Indian Scientists Develop New Technique For Efficient Quantum Computing

A study conducted by researchers (highlighted in an IANS report) from the Raman Research Institute has discovered that spin coherence in atomic systems is long-lived at extremely low temperatures.

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The study derives its original motivation from Nobel laureate Sir C.V.Raman¡¯s seminal work on light scattering,

This comes after they developed a new technique to measure spin coherences since a system with long-lived spin coherence is considered a better resource as a quantum computer.

According to the Science and Technology Ministry, this allows better implementation of quantum operations and logic gates, so that a system becomes a better quantum sensor compared to systems with short-lived coherences.

This new behaviour of quantum systems at low temperatures can be used for efficient quantum sensing and quantum information processing for application in quantum computation and secure communication.

The ministry highlighted that the newly discovered technique could help study the real-time dynamics of quantum phenomena like quantum phase transitions in a non-invasive manner.

To the unaware, spin is a fundamental quantum property of atoms and elementary particles like electrons and protons. As atoms get colder, their quantum nature is transformed more prominently.

However, even though the spin degree of freedom is a highly discussed topic in the field of quantum information processing, the dynamical measurements on spins at ultralow temperatures were not available, since detection techniques in cold atom experiments were destructive, disturbing the atomic sample along the way.

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Representational Image: Unsplash

However, researchers at the Raman Research Institute developed a new method to measure the spin properties of atoms cooled to micro-Kelvin temperatures. The new technique allows measurement of the properties of spins and lifetime of an atomic spin state with a million-fold improvement in detection sensitivity compared to existing technology.

Researchers were able to increase the signal strength of spin noise by a million-fold, by using a coherent laser drive. They made the spin noise spectroscopy technique usable for spectroscopists measuring systems where the signal levels were really low to be detected.

Scientists are of the belief that this technology could help make devices that can detect small magnetic fields that have applications in mining and prospecting. This also has applications in the biomedical imaging industry where time-resolved measurements of small magnetic fields are desired.

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