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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 qubit is a two-state (or two-level) quantum-mechanical system , one of the simplest quantum systems displaying the peculiarity of quantum mechanics.
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 ...
The basic unit of information in quantum computing, the qubit (or "quantum bit"), serves the same function as the bit in classical computing. However, unlike a classical bit, which can be in one of two states (a binary ), a qubit can exist in a superposition of its two "basis" states, a state that is in an abstract sense "between" the two basis ...
Download QR code; Print/export ... Examples: The quantum state vector of a 5-qubit register is a unit vector in =. ...
Molecule of alanine used in NMR implementation of quantum computing. Qubits are implemented by spin states of the black carbon atoms. Nuclear magnetic resonance quantum computing (NMRQC) [1] is one of the several proposed approaches for constructing a quantum computer, that uses the spin states of nuclei within molecules as qubits.
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 ...
Global single qubit gates on all the atoms can be done either by applying a microwave field for qubits encoded in the Hyperfine manifold such as Rb and Cs or by applying an RF magnetic field for qubits encoded in the nuclear spin such as Yb and Sr. Focused laser beams can be used to do single-site one qubit rotation using a lambda-type three level Raman scheme (see figure).
Here are some examples of one-dimensional cluster states (d=1), for =,,, where is the number of qubits. We take κ a = 0 {\displaystyle \kappa _{a}=0} for all a {\displaystyle a} , which means the cluster state is the unique simultaneous eigenstate that has corresponding eigenvalue 1 under all correlation operators.
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