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  2. Qubit - Wikipedia

    en.wikipedia.org/wiki/Qubit

    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.

  3. One-way quantum computer - Wikipedia

    en.wikipedia.org/wiki/One-way_quantum_computer

    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.

  4. Quantum logic gate - Wikipedia

    en.wikipedia.org/wiki/Quantum_logic_gate

    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.

  5. List of quantum logic gates - Wikipedia

    en.wikipedia.org/wiki/List_of_quantum_logic_gates

    The qubit-qubit Ising coupling or Heisenberg interaction gates R xx, R yy and R zz are 2-qubit gates that are implemented natively in some trapped-ion quantum computers, using for example the Mølmer–Sørensen gate procedure. [17] [18]

  6. Physical and logical qubits - Wikipedia

    en.wikipedia.org/wiki/Physical_and_logical_qubits

    [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]

  7. List of quantum processors - Wikipedia

    en.wikipedia.org/wiki/List_of_quantum_processors

    99.98 (1 qubit) 98.5–99.3 (2 qubit) [30] 99.56 ((SPAM) 36 [29] (earlier 32) 2022: IQM -Superconducting: Star: 99.91 (1 qubit) 99.14 (2 qubits) 5 [31] November 30, 2021 [32] N/A IQM -Superconducting: Square lattice 99.91 (1 qubit median) 99.944 (1 qubit max) 98.25 (2 qubits median) 99.1 (2 qubits max) 20 October 9, 2023 [33] 16 [34] M Squared ...

  8. Quantum computing - Wikipedia

    en.wikipedia.org/wiki/Quantum_computing

    In general, the vector space for an n-qubit system is 2 n-dimensional, and this makes it challenging for a classical computer to simulate a quantum one: representing a 100-qubit system requires storing 2 100 classical values.

  9. Quantum circuit - Wikipedia

    en.wikipedia.org/wiki/Quantum_circuit

    A reversible gate is a reversible function on n-bit data that returns n-bit data, where an n-bit data is a string of bits x 1,x 2, ...,x n of length n. The set of n-bit data is the space {0,1} n, which consists of 2 n strings of 0's and 1's. More precisely: an n-bit reversible gate is a bijective mapping f from the set {0,1} n of n-bit data ...