Qubit Field Theory

A Qubit Field Theory is a quantum field theory in which the canonical commutation relations involved in the quantisation of pairs of observables are relaxed. Specifically it is a quantum field theory in which, unlike most other quantum field theories, the pair of observables is not required to always commute.

In many ordinary quantum field theories, constraining one observable to a fixed value results in the uncertainty of the other observable being infinite (c.f. Uncertainty Principle), and as a consequence there potentially being an infinite amount of information involved. In the situation of the standard position-momentum commutation (in which the Uncertainty Principle is most known), this implies that a fixed, finite, volume of space has an infinite capacity to store information. However, Bekenstein's bound hints that the information storage capacity ought to be finite, and so Qubit Field Theory seeks to resolve this issue by removing the commutation restriction in order to make the capacity to store information a finite value; hence the name "Qubit", which derives from "Quantum-bit" or "Quantised-bit".

David Deutsch has presented a group of "Qubit Field Theories" which, despite not requiring commutation of certain observables, still presents the same observable results as ordinary Quantum Field Theory.

External links

* [http://arxiv.org/abs/quant-ph/0401024 Qubit Field Theory] by David Deutsch