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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.
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 ...
Download QR code; Print/export ... Examples: The quantum state vector of a 5-qubit register is a unit vector in =. ...
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 ...
Unlike classical digital states (which are discrete), a qubit is continuous-valued, describable by a direction on the Bloch sphere. Despite being continuously valued in this way, a qubit is the smallest possible unit of quantum information, and despite the qubit state being continuous-valued, it is impossible to measure the value precisely ...
Qubit 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 qubit is a two-state (or two-level) quantum-mechanical system, one of the simplest 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 following example demonstrates the implementation of a Bell state using Ket: from ket import * a , b = quant ( 2 ) # Allocate two quantum bits H ( a ) # Put qubit `a` in a superposition cnot ( a , b ) # Entangle the two qubits in the Bell state m_a = measure ( a ) # Measure qubit `a`, collapsing qubit `b` as well m_b = measure ( b ...
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