Communications of the ACM
Quantum Computer Cools Itself by Performing Calculations
Said researcher Rodolfo Soldati, “We tested and evaluated the performance of an algorithm, but by the performance standards of a refrigerator,” to assess how well it lowered the computer’s energy.
Credit: Durga Dasari/Institute of Physics at University of Stuttgart
A small diamond-based quantum computer developed by researchers at Germany's University of Stuttgart performs a sequence of mathematical operations to cool itself.
The computer is comprised of three qubits in a diamond that is missing two carbon atoms, one replaced with a nitrogen atom and the other by a vacancy.
The qubits were hit with microwaves, which altered the spin of either the nucleus of the nitrogen atom or the nuclei of the two carbon atoms near the vacancy.
Such manipulations of the qubits act as logic gates, with a sequence of gates used to change the computer's energy and cool it.
The researchers said this algorithmic cooling was very close to the theoretical limit of maximum cooling efficiency.
From New Scientist
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