Quantum Computing: Qubits, Error Correction and 2025 Outlook
Why in the news
With 2025 designated the International Year of Quantum Science and Technology by the UN, governments and private firms are racing in quantum computing.
Key facts
- Uses qubits in superposition (0 and 1 together); classical machines use bits.
- Potential fields: medicine, chemistry, AI, materials, cryptography.
- Quantum supremacy: a quantum processor beating classical ones; shown by Google’s Willow chip in late 2024.
Qubit approaches
| Type | Players |
|---|---|
| Superconducting | IBM, Google, QuEra |
| Semiconductor | Intel, Diraq, SQC |
| Photonic | PsiQuantum, Xanadu |
Quality and errors
- Many low-quality qubits are useless; high-fidelity qubits are needed.
- Qubits are vulnerable to environmental noise, so quantum error correction is essential.
- Logical qubits pool several imperfect qubits to cancel errors.
- Google, QuEra, IBM and CSIRO announced error-correction progress in 2024.
- Only a few single logical qubits exist; the next step is a network of them.
Future applications
- Medicine: drug discovery and genetic disease research.
- AI and cybersecurity: stronger encryption, better AI decisions.
- Material science: new materials with novel properties.
2025 outlook
- Chips should scale to hold logical qubits and stable computing.
- Quantum software and algorithms will develop.
- Progress is needed together in hardware, fidelity, error correction and algorithms.
- A fully working quantum computer remains distant.
Exam angle
- Chip named: Willow (Google).
- Key terms: qubit, superposition, logical qubit.