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The End of the Quantum Ice Age: Room Temperature Breakthrough

February 14, 2024
in Science
The End of the Quantum Ice Age: Room Temperature Breakthrough
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Nanopillar Loaded Drum Sandwiched by Two Periodically Segmented Mirrors

Conceptual art of the operating device, consisting of a nanopillar-loaded drum sandwiched by two periodically segmented mirrors, allowing the laser light to strongly interact with the drum quantum mechanically at room temperature. Credit: EPFL & Second Bay Studios

Researchers at EPFL have achieved a milestone in quantum mechanics by controlling quantum phenomena at room temperature, overcoming the longstanding barrier of needing extreme cold. This opens up new possibilities for quantum technology applications and the study of macroscopic quantum systems.

In the realm of quantum mechanics, the ability to observe and control quantum phenomena at room temperature has long been elusive, especially on a large or “macroscopic” scale. Traditionally, such observations have been confined to environments near absolute zero, where quantum effects are easier to detect. However, the requirement for extreme cold has been a major hurdle, limiting practical applications of quantum technologies.

Pioneering Study at EPFL

Now, a study led by Tobias J. Kippenberg and Nils Johan Engelsen at EPFL, redefines the boundaries of what’s possible. The pioneering work blends quantum physics and mechanical engineering to achieve control of quantum phenomena at room temperature.

“Reaching the regime of room temperature quantum optomechanics has been an open challenge for decades,” says Kippenberg. “Our work realizes effectively the Heisenberg microscope – long thought to be only a theoretical toy model.”

In their experimental setup, published today (February 14) in Nature, the researchers created an ultra-low noise optomechanical system – a setup where light and mechanical motion interconnect, allowing them to study and manipulate how light influences moving objects with high precision.

Crystal Like Cavity Mirrors With Drum in Middle

The crystal-like cavity mirrors with the drum in the middle. Credit: Guanhao Huang/EPFL

The main problem with room temperature is thermal noise, which perturbs delicate quantum dynamics. To minimize that, the scientists used cavity mirrors, which are specialized mirrors that bounce light back and forth inside a confined space (the cavity), effectively “trapping” it and enhancing its interaction with the mechanical elements in the system. To reduce the thermal noise, the mirrors are patterned with crystal-like periodic (“phononic crystal”) structures.

Innovative Experimental Setup

Another crucial component was a 4mm drum-like device called a mechanical oscillator, which interacts with light inside the cavity. Its relatively large size and design are key to isolating it from environmental noise, making it possible to detect subtle quantum phenomena at room temperature. “The drum we use in this experiment is the culmination of many years of effort to create mechanical oscillators that are well-isolated from the environment,” says Engelsen.

“The techniques we used to deal with notorious and complex noise sources are of high relevance and impact to the broader community of precision sensing and measurement,” says Guanhao Huang, one of the two PhD students leading the project.

The setup allowed the researchers to achieve “optical squeezing”, a quantum phenomenon where certain properties of light, like its intensity or phase, are manipulated to reduce the fluctuations in one variable at the expense of increasing fluctuations in the other, as dictated by Heisenberg’s principle.

By demonstrating optical squeezing at room temperature in their system, the researchers showed that they could effectively control and observe quantum phenomena in a macroscopic system without the need for extremely low temperatures. Top of Form

The team believes the ability to operate the system at room temperature will expand access to quantum optomechanical systems, which are established testbeds for quantum measurement and quantum mechanics at macroscopic scales.

“The system we developed might facilitate new hybrid quantum systems where the mechanical drum strongly interacts with different objects, such as trapped clouds of atoms,” adds Alberto Beccari, the other PhD student leading the study. “These systems are useful for quantum information, and help us understand how to create large, complex quantum states.”

Reference: “Room-temperature quantum optomechanics using an ultra-low noise cavity” 14 February 2024, Nature.
DOI: 10.1038/s41586-023-06997-3

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Copyright for syndicated content belongs to the linked Source : SciTechDaily – https://scitechdaily.com/the-end-of-the-quantum-ice-age-room-temperature-breakthrough/

Tags: QuantumscienceTemperature
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