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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.
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 ...
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 ...
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 } .
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.
English. Read; Edit; View history; Tools. Tools. ... Examples: The quantum state vector of a 5-qubit register is a unit vector in =. ...
This difference is, for example, illustrated by the following interesting property of the W state: if one of the three qubits is lost, the state of the remaining 2-qubit system is still entangled. This robustness of W-type entanglement contrasts strongly with the GHZ state, which is fully separable after loss of one qubit.
For the tangle, there is monogamy of entanglement, [9] [10] that is, the tangle of a qubit with the rest of the system cannot ever exceed the sum of the tangles of qubit pairs which it is part of. References