Quantum Computing 

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Latest news on quantum computing, covering quantum computers, qubits, quantum chips, quantum computation, quantum supremacy and quantum advantage, plus error correction, quantum algorithms, quantum software, quantum hardware, quantum processors and quantum gates, and companies such as IBM, Google, IonQ, D-Wave, Rigetti, Quantinuum, PsiQuantum, Xanadu and Infleqtion.

A quantum computer stores information in qubits, or quantum bits. A single qubit (quantum bit) can sit in superposition, and entanglement links qubits together. This lets quantum computation tackle problems such as simulating molecules or breaking certain codes in ways classical machines cannot.

The race spans technology giants and specialists. IBM and Google build superconducting machines, IonQ and Quantinuum use trapped ions, and PsiQuantum and Xanadu pursue photonics. D-Wave focuses on quantum annealing, while Rigetti, IQM, Pasqal, QuEra and Infleqtion add further hardware approaches. Software firms such as Classiq build tools for designing quantum algorithms.

The central challenge is error correction. Qubits are fragile, so engineers combine many physical qubits into one logical qubit, and progress in quantum gates and fidelity brings fault-tolerant machines closer. Claims of quantum supremacy or quantum advantage are debated, since classical computers keep improving.

Quantum computers also raise security questions. A large fault-tolerant machine running Shor's algorithm could break widely used public-key encryption, so governments and companies are adopting post-quantum cryptography, including NIST standards published in 2024.

The idea dates back to 1981, when Richard Feynman argued that simulating nature needs computers built on quantum rules. Peter Shor's 1994 algorithm and Lov Grover's 1996 search algorithm showed what such machines could do, and Google's 2019 Sycamore experiment claimed quantum supremacy. Universities, startups and governments now fund research and national strategies, and investors follow quantum stocks closely.

Our NewsNow quantum computing feed gathers headlines from reliable sources on quantum computers, qubits, quantum chips, error correction, quantum software, post-quantum security and the companies building them. Follow it for constantly updated coverage of funding, partnerships, breakthroughs and the debate over quantum advantage.