China sets world record, ‘traps’ light for 4,035 seconds to boost quantum information

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China sets world record, ‘traps’ light for 4,035 seconds to boost quantum information

Scientists at the Beijing Academy of Quantum Information Sciences (BAQIS) have shattered the world record for light storage. Recently, they successfully held light-based information for an unprecedented 4,035 seconds – over an hour.

“Storing light has always been a challenge across the world,” said Liu Yulong, an associate researcher at BAQIS and the study’s first author, as reported by China’s

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This remarkable feat represents a major step forward in the quest to harness the power of quantum mechanics.

Traditionally, storing light has been a formidable challenge. Photons, the fundamental light particles, travel at incredible speeds, making them notoriously difficult to capture and store. Moreover, directly storing photons is not feasible with current technology.

Converting light signals into sound

The research team overcame this hurdle by converting light signals into sound signals. Being much slower, these sound signals are easier to manipulate and store.

“Think of photons as tiny ****** moving at high speeds. When they collide with a thin film, the light’s amplitude, frequency, and other information are converted into sound signals. By storing these sound signals in the film, we achieve light storage,” added Li Tiefu, another researcher at BAQIS.

Utilizing a single-crystal silicon carbide film could effectively trap the light information within the material’s structure.

“The key was finding a medium capable of converting light signals into sound signals, effectively ‘trapping’ light,”

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Xinhua.

“Silicon-carbide crystals, known for their high thermal conductivity and in-plane stress, hold significant promise for the development of high-quality mechanical oscillators,” explained the study.

Overcoming previous limitations

This innovative approach surpasses previous attempts that relied on materials like metallic aluminum and silicon nitride.

These materials suffer from internal material losses and can only maintain vibrations for a fraction of a second. This severely limits the duration of light storage.

The superior properties of single-crystal silicon carbide, including its exceptional frequency stability and minimal internal losses. This enabled the researchers to achieve unprecedented storage duration.

“Benefiting from extremely high mechanical frequency stability, this interface enables tunable light slowing with group delays extending up to an impressive duration of an hour,” explained the study.

Moreover, the single-crystal silicon carbide film performs even at extremely low temperatures.

“The high thermal conductivity of cubic silicon-carbide crystals mechanical resonators at low temperatures ensures effective thermalization to millikelvin levels, resulting in exceptional frequency stability and extremely small pure dephasing,” added the researchers in the study.

Quantum computing applications

The potential applications of this breakthrough are far-reaching. The ability to store light for extended periods could revolutionize quantum computing and enable the development of more powerful and efficient quantum computers.

Quantum computers, unlike classical computers, leverage the principles of quantum mechanics to perform complex calculations at unprecedented speeds.

The researchers are now focused on extending the storage duration, increasing information density, and improving compatibility with other quantum technologies.

“In the field of quantum information processing, controlling and dissipating heat generated by quantum devices are crucial for maintaining quantum coherence,” concluded

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, which has been published in the journal Nature Communications.

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