RT Journal Article
SR Electronic
T1 Reliable quantum computers
JF Proceedings of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences
FD The Royal Society
SP 385
OP 410
DO 10.1098/rspa.1998.0167
VO 454
IS 1969
A1 Preskill, John
YR 1998
UL http://rspa.royalsocietypublishing.org/content/454/1969/385.abstract
AB The new field of quantum error correction has developed spectacularly since its origin less than two years ago. Encoded quantum information can be protected from errors that arise due to uncontrolled interactions with the environment. Recovery from errors can work effectively even if occasional mistakes occur during the recovery procedure. Furthermore, encoded quantum information can be processed without serious propagation of errors. Hence, an arbitrarily long quantum computation can be performed reliably, provided that the average probability of error per quantum gate is less than a certain critical value, the accuracy threshold. A quantum computer storing about 106 qubits, with a probability of error per quantum gate of order 10â€“6, would be a formidable factoring engine. Even a smaller lessâ€“accurate quantum computer would be able to perform many useful tasks. This paper is based on a talk presented at the ITP Conference on Quantum Coherence and Decoherence, 15 to 18 December 1996.