Qubit Activity
| Background |
| In quantum computing, a qubit or quantum bit is the
basic unit of quantum information - the quantum version of the classical 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. Examples include: the spin of the electron in which the two levels can be taken as
spin up and spin down; or the polarization of a single photon in which the two states can be taken to be
the vertical polarization and the horizontal polarization. In a classical system, a bit would have to be in one state or the other. However, quantum mechanics allows the qubit to be in a coherent superposition of both states simultaneously, a property which is fundamental to both quantum mechanics and quantum computing. |
| Standard representation |
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Quantum logic gates, building blocks for a quantum circuit in a quantum computer, operate on one, two, or three qubits: mathematically, the qubits undergo a (reversible) unitary transformation under the quantum gate. For a single qubit, unitary transformations correspond to rotations of the qubit (unit) vector on the Bloch sphere to specific superpositions. For two qubits, the Controlled NOT gate can be used to entangle or disentangle them. |
| Qubit Game |
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Now for some fun 🤓 Questions? We would to hear from you. Please write in to ask@physics.im |
Last updated on 07/05/2020.