miraex unit can convert quantum signals between microwave and optical frequencies. The performance numbers are not public.
Quantum processors speak microwave. The fiber networks that would link them speak light. SEALSQ says the missing wire is a Miraex chip, but the conversion numbers that would prove it are not public.
SEALSQ, a Geneva-based chipmaker listed on NASDAQ as LAES, said on July 31, 2026 that it is moving Miraex's Thin-Film Lithium Tantalate Photonic Integrated Circuit, a TFLT PIC, into early commercialization. The platform is designed to convert quantum information between microwave and optical frequencies while preserving the qubit's state.
Miraex, based at the EPFL Innovation Park in Ecublens, Switzerland, was fully acquired by SEALSQ on June 2, 2026 per a Form 6-K filing. SEALSQ's reported $200 million Quantum Fund, with more than $65 million deployed to date, financed both the deal and the launch.
The first use cases SEALSQ names are distributed quantum computing, quantum networking, and quantum sensing. Lithium tantalate, the same crystal used in mobile-phone filters, supports low-loss photonic circuits that can be mass-produced and tolerate radiation.
What the announcement does not include: conversion efficiency, added noise, and state-transfer fidelity. Those are the three numbers any quantum-network buyer will ask for. Without them, "early commercialization" is a commercial event, not a technical one.