The quantum computing industry has spent the last three years measured almost entirely in qubits. Willow’s 105. Nighthawk’s 120. The 540-qubit superconducting platform that integrated nearly 700 control lines into a single cryostat last year. The qubit count is the headline number, and for good reason.

But inside the labs trying to push superconducting systems past today’s ceiling, engineers spend a surprising amount of time talking about something far less photogenic: the cables.

Every superconducting qubit needs multiple control and readout lines threading from room-temperature instrumentation down to the millikelvin plate where the processor sits. Every additional line carries heat, takes up space, and introduces electromagnetic noise. At a few hundred qubits, the wiring is already hand-built artisanal work. At a few thousand, it stops fitting. At the million-qubit scale fault-tolerant computing requires, the conventional approach simply doesn’t work.

That’s the bottleneck a company called QTREX is positioning itself around.

The Wall the Industry Walked Into

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The “I/O wall”, shorthand for the interconnect problem, has been flagged in the engineering world for years, and the timing is starting to bite. IBM’s roadmap targets near-term quantum advantage by the end of 2026 and a fault-tolerant machine by 2029. None of those roadmaps work if the interconnect layer can’t keep up.

QTREX’s argument is that this isn’t a cable problem. It’s an architecture problem.

The company’s approach aims to replace the conventional assembled bundle, cables, connectors, shielding, thermal anchors, mechanical routing, with one integrated structure manufactured as a single object. The capability comes from Additively Manufactured Electronics, or AME: a multi-material 3D printing platform that deposits conductive and dielectric inks together to produce 3D electronic geometries at micron-level precision. Until recently it was used for high-performance RF circuits and antennas in defense and aerospace. The Israeli company is now applying it to quantum’s hardest hardware constraint.

In plain language, the company’s pitch is that traditional quantum wiring is assembled, while QTREX’s is engineered as a single system. The company claims roughly 20 fully shielded conductors per square centimeter, a density that matters precisely because what limits a cryostat isn’t volume, it’s the thermal budget that volume carries with it.

Why This Could Become a Category

In late April, QTREX signed a joint development agreement with Qarakal Quantum, the Israeli full-stack superconducting quantum company connected to Israel Aerospace Industries and the Hebrew University of Jerusalem. Qarakal built Israel’s first domestically operated quantum computer. Under the agreement, QTREX is supplying 3D-printed structures for testing at milli-Kelvin temperatures inside Qarakal’s cryogenic development environment.

Three weeks later, the company disclosed it had moved into a joint technical evaluation with one of the top five global quantum computing companies. Engineering and integration teams from both sides are testing QTREX’s interconnect components inside the partner’s cryogenic refrigerator. If a definitive agreement follows, QTREX would sit as foundational interconnect technology beneath the partner’s forward quantum hardware roadmap.

Traction extends beyond quantum-native players. A Tier-1 US defense customer has taken delivery of an AME system, and an implementation is underway at one of the Magnificent Seven US technology companies, the cohort that increasingly owns the world’s quantum research budgets.

“Engagement with one of the top five global players in quantum systems reflects the recognition that QTREX’s interconnect approach addresses a complex bottleneck in quantum hardware,” CEO Dagi Ben-Noon said when announcing the evaluation.

The Shift the Industry Is Already Making

The first wave of quantum computing was a physics story: could a working qubit be built and controlled. Those questions are mostly answered. The next wave is an engineering story, whether the surrounding hardware can scale with the processors. In AI infrastructure, the most valuable companies turned out not to be the ones writing the models but the ones building the chips and interconnects underneath. The same shape is starting to appear in quantum.

QTREX is betting the connective layer is where one of those positions opens up. The company still needs to execute commercially, but the problem it is targeting is already recognized across the industry.