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  2. Qubit - Wikipedia

    en.wikipedia.org/wiki/Qubit

    There are two possible outcomes for the measurement of a qubit—usually taken to have the value "0" and "1", like a bit. However, whereas the state of a bit can only be binary (either 0 or 1), the general state of a qubit according to quantum mechanics can arbitrarily be a coherent superposition of all computable states simultaneously. [2]

  3. 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]

  4. 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.

  5. Cubit - Wikipedia

    en.wikipedia.org/wiki/Cubit

    A royal cubit (gaz-i shāhī) appeared in the 17th century with 95 cm (37 + 12 in), while a "shortened" cubit (gaz-i mukassar) of 6.8 cm (2 + 11 ⁄ 16 in) (likely derived from the widely used cloth cubit of Aleppo) was used for cloth. [27] The measure survived into the 20th century, with 1 gaz equal to 104 cm (41 in). [27]

  6. Parity measurement - Wikipedia

    en.wikipedia.org/wiki/Parity_measurement

    A qubit is a two-level system, and when we measure one qubit, we can have either 1 or 0 as a result. One corresponds to odd parity, and zero corresponds to even parity. This is what a parity check is. This idea can be generalized beyond single qubits. This can be generalized beyond a single qubit and it is useful in QEC.

  7. 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]

  8. Controlled NOT gate - Wikipedia

    en.wikipedia.org/wiki/Controlled_NOT_gate

    In addition to a regular controlled NOT gate, one could construct a function-controlled NOT gate, which accepts an arbitrary number n+1 of qubits as input, where n+1 is greater than or equal to 2 (a quantum register). This gate flips the last qubit of the register if and only if a built-in function, with the first n qubits as input, returns a 1.

  9. Deferred measurement principle - Wikipedia

    en.wikipedia.org/wiki/Deferred_measurement_principle

    The classical bits control if the 1-qubit X and Z gates are executed, allowing teleportation. [ 1 ] By moving the measurement to the end, the 2-qubit controlled -X and -Z gates need to be applied, which requires both qubits to be near (i.e. at a distance where 2-qubit quantum effects can be controlled), and thus limits the distance of the ...