Communications of the ACM
Quantum Communication Controlled By Resonance in 'artificial Atoms'
A new method for controlling a quantum bit for electronic quantum communication controls electrons in a series of quantum dots.
Credit: University of Copenhagen
Researchers from Denmark, the United States, and Australia have described a method to control a quantum bit for electronic quantum communication in a series of quantum dots.
Although quantum machines allow computing's 0 and 1 bits of data to exist simultaneously, enabling tremendous computing power, these states cannot be measured.
"We have developed a new way of controlling the electrons so that the quantum state can be controlled without measurement, using resonances familiar in atomic physics, now applied to these artificial atoms," says Charles Marcus, director of the Center for Quantum Devices at the University of Copenhagen's Niels Bohr Institute.
The researchers capture the electrons in a box comprised of a quantum dot, which is an artificial atom. "The quantum dots are embedded in the semiconductor and each quantum dot can capture one electron," Marcus says. "There needs to be three quantum dots next to each other using nanometer-scale electrostatic metal gates...the three boxes together form a single entity--a qubit or quantum bit."
An electrical signal then opens the boxes rapidly, causing the system to move in dynamic vibrations and allowing the researchers to change the quantum state of the electrons.
From University of Copenhagen
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