Xanadu

IBM operates the world's largest fleet of cloud-accessible quantum systems through the IBM Quantum Network, serving over 300 organizations. Its superconducting qubit roadmap has progressed from the 127-qubit Eagle (2021) through the 1,121-qubit Condor to the current 156-qubit Heron processor, which achieved a 16x performance improvement over 2022 systems. IBM's open-source Qiskit SDK is the most widely used quantum programming framework globally. The company targets a 200-logical-qubit system (Starling) by 2028 using LDPC codes that it claims require 90% fewer physical qubits than surface codes.

Google Quantum AI operates from Santa Barbara, California. In late 2024, its Willow chip demonstrated below-threshold quantum error correction for the first time — the most significant QEC milestone to date. In October 2025, Google acquired MIT-founded Atlantic Quantum, adding its modular superconducting chip stack (co-located qubits and cryogenic control electronics) to accelerate scaling toward large-scale error-corrected systems. Google's open-source Cirq framework is widely used for circuit-level quantum programming.

Formed from the 2021 merger of Honeywell Quantum Solutions and Cambridge Quantum Computing, Quantinuum leads the world in logical qubit count and trapped-ion fidelity. Its Helios system (launched November 2025) offers 98 physical and 48 logical qubits using barium atoms, and is available via cloud and on-premises installation. Early users include JPMorgan Chase, SoftBank, Amgen, and BMW. Quantinuum was valued at $10 billion as of 2025 and is backed by Honeywell, which retains majority ownership. It also develops TKET, a widely-used open-source quantum compiler.

D-Wave is the pioneer and sole commercial provider of quantum annealing systems, with over 25 years of operation. Its Advantage system features 5,000+ qubits optimized for combinatorial optimization problems. D-Wave also offers the Leap cloud platform with hybrid classical-quantum solvers. The company is developing gate-based quantum computing alongside its annealing business and launched the Quantum LaunchPad program in 2025 to accelerate commercial deployment. D-Wave has customers across logistics, manufacturing, and financial services. In January 2026, D-Wave acquired Quantum Computing Inc. (QCi, NASDAQ: QUBT) for approximately $550 million, expanding its quantum optimization portfolio to include room-temperature photonic hardware.