Using weak nonlinearity under decoherence for macroscopic-entanglement generation and quantum computation

Details Using weak nonlinearity under decoherence for macroscopic-entanglement generation and quantum computation Using weak nonlinearity under decoherence for macroscopic-entanglement generation and quantum computation

2005-07-11

arxiv.org/abs/quant-ph/0507095v3

Phys. Rev. A 72, 034305 (2005)

Physics

Quantum Physics

references added, minor typos corrected

Scientific paper

10.1103/PhysRevA.72.034305

Recently, there have been several suggestions that weak Kerr nonlinearity can be used for generation of macroscopic superpositions and entanglement and for linear optics quantum computation. However, it is not immediately clear that this approach can overcome decoherence effects. Our numerical study in this paper shows that nonlinearity of weak strength could be useful for macroscopic entanglement generation and quantum gate operations in the presence of decoherence. We suggest specific values for real experiments based on our analysis. Our discussion shows that the generation of macroscopic entanglement using this approach is within reach of current technology.

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