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What is quantum computing?
6 cited papers · March 22, 2026 · Powered by Researchly AI
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TL;DR
Quantum computing is a fundamentally new paradigm of computation that leverages the principles of quantum mechanics to process information in ways that classica…
Quantum computing is a fundamentally new paradigm of computation that leverages the principles of quantum mechanics to process information in ways that classical computers cannot.12Gill et al. (2024) describe how quantum computing uses entanglement, superposition, and other quantum mechanical concepts to provide substantial processing advantages over traditional computing, enabling solutions to complex problems in fields such as drug design, logistics, cryptography, and sustainable energy.1
- Qubit — The fundamental unit of quantum computation, replacing the classical bit. Unlike a classical bit, a qubit exploits quantum mechanical properties to represent and process information in new ways.
- Superposition & Entanglement — Core quantum phenomena that enable quantum computers to explore vast computational spaces simultaneously.
- Quantum Gates & Circuits — Sequences of quantum gates that manipulate quantum states form the basis of quantum algorithms.
- NISQ Devices — Noisy Intermediate-Scale Quantum devices with 50–100 qubits represent the current technological frontier.
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Quantum Circuit Ansatz: Patterns of Abstraction and Reuse of Quantum Algorithm DesignXiaoyu Guo, Takahiro Muta et al.20242024 IEEE International Conference on Quantum Software (QSW)
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Diagram
Classical Input | v +------------------+ | Quantum Circuit | | (Quantum Gates) | | [Qubit Register]| +------------------+ | v Measurement | v Classical Output
Quantum computing differs fundamentally from classical computing not merely in hardware substrate but in the very notion of computation itself.1The physical implementation of quantum computation requires satisfying specific criteria — DiVincenzo (2000) outlines five core requirements for physical implementation, explored across platforms including atomic physics, superconducting electronics, and quantum-dot physics.2Among hardware platforms, superconducting qubits are leading candidates; Kjaergaard et al. (2019) report demonstrations of high-fidelity two-qubit gates and early NISQ algorithm implementations using this modality.3
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Current quantum computers operate in the NISQ era, where noise in quantum gates limits the size and reliability of executable quantum circuits.1
Full fault-tolerant quantum computing remains a longer-term goal, and a 100-qubit quantum computer is not expected to transform industry immediately.
- Quantum computing uses superposition, entanglement, and other quantum principles to tackle problems intractable for classical computers.
- The qubit replaces the classical bit as the fundamental unit of computation, changing the very notion of what computation means.
- Superconducting qubits are among the most promising hardware platforms for scaling toward fault-tolerant quantum computers.
- NISQ-era devices are useful for exploring quantum physics and early algorithms, but fully error-corrected quantum computing remains a future milestone.
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Superconducting Qubits: Current State of PlayMorten Kjaergaard, Mollie E. Schwartz et al.2019Annual Review of Condensed Matter Physics
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- "Quantum error correction techniques for fault-tolerant quantum computing"
- "Applications of quantum algorithms in cryptography and drug discovery"
- "Comparison of quantum hardware platforms: superconducting qubits vs trapped ions vs photonic qubits"
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