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A logical qubit specifies how a single qubit should behave in a quantum algorithm, subject to quantum logic operations which can be built out of quantum logic gates. However, issues in current technologies preclude single two-state quantum systems , which can be used as physical qubits, from reliably encoding and retaining this information for ...
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.
An n-qubit (reversible) quantum gate is a unitary mapping U from the space H QB(n) of n-qubit registers onto itself. Typically, we are only interested in gates for small values of n . A reversible n -bit classical logic gate gives rise to a reversible n -bit quantum gate as follows: to each reversible n -bit logic gate f corresponds a quantum ...
An example is a qubit used in quantum information processing. A qubit state is most generally a superposition of the basis states | 0 {\displaystyle |0\rangle } and | 1 {\displaystyle |1\rangle } :
A quantum bus for superconducting qubits can be built with a resonance cavity.The hamiltonian for a system with qubit A, qubit B, and the resonance cavity or quantum bus connecting the two is ^ = ^ + =, ^ + =, (^ † ^ + ^ ^ +) where ^ = ^ + ^ is the single qubit hamiltonian, ^ + ^ is the raising or lowering operator for creating or destroying excitations in the th qubit, and is controlled by ...
Example: The qubit is measured, and the result of this measurement is a Boolean value, which is consumed by the classical computer. If ϕ {\displaystyle \phi } measures to 1, then the classical computer tells the quantum computer to apply the U gate on ψ {\displaystyle \psi } .
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