A mathematical shortcut for determining quantum information lifetimes

A mathematical shortcut for determining quantum information lifetimes

Scientists have uncovered a mathematical shortcut for calculating an all-important feature of quantum devices.

Having crunched the numbers on the quantum properties of 12,000 elements and compounds, researchers have published a new equation for approximating the length of time the materials can maintain quantum information, called “coherence time.”

The elegant formula allows scientists to estimate the materials’ coherence times in an instant — versus the hours or weeks it would take to calculate an exact value. The team’s equation applies to a particular class of materials, those that can be used in devices called spin qubits.

While the research team’s equation gives only a rough prediction of a material’s coherence time, it gets pretty close to the true value. And what the equation lacks in precision, it makes up for in convenience: It requires only five numbers — the values of five particular properties of the material in question — to get a solution.

The work has been published in the Proceedings of the National Academy of Sciences.

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