Quantum Computing

Quantum Computing Fundamentals – Multiple Qubits

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Book source: Quantum Computation and Quantum Information by Michael A. Nielsen and Isaac L. Chuang Similar to classical qubits, 2 qubit systems have 4 computational basis states. One of the important state is Bell State. Correlation in measurements of qubits in bell state.

Quantum Computing Fundamentals – Qubits

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Source book: Quantum Computation and Quantum Information, Michael A. Neilsen and Isaac L. Chuang Analogy between classical bit and quantum bit (qubit).Classical bit has 0 or 1 value whereas qubit can have state $|0\rangle$ or $|1\rangle$ along with linear combination ot those states (superposition). While classical bit can be measured deterministically with value either 0 ... Read More

Quantum Computing – Fundamental Concepts

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Nielsen, M. A., & Chuang, I. L. (2010). Quantum computation and quantum information. Cambridge university press. Key events in the field of quantum computation are, occurance of various crises in physics such as “ultraviolet catastrophe” in twentieth century with modern theory of quantum quantum mechanics starting in 1920s. Various other crucial algorithms are no-cloning theorem, Turing ... Read More

Quantum Computing – Notations and Terms

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Nielsen, M. A., & Chuang, I. L. (2010). Quantum computation and quantum information. Cambridge university press. Linear Algebra plays crucial part in understanding and representing quantum computing concepts. Some of the most frequent used quantum gates are hadamard, pauli X, Y, Z, etc.

News – Google’s Quantum Advantage Oct 23 2025

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A verifiable quantum advantage https://research.google/blog/a-verifiable-quantum-a dvantagehttps://www.theguardian.com/technology/2025/oct/22/google-hails-breakthrough-as-quantum-computer-surpasses-ability-of-supercomputersGoogle unveils quantum computing breakthrough on Willow chiphttps://www.afr.com/technology/google-unveils-quantum-computing-breakthrough-on-willow-chip-20251023-p5n4m8Google claims ‘quantum advantage’ again — but researchers are scepticalhttps://www.nature.com/articles/d41586-025-03300-4Observation of constructive interference at the edge of quantum ergodicityhttps://www.nature.com/articles/s41586-025-09526-6 Key Claims: D. A. Abanin, “Observation of constructive interference at the edge of quantum ergodicity”.

Quantum Computing – Gates Basics

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C. P. Williams, Explorations in Quantum Computing. in Texts in Computer Science. London: Springer, 2011. doi: 10.1007/978-1-84628-887-6. Defining a unitary matrix, where $U^{-1} = U^\dagger $ (inverse equals its conjugate transpose). Pauli matrices: $1 = \begin{pmatrix} 1 & 0 \\ 0 & 1 \end{pmatrix}$ $X = \begin{pmatrix} 0 & 1 \\ 1 & 0 \end{pmatrix}$ ... Read More

Quantum Computing

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C. P. Williams, Explorations in Quantum Computing. in Texts in Computer Science. London: Springer, 2011. doi: 10.1007/978-1-84628-887-6.

Nobel Prize in Physics 2025 for Discoveries in Quantum Mechanics

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https://www.nobelprize.org/prizes/physics/2025/press-release https://www.abc.net.au/news/2025-10-07/scientists-physics-nobel-prize-quantum-mechanics-discovery/105863766 Quantum Mechanical Tunneling All Images are from: https://www.nobelprize.org/prizes/physics/2025/press-release/ “The illustrations are free to use for non-commercial purposes. Attribute ©Johan Jarnestad/The Royal Swedish Academy of Sciences” https://www.nobelprize.org/uploads/2025/10/popular-physicsprize2025-2.pdf https://www.nobelprize.org/uploads/2025/10/advanced-physicsprize2025.pdf
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