Superconducting circuits, a technology IBM abandoned in 1983 after a decade of heavy investment, are now at the center of a quiet but significant push to build more capable quantum computers. The company leading that effort is SEEQC, a quantum chip foundry that traces part of its lineage directly to IBM’s shuttered superconducting computing program.
SEEQC operates a fabrication facility in upstate New York where technicians in full-body protective suits deposit ultrathin layers of the superconducting metal niobium onto dielectric materials, building delicate layered structures. Lithography devices then use light to inscribe circuits onto those structures. The entire floor runs under yellow light, which interferes less with the chip-making process than other wavelengths. It is a precise, slow, exacting operation.
Why Superconductors Got Left Behind
The physics case for superconducting materials in computing is straightforward. Superconductors transmit electricity with perfect efficiency, generating no heat. Conventional computers do the opposite. In 2017, computer scientist Michael Frank put it plainly: “A conventional computer is, essentially, an expensive electric heater that happens to perform a small amount of computation as a side effect.”
The problem is maintaining superconductivity. All known superconductors require temperatures only a few degrees above absolute zero, or extreme pressure, to function. In the early 1980s, that requirement made superconducting computers impractical. IBM pulled out of the research in 1983. Heat-generating conventional chips won by default, and energy costs in computing have climbed steadily ever since, accelerating sharply with the recent surge in AI workloads.
A Different Problem, a Different Opportunity
The revival of superconducting technology came through a different door. In 1999, a research team in Japan built the first superconducting quantum bit, or qubit, the basic unit of a quantum computer. That was not an attempt to replicate conventional computing with better materials. It opened access to a fundamentally different kind of computation, one that processes information through mechanisms with no equivalent in classical machines.
Superconducting qubits have since become central to some of the most advanced quantum systems in existence. Google and IBM both rely on them in their leading quantum hardware. Certain demonstrations of quantum supremacy over classical computers remain uncontested, supporting the argument that these machines represent a genuinely new category of computing.
SEEQC’s Role in the Stack
SEEQC chief executive John Levy handed a finished superconducting chip to a visiting journalist during a recent tour of the facility. The device was notably small and square. Its ambitions are considerably larger.
The company’s focus is not just on building qubits but on the supporting chip architecture that quantum computers require to function reliably at scale. Superconducting classical control chips, operating at the same frigid temperatures as the qubits themselves, could reduce the enormous overhead currently required to manage quantum systems. That is the practical gap SEEQC is targeting.
The energy cost that made superconducting computing unworkable in 1983 now looks like a feature rather than a flaw. Quantum computers already require extreme cooling to operate. A control architecture that runs efficiently at those same temperatures sidesteps the thermal management problems that plague today’s systems. The 1980s technology that lost to the electric heater may yet find its moment inside one.
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