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wilber_xbox
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re: Researchers report solid-state quantum leaps
wilber_xbox   6/28/2012 1:45:21 PM
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"using laser light to encode the spin-state of atomic nuclei on gallium arsenide chips", i wonder how they achieve this using laser. Is there any link to the paper? I know the conventional approach of encoding the spin on electrons.

R_Colin_Johnson
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re: Researchers report solid-state quantum leaps
R_Colin_Johnson   6/28/2012 4:33:37 PM
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Here are the details that the authors give in their abstract: "We show that, by exploiting different mechanisms for electron–nuclear interaction in the optical pumping process, we are able to control and image the sign of the nuclear polarization as a function of distance from an irradiated GaAs surface. This control is achieved using a crafted combination of light helicity, intensity and wavelength, and is further tuned via use of NMR pulse sequences. These results demonstrate all-optical creation of micron scale, rewritable patterns of positive and negative nuclear polarization in a bulk semiconductor without the need for ferromagnets, lithographic patterning techniques, or quantum-confined structures." http://www.nature.com/ncomms/journal/v3/n6/full/ncomms1918.html

wilber_xbox
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re: Researchers report solid-state quantum leaps
wilber_xbox   6/30/2012 6:41:38 AM
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Thanks for the link, didn't understand much from the abstract so need to read the paper.

Kinnar
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re: Researchers report solid-state quantum leaps
Kinnar   6/28/2012 6:20:26 PM
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These are the researches that will select the directions for quantum computing, being at very early stage.

green_is_now
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re: Researchers report solid-state quantum leaps
green_is_now   12/13/2012 2:20:30 AM
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So optical waveguides, mems mirrors, memory-material targets, and lazers need to be integrated into IC's for this to happen.



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