Quantum measurement of a mesoscopic spin ensemble

Details Quantum measurement of a mesoscopic spin ensemble Quantum measurement of a mesoscopic spin ensemble

2005-08-19

arxiv.org/abs/quant-ph/0508144v3

Phys. Rev. A 74, 032316 (2006)

Physics

Quantum Physics

8 pages, 2 figures; minor changes, published version

Scientific paper

10.1103/PhysRevA.74.032316

We describe a method for precise estimation of the polarization of a mesoscopic spin ensemble by using its coupling to a single two-level system. Our approach requires a minimal number of measurements on the two-level system for a given measurement precision. We consider the application of this method to the case of nuclear spin ensemble defined by a single electron-charged quantum dot: we show that decreasing the electron spin dephasing due to nuclei and increasing the fidelity of nuclear-spin-based quantum memory could be within the reach of present day experiments.

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