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Nanotechnology: Quantum Computer May Be Closer With Extended Quantum Lifetime Of Electrons

Date:
November 17, 2008
Source:
University College London - UCL
Summary:
Physicists have found a way to extend the quantum lifetime of electrons by more than 5,000 per cent. Electrons exhibit a property called 'spin' and work like tiny magnets which can point up, down or a quantum superposition of both. The state of the spin can be used to store information and so by extending their life the research provides a significant step towards building a usable quantum computer.
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Microwaves are used to control the spin state of electrons held in silicon. This spin state can be watched in real time by measuring the electric current flowing between the (grey) electrodes.
Credit: Image courtesy UCL

Physicists in the USA and at the London Centre for Nanotechnology have found a way to extend the quantum lifetime of electrons by more than 5,000 per cent, as reported recently in Physical Review Letters. Electrons exhibit a property called ‘spin’ and work like tiny magnets which can point up, down or a quantum superposition of both.

The state of the spin can be used to store information and so by extending their life the research provides a significant step towards building a usable quantum computer.

“Silicon has dominated the computing industry for decades,” says Dr Gavin Morley, lead author of the paper. “The most sensitive way to see the quantum behaviour of electrons held in silicon chips uses electrical currents. Unfortunately, the problem has always been that these currents damage the quantum features under study, degrading their usefulness.”

Marshall Stoneham, Professor of Physics at UCL (University College London), commented: “Getting the answer from a quantum computation isn't easy. This new work takes us closer to solving the problem by showing how we might read out the state of electron spins in a silicon-based quantum computer.”

To achieve the record quantum lifetime the team used a magnetic field twenty-five times stronger than those used in previous experiments. This powerful field also provided an additional advantage in the quest for practical quantum computing: it put the electron spins into a convenient starting state by aligning them all in one direction.

For more information, see the paper published in Physical Review Letters, November 14 2008, by G. W. Morley (London Center for Nanotechnology), D. R. McCamey (University of Utah), H. A. Seipel (University of Utah), L.-C. Brunel (National High Magnetic field Laboratory), J. van Tol (National High Magnetic field Laboratory) and C. Boehme (University of Utah).


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The above post is reprinted from materials provided by University College London - UCL. Note: Materials may be edited for content and length.


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University College London - UCL. "Nanotechnology: Quantum Computer May Be Closer With Extended Quantum Lifetime Of Electrons." ScienceDaily. ScienceDaily, 17 November 2008. <www.sciencedaily.com/releases/2008/11/081114081220.htm>.
University College London - UCL. (2008, November 17). Nanotechnology: Quantum Computer May Be Closer With Extended Quantum Lifetime Of Electrons. ScienceDaily. Retrieved September 4, 2015 from www.sciencedaily.com/releases/2008/11/081114081220.htm
University College London - UCL. "Nanotechnology: Quantum Computer May Be Closer With Extended Quantum Lifetime Of Electrons." ScienceDaily. www.sciencedaily.com/releases/2008/11/081114081220.htm (accessed September 4, 2015).

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