IBM Quantum System One

IBM Quantum System One is a complete quantum-computing installation, not merely a chip. Its central processor uses superconducting qubits, which must be cooled to near absolute zero so that electrical circuits exhibit quantum behavior. A cryogenic enclosure, microwave-control wiring, signal-processing equipment, vibration isolation, and electromagnetic shielding are integrated into a compact architectural system.

The original System One contained a 20-qubit processor and was presented in 2019 as the first IBM quantum system engineered for commercial use. Its glass-enclosed structure was intended to stabilize the machine and make access, maintenance, and observation more practical than in a purely experimental setup. The enclosure is therefore functional as well as symbolic: thermal leakage, vibration, and electromagnetic interference can all degrade qubit performance.

System One installations have served as institutional quantum-computing resources whose processors can be upgraded over time. IBM and the Cleveland Clinic announced a dedicated System One in 2021 as part of a collaboration focused on biomedical and healthcare research; the installation became operational with a newer IBM processor rather than remaining limited to the original 20-qubit generation.

The same product concept has appeared in collaborations involving universities, national laboratories, and research organizations, including the University of Tokyo. Later IBM processors such as IBM Eagle increased qubit counts and introduced packaging and control changes, but larger count alone does not define a System One. The broader objective is repeatable, serviceable deployment of quantum hardware alongside conventional computing and research infrastructure.¹

System One runs quantum circuits by sending precisely timed microwave pulses to superconducting qubits and then measuring the resulting states. The processor is suspended inside a dilution refrigerator, where successive cooling stages reduce thermal noise to millikelvin temperatures; room-temperature electronics coordinate calibration, control, and readout.²

Users generally access the hardware remotely through IBM’s cloud services rather than entering the machine room. Performance is assessed with measures such as error rates, circuit depth, and quantum volume, which combines several aspects of usable computational capability rather than counting qubits alone. System One is therefore best understood as an engineered stack: the processor, refrigeration, control system, software interface, and operational procedures must work together.

The distinctive glass cabinet is not the quantum processor itself; it surrounds and organizes the supporting infrastructure. The visually prominent enclosure helps separate the controlled interior from the surrounding room, while the refrigerator and cabling inside perform the technically essential work.

System One also illustrates why quantum-computing progress is not measured by qubit count alone. Superconducting qubits are vulnerable to decoherence, control imperfections, crosstalk, and readout errors, and useful algorithms require these problems to be reduced through calibration, improved device design, and eventually quantum error correction. The machine is consequently a platform for experimentation as much as a finished-purpose computer: researchers use it to study chemistry, optimization, machine learning, and the engineering requirements of scalable fault-tolerant systems.

Superconducting qubit

A quantum bit implemented with a superconducting electrical circuit operated at cryogenic temperature.

Dilution refrigerator

A cryogenic apparatus that uses a mixture of helium isotopes to reach temperatures of a few millikelvin.

Quantum volume

A benchmark that reflects usable quantum-circuit capability by combining processor size, fidelity, connectivity, and circuit performance.

Quantum error correction

Methods for protecting logical quantum information from physical noise by encoding it across multiple imperfect qubits.