Scientists develop new technique for more efficient quantum computing


Correlations between waves in atomic systems or spin coherences have a long lifespan at ultra-low temperatures, according to a new study by scientists who have developed a new technique to measure it, according to the Department of Science and Technology. According to the ministry, a system with long-lived spin consistency is a better resource than a quantum computer. It allows quantum operations and logic gates to be implemented more efficiently so that the system becomes a better quantum sensor compared to systems where coherence is short lived.

This newly explored property of low temperature atomic systems can be exploited for efficient quantum detection and quantum information processing for application in quantum computing and secure communication, the ministry said, adding that the newly discovered technique may help study the real-time dynamics of quantum technology. phenomena such as quantum phase transitions in a non-invasive manner. According to the ministry, spin is a fundamental quantum property of atoms and elementary particles such as electrons and protons. As atoms are cooled to lower temperatures, their quantum nature becomes more evident.

However, while the degree of spin freedom is a hotly debated topic, particularly in the context of quantum information processing, dynamic measurements on spins at ultra-low temperatures were not available. Indeed, most detection techniques in cold atom experiments are destructive and disrupt the atomic sample upon detection, the ministry said. A team of scientists from the Raman Research Institute in Bangalore, an independent institute of the Indian government’s Department of Science and Technology, measured the spin properties of atoms cooled to micro-Kelvin temperatures using the new method they devised. .

Quantum properties dominate daily classical observations at this temperature – very close to absolute zero, and it is for the first time that spin dynamics have been detected at this temperature regime using measurements of polarization fluctuation. With the new technique, scientists measured the properties of spins and the lifetime of an atomic spin state with a million-fold improvement in detection sensitivity over existing technology. They proved that the spin consistency at this low temperature has a long lifespan.

In this work led by Sanjukta Roy, Dibyendu Roy and Saptarishi Chaudhuri and co-authored by Ph.D. students Maheswar Swar and Subhajit Bhar from RRI increased the signal strength of spin noise by a million times using coherent laser control . They made the technique of spin noise spectroscopy usable for spectroscopist measurement systems where the signal level is too low to be detected. The research was published in the journal Phys. Rev. Research. The work was financially supported by funding from DST (Department of Science and Technology) and MeitY (Ministry of Electronics and Information Technology).

According to the RRI team, this work derives its original motivation from the foundational work of Nobel Laureate Sir CV Raman on the scattering of light. They used laser cooling techniques to cool neutral atoms to temperatures near absolute zero and used laser light to consistently drive quantum transitions in these cold atoms and a polarimetric detection technique to accurately detect the dynamics of spin in these atoms. Eventually, they determined the lifespan of spins in cold atoms and found that they had a long lifespan – almost a millisecond, which is at least a thousand times the lifespan of spins in cold atoms. atoms at room temperature. The RRI team explained the observations using a theoretical framework based on advanced concepts of quantum mechanics.

“In this new technique, the spin dynamics of atoms could be detected at the level of a single atom instead of the overall properties detected using available techniques,” said the RRI team, explaining the importance of the new technique. According to the team, this technology can be used to make devices capable of accurately detecting small magnetic fields, which has important applications in mining and prospecting. The work also has important applications in biomedical imaging, where time-resolved measurements of small magnetic fields are needed. (ANI)

(This story was not edited by Devdiscourse staff and is auto-generated from a syndicated feed.)


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