Wednesday, April 1, 2009

New Step Towards Quantum Computers

The diagrams show how the spin "wavers" (oscillation shown at top) in relation to time following an alignment laser pulse. One oscillation period corresponds to one complete "waver" rotation. As anticipated, the strength (amplitude) of all red curves decreases with time. After 1.2 nanoseconds (ns) a laser control pulse is irradiated to suddenly change the alignment of the spin, indicated by the phase of blue and finally green curves: It is precisely the counter-phase to the black curve at the bottom, recorded without control pulse. Moreover this waver builds up in the counter-phase at 2.4 ns, so that the signal is particularly high here, significantly facilitating readout. (Credit: Image courtesy of Ruhr-Universitaet-Bochum)

From Science Daily:

ScienceDaily (Mar. 30, 2009) — The intrinsic rotation of electrons – the "spin" – is a promising property for future electronics devices. If use as an information carrier were possible, the processing power of electronic components would suddenly increase to a multiple of the present capacity.

In cooperation with colleagues from Dortmund, St. Petersburg and Washington, Ruhr-Universit├Ąt Bochum physicists have now succeeded in aligning electron spin, bringing it to a controlled "waver" and reading it out. The electron spin can also be realigned as required at any time using optical pulses.

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