Quantum Mechanical Bit

AKA: qubit.
Context:
- It can be put into a State of Quantum Superposition.
- It can be converted Digital Bits by ending the Quantum State.
- It can be arranged to collapse into an Answer State.
- It can have an Error Rate.
- It can be a component of a Quantum Computer.
- …
Counter-Example(s):
- a Digital Bit.
See: Quantum Computing, Quantum Information, Bit, Two-State Quantum System, Photon Polarization, Photon, Stabilizer Code.

References

https://www.bbvaopenmind.com/en/quantum-computing/
- QUOTE: The two most relevant aspects of quantum physics are the principles of superposition and entanglement.
  - Superposition: Think of a qubit as an electron in a magnetic field. The electron’s spin may be either in alignment with the field, which is known as a spin-up state, or opposite to the field, which is known as a spin-down state. According to quantum law, the particle enters a superposition of states, in which it behaves as if it were in both states simultaneously. Each qubit utilized could take a superposition of both 0 and 1.
  - Entanglement: Particles that have interacted at some point retain a type of connection and can be entangled with each other in pairs, in a process known as correlation. Knowing the spin state of one entangled particle – up or down – allows one to know that the spin of its mate is in the opposite direction. Quantum entanglement allows qubits that are separated by incredible distances to interact with each other instantaneously (not limited to the speed of light). No matter how great the distance between the correlated particles, they will remain entangled as long as they are isolated.

(Wikipedia, 2014) ⇒ http://en.wikipedia.org/wiki/qubit Retrieved:2014-10-9.
- In quantum computing, a qubit () or quantum bit is a unit of quantum information — the quantum analogue of the classical bit. A qubit is a two-state quantum-mechanical system, such as the polarization of a single photon: here the two states are vertical polarization and horizontal polarization. In a classical system, a bit would have to be in one state or the other, but quantum mechanics allows the qubit to be in a superposition of both states at the same time, a property which is fundamental to quantum computing.