Active stabilisation, quantum computation and quantum state synthesis

Details Active stabilisation, quantum computation and quantum state synthesis Active stabilisation, quantum computation and quantum state synthesis

1996-11-16

arxiv.org/abs/quant-ph/9611027v1

Phys.Rev.Lett.78:2252-2255,1997

Physics

Quantum Physics

8 pages LaTeX plus 4 figures. Submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.78.2252

Active stabilisation of a quantum system is the active suppression of noise (such as decoherence) in the system, without disrupting its unitary evolution. Quantum error correction suggests the possibility of achieving this, but only if the recovery network can suppress more noise than it introduces. A general method of constructing such networks is proposed, which gives a substantial improvement over previous fault tolerant designs. The construction permits quantum error correction to be understood as essentially quantum state synthesis. An approximate analysis implies that algorithms involving very many computational steps on a quantum computer can thus be made possible.

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