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The general definition of a qubit as the quantum state of a two-level quantum system.In quantum computing, a qubit (/ ˈ k juː b ɪ t /) or quantum bit is a basic unit of quantum information—the quantum version of the classic binary bit physically realized with a two-state device.
[1] [2] A logical qubit is a physical or abstract qubit that performs as specified in a quantum algorithm or quantum circuit [3] subject to unitary transformations, has a long enough coherence time to be usable by quantum logic gates (c.f. propagation delay for classical logic gates). [1] [4] [5]
The purpose of quantum computing focuses on building an information theory with the features of quantum mechanics: instead of encoding a binary unit of information (), which can be switched to 1 or 0, a quantum binary unit of information (qubit) can simultaneously turn to be 0 and 1 at the same time, thanks to the phenomenon called superposition.
99.944 (1 qubit max) 98.25 (2 qubits median) 99.1 (2 qubits max) 20 October 9, 2023 [33] 16 [34] M Squared Lasers: Maxwell Neutral atoms in optical lattices 99.5 (3-qubit gate), 99.1 (4-qubit gate) [35] 200 [36] November 2022: Oxford Quantum Circuits Lucy [37] Superconducting 8 2022: Oxford Quantum Circuits OQC Toshiko [38] Superconducting 32 ...
Industry research firm Fortune Business Insights projects the global quantum computing market will grow from $1.16 billion in 2024 to $12.6 billion by 2032, representing a 34.8% annual growth rate.
Just as the bit is the basic concept of classical information theory, the qubit is the fundamental unit of quantum information.The same term qubit is used to refer to an abstract mathematical model and to any physical system that is represented by that model.
Common quantum logic gates by name (including abbreviation), circuit form(s) and the corresponding unitary matrices. In quantum computing and specifically the quantum circuit model of computation, a quantum logic gate (or simply quantum gate) is a basic quantum circuit operating on a small number of qubits.
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