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A view inside the quantum battery lab at CSIRO, Australia’s national science agency.(Image credit: University of Melbourne)Share this article 0Join the conversationFollow usAdd us as a preferred source on GoogleSubscribe to our newsletter
Scientists have engineered the planet’s inaugural compact, experimental quantum battery. If this innovation can be duplicated, it might revolutionize energy storage permanently and unlock novel potentials for lightweight, remote power solutions, according to experts.
The research cohort detailed their blueprint for the quantum battery in a paper released on March 13 in the journal Light: Science & Applications. They suggest it can serve for prolonged energy retention, alongside high-capacity energy storage needs such as substantial electric vehicles.
In a typical lithium-ion (Li-ion) battery, ions traverse between the cathode and anode via an electrolyte. However, within a quantum battery, energy is preserved as electromagnetic excitation across synchronized molecules — molecules that share defined internal states, such as their vibrational energy or electron configurations. This characteristic enables them to maintain a consistent relation with each other.
Quantum batteries operate based on the peculiar principles of quantum mechanics. In this instance, the researchers utilized quantum coherence — a phenomenon where a collection of local particles simultaneously exists in multiple states. These particles, while in a “superposition” of states, behave in predictable manners relative to one another. Accumulated within the battery, these coherent particles undergo quantum entanglement, signifying they are not merely aligned but functionally identical, forming a single, larger entity.
This mechanism permits all molecules within the battery to absorb energy at a uniform rate, irrespective of its physical dimensions. The greater the number of molecules involved, the more effectively energy is assimilated throughout the system, implying that charging durations actually diminish in practical terms as the battery size increases.
“Much like standard batteries, quantum batteries capture, hold, and release energy,” Hutchinson elaborated in the statement. “But whereas ordinary batteries depend on chemical reactions, quantum batteries harness the characteristics of quantum mechanics. The quantum advantage lies in the system absorbing light in a singular, vast ‘super absorption’ event, which accelerates battery charging.”
Composition of the quantum battery
To construct the battery, the researchers employed the Dicke model from quantum optics, which posits that when light and matter interact beyond a specific threshold, they can become superradiant — leading a collective of emitters to release light as a brief, intense burst.
Practically speaking, the battery comprises multiple organic semiconductor layers (where the interaction happens) enclosed between silver mirrors. This creates a microcavity — a microscopic structure that confines light within a limited space, facilitating multiple reflections.
This setup enables the coherent assembly of molecules or atoms to emit light in a synchronized pulse — a critical function for discharging the quantum battery — as well as to absorb light at a rate proportional to the square of the number of coherent molecules. This phenomenon is termed superabsorption. The microcavity is vital for facilitating both coupling and superabsorption, as it provides the necessary confined environment to achieve the specific ratio between light and matter stipulated by the Dicke model.
Positioned below and above the organic semiconductors, electron blocking and transport layers ensure that electrons can flow towards the cathode and electrodes when required, enabling the system to function effectively as a battery.
During experiments conducted at the University of Melbourne’s Ultrafast and Microspectroscopy Laboratories, the researchers projected a laser pulse with a bandwidth of 31 nanometers for a femtosecond (one quadrillionth of a second). This action induced an excited state in the molecules that persisted for tens of nanoseconds (several hundred millionths of a second).
Consequently, the battery is capable of retaining a charge for a duration that is 1 million times longer than its charging period.
On this scale, a battery that required one minute to charge could remain energized for “a couple of years,” stated James Quach, the lead researcher and CSIRO science leader, Australia’s national science agency, in comments to The Guardian.
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Moving forward, the researchers intend to enlarge the battery’s scale while preserving its charge-holding capability. This presents a significant challenge, as the energy stored in quantum batteries is vulnerable to environmental disturbances, which can disrupt or negate quantum behavior through a process known as decoherence.
Should this hurdle be successfully navigated, the ramifications of a functional quantum battery could be substantial. For example, wireless charging via lasers might create additional prospects for battery applications in drones or aircraft, enabling them to be recharged while airborne.
Andrew White, head of the Quantum Technology Laboratory at the University of Queensland, indicated to The Guardian that an initial application could involve powering quantum computers with a remarkably low energy expenditure.
Sourse: www.livescience.com