Communications of the ACM
Colors From Darkness: Researchers Develop Alternative Approach to Quantum Computing
Researchers at Finland's Aalto University have demonstrated how microwave signals may be used in the coding of information for quantum computing.
Credit: Antti Paraoanu
Aalto University researchers in Finland have demonstrated the suitability of microwave signals in the coding of information for quantum computing.
The researchers used a microwave resonator based on extremely sensitive measurement devices called superconductive quantum interference devices. They cooled the resonator down to near absolute zero, a state that corresponds to perfect darkness where no photon is present. However, the researchers note in this state, which is also called a quantum vacuum, there exist fluctuations that bring photons in and out of existence for a very short time. The researchers were able to convert these fluctuations into real photons of microwave radiation with different frequencies, and found these photons are correlated with each other.
"The photons at different frequencies will play a similar role to the registers in classical computers, and logical gate operations can be performed between them," says Aalto researcher Sorin Paraoanu.
The researchers say by utilizing the multi-frequency microwave signals, an alternative approach to quantum computing can be pursued that realizes the logical gates by sequences of quantum measurements.
From Aalto University
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