|October 27/November 3, 2008|
Transfer a quantum bit from an electron to
the nucleus of a phosphorous atom and back and you have the building block
of a quantum computer memory chip.
A combination of microwaves and radio waves transfers information from an easily controlled but short-lived electron quantum bit to a phosphorous nucleus embedded in a silicon chip. The information lasts for more than a second -- a longtime for quantum computing -- and can be transferred back to the electron.
The technique brings chip-based quantum computers a step closer. Quantum computers have the potential to crack today's security codes and carry other tasks beyond the reach of today's computers.
Solid-State Quantum Memory Using the 31P Nuclear Spin
Nature, October 23, 2008
John J. L. Morton
Richard M. Brown
Brendon W. Lovett
Eugene E. Haller
Joel W. Ager
S. A. Lyon
Related stories and briefs:
Positioned atoms advance quantum chips -- precursor research
How It Works -- Quantum computing: qubits -- overview of quantum bits
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