The Man Behind the Term
Preskill, who earned his Ph.D. from Harvard University in 1980, is widely recognized as the originator of one of the most consequential phrases in modern computing: “quantum supremacy.” He coined the term in a 2012 paper, defining it as the threshold at which a quantum computer can perform a calculation that no classical computer can solve in a feasible amount of time. The phrase quickly became both a rallying cry and a point of contention across the tech world, capturing a shared aspiration and prompting intense debate over what would constitute a genuine demonstration. Preskill’s own contributions to quantum information theory extend well beyond terminology. His foundational work on quantum error correction and fault-tolerant quantum computing has shaped the discipline’s core technical framework. He entered the field in the late 1990s, shifting focus from particle physics and cosmology — areas in which he was already known — to quantum information. That transition allowed him to bring deep theoretical training to bear on a set of problems that would prove central to the discipline’s development. Preskill’s accolades reflect the weight of his work: He received the Dirac Medal in 2019 and is a member of the National Academy of Sciences.
The NISQ Era and the Long Road
In 2018, Preskill published a paper titled “Quantum Computing in the NISQ Era.” The term NISQ stands for “noisy intermediate-scale quantum,” and the paper addressed the imperfect yet capable devices of the near future. His framing acknowledged that today’s quantum machines are error-prone and limited in scale, but still capable of performing specialized tasks that no conventional computer can match within practical timeframes. Inside the IQIM, research continues on multiple fronts: developing better qubits, designing more efficient error-correcting codes, and creating algorithms tailored to the NISQ devices that exist today. The central question now is how quickly the field can move from demonstrating supremacy on a single contrived problem to achieving supremacy on calculations that matter in the real world — a simulation of a new molecule, a breakthrough in cryptography, or a computation in materials science. Preskill’s own work suggests the path is long, but he also emphasizes that the path is no longer hypothetical. The devices are here; the noise is real; and the race is on.
Background and Why It Matters
Quantum computing emerged from decades of theoretical work in physics and computer science, with early ideas first proposed in the early 1980s. Early researchers explored how quantum mechanics — long confined to textbooks — could be harnessed to process information in ways classical machines cannot. The stakes are both technical and economic: breakthroughs in quantum computing could reshape cryptography, materials science, and the optimization problems that underpin industries from finance to pharmaceuticals. Preskill’s leadership at Caltech’s IQIM has helped anchor academic inquiry amid growing commercial and governmental interest in the field. His own intellectual lineage — a Harvard Ph.D., then a path that led him to Caltech, where he built the IQIM from the ground up — places him at the center of a broader shift from pure theory to engineering with real-world consequences. Whether or not the next quantum machine crosses the supremacy line, the field’s trajectory reflects a fundamental change in how scientists and engineers think about computation itself.
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