QTREX interconnect hits 100 dB isolation in cryogenic tests
QTREX Quantum (Nasdaq: QTEX) has published independent test results showing its additively manufactured electronics (AME) cryogenic interconnect achieved channel-to-channel isolation exceeding 100 dB across the 4 to 8 GHz qubit control band, at an operating temperature of 20 millikelvin. The tests were conducted by an unnamed but described leading quantum computing company using its own cryogenic system, instruments, reference cables and calibration standards. A binding commercial agreement between the two parties is said to be in final negotiation, with the counterparty's identity expected to be disclosed within weeks.
The benchmark figures released alongside the announcement are specific. Adjacent channels on a 0.34 mm pitch over a 15 cm run showed no detectable crosstalk above the instrument noise floor. The company says this is more than 60 dB better than the published 40 dB crosstalk specification of the leading flexible cryogenic cabling currently on the market. Additional results include insertion loss of approximately 1 dB at 1 GHz and 2 dB at 6 GHz including connectors, impedance uniformity previously associated only with machined coaxial cable, and performance stability across repeated cooldown cycles, significant bending, and vacuum exposure.
Technical significance
The interconnect challenge at millikelvin temperatures is not simply an engineering refinement. Each qubit requires multiple microwave lines running from room temperature down to the dilution refrigerator's base stage, and today's thousand-qubit systems already require thousands of individually hand-assembled coaxial cables. At a million qubits, that assembly model is not feasible. QTREX's monolithic AME approach integrates fully shielded channels at roughly 30 per centimetre of width, with shared shield walls between adjacent channels designed to reduce excess thermal mass. The company says its interconnect conducts approximately half the heat of an equivalent coaxial cable, a material consideration given that cooling power at the millikelvin stage is severely constrained.
Chief executive Dagi Ben-Noon described the testing conditions as "the coldest, most unforgiving environment in computing," adding that 60 dB additional isolation compared with leading flexible cabling represents "not an improvement but a different category." QTREX expects to announce further agreements with quantum computing companies in the fourth quarter of 2026.
Market and competitive context
The cryogenic interconnect market is a specialist niche within the broader quantum infrastructure supply chain, but it is attracting growing attention as superconducting qubit counts scale. Established suppliers of cryogenic RF cabling and connectors include a small number of specialist manufacturers, and hyperscalers and national laboratories procuring quantum systems have begun specifying interconnect performance as a procurement criterion.
QTREX's positioning is notable for relying on additive manufacturing rather than conventional machined or flexible-cable approaches, which the company argues enables density, phase matching and thermal efficiency that machined coax cannot match at scale. The claim of phase-matched channels formed in a single monolithic body is directly relevant to qubit readout fidelity, an area where crosstalk is a recognised error source in current superconducting processors.
The company's Nasdaq listing and its undisclosed agreement with a named quantum computing leader will be closely watched. The identity of the testing partner matters commercially: validation by a top-tier quantum OEM would carry considerably more weight than a contract with a smaller research group. Investors and prospective customers should note that full agreement terms and counterparty name have not yet been released, and the company carries forward-looking statements risk on all projected Q4 announcements.