Effects of Loss and Decoherence on a Simple Quantum Computer

Details Effects of Loss and Decoherence on a Simple Quantum Computer Effects of Loss and Decoherence on a Simple Quantum Computer

1996-02-27

arxiv.org/abs/quant-ph/9602018v1

Physics

Quantum Physics

6 pages, revtex, figures also available at http://feynman.stanford.edu/qcomp/

Scientific paper

We investigate the impact of loss (amplitude damping) and decoherence (phase damping) on the performance of a simple quantum computer which solves the one-bit Deutsch problem. The components of this machine are beamsplitters and nonlinear optical Kerr cells, but errors primarily originate from the latter. We develop models to describe the effect of these errors on a quantum optical Fredkin gate. The results are used to analyze possible error correction strategies in a complete quantum computer. We find that errors due to loss can be avoided perfectly by appropriate design techniques, while decoherence can be partially dealt with using projective error correction.

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