Abstract
A new type of uncertainty relation is presented, concerning the information-bearing properties of a discrete quantum system. A natural link is then revealed between basic quantum theory and the linear error correcting codes of classical information theory. A subset of the known codes is described, having properties which are important for error correction in quantum communication. It is shown that a pair of states which are, in a certain sense, “macroscopically different,” can form a superposition in which the interference phase between the two parts is measurable. This provides a highly stabilized “Schrödinger cat” state.
- Received 4 October 1995
DOI:https://doi.org/10.1103/PhysRevLett.77.793
©1996 American Physical Society
Focus
FocusLandmarks—Correcting Quantum Computer Errors
Published 10 June 2016
In the mid-1990s, researchers proposed methods to preserve the integrity of quantum bits—techniques that may become the key to practical quantum computing on a large scale.
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