Quantum Computing
Hardware platforms, error correction milestones, and which stocks are positioned for the quantum era.
Why This Sector Matters
Quantum computing is not a near-term threat to classical computing — but it is the next fundamental shift in processing capability. Fault-tolerant quantum computers, when achieved, will break current encryption, accelerate drug discovery, and optimise logistics at scales impossible today.
Key Sub-Themes
Hardware Platforms — Superconducting (IBM, Google, Rigetti), trapped-ion (IonQ, Quantinuum), photonic (PsiQuantum, Xanadu), and neutral atom (Atom Computing) approaches all have different qubit count, error rate, and temperature requirement profiles.
Error Correction — The single biggest barrier to useful quantum computing. Google’s 2024 Willow chip demonstrated below-threshold error correction for the first time — a landmark milestone. IBM targets 10,000+ logical qubits by 2033.
NISQ Era vs Fault-Tolerant — We are currently in the Noisy Intermediate-Scale Quantum (NISQ) era. True commercial advantage requires fault-tolerant systems, likely 2030+.
Quantum Cryptography — A nearer-term commercial opportunity: quantum key distribution and post-quantum encryption standards (NIST finalised in 2024).
Listed Stocks
| Ticker | Company | Approach | Stage |
|---|---|---|---|
| IONQ | IonQ Inc. | Trapped-ion | Revenue |
| RGTI | Rigetti Computing | Superconducting | Pre-profit |
| QBTS | D-Wave Quantum | Annealing | Revenue |
| ARQQ | Arqit Quantum | Quantum cryptography | Revenue |
| QUBT | Quantum Computing Inc. | Photonic | Very early |
Deep Dive Articles — Coming Soon
Platform comparisons, milestone trackers, and investment frameworks for quantum stocks will appear here.