Error Correcting Codes in Quantum Theory
- Clarendon Laboratory, Parks Road, Oxford, OX1 3PU (England)
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, {open_quote}{open_quote}macroscopically different,{close_quote}{close_quote} can form a superposition in which the interference phase between the two parts is measurable. This provides a highly stabilized {open_quote}{open_quote}Schr{umlt o}dinger cat{close_quote}{close_quote} state. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 286763
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 5 Vol. 77; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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