Scientists tap diamond defects to build quantum batteries that resist self-discharging and store energy longer.
Researchers have unveiled a promising new approach to building longer-lasting quantum batteries using a well-known defect in diamond.The design tackles the problem of spontaneous energy loss, one of the biggest flaws in these futuristic devices, and brings them closer to practical reality.
Quantum batteries have long been considered a potential alternative to classical batteries. They leverage unique quantum effects like entanglement and superposition to charge faster and deliver more energy. But so far, their real-world performance has been underwhelming, largely due to decoherence. This phenomenon, which occurs when quantum systems interact with the environment, causes the battery to lose its stored energy, a process known as self-discharging.A new paper presents a way to reduce this problem. Researchers from Hubei University, the Chinese Academy of Sciences, and Lanzhou University propose a QB design built around the nitrogen-vacancy center in diamond. The NV center’s electron spin acts as the core of the battery.Suppressing spontaneous energy lossThe team found that the NV center offers an intrinsic advantage: it can suppress self-discharging without needing external control or a quantum charger.“Several schemes have been proposed to suppress the self-discharging of QBs, but they require a quantum charger,” said Jun-Hong An, co-senior author of the study. “However, the charger-battery entanglement would decrease the ergotropy of QBs.”Ergotropy refers to the maximum useful work extractable from a system. When a quantum battery is entangled with a charger, its ergotropy can drop. The NV-based design avoids that trade-off by relying on internal quantum features, specifically the hyperfine interaction between the NV center’s electron and nitrogen nucleus.This interaction allows researchers to control how energy is stored and maintained within the quantum battery, especially the coherent part, which decays slower than incoherent energy. By optimizing the ratio of coherent to total ergotropy, the battery can hold onto energy longer and release more useful work.Jun-Hong An and his colleagues shared their findings in conversation with Phys.org.From quantum theory to energy tech“The practical realization and application of QBs face two major challenges,” said An. “One is the degraded charging efficiency due to decoherence during the charging process. The other is the spontaneous energy loss, called self-discharging, caused by decoherence during the storage process.”The group previously tackled the first challenge using a wireless-charging protocol that protected the system from aging. Their latest study addresses the second issue head-on. And unlike earlier proposals, it doesn’t require a quantum charger or added complexity.Their QB model takes full advantage of the NV center, a defect in a diamond that has already seen use in quantum sensing and computing. Its spin properties are well-studied and stable at room temperature, making it one of the most realistic platforms for implementing quantum devices.As quantum thermodynamics gains ground as a field, designs like these could open the door to a new generation of energy storage, faster, cleaner, and powered by quantum physics.The study is published in the journal Physical Review Letters.
Diamond Defect Energy Storage Nitrogen-Vacancy Center Quantum Battery Quantum Thermodynamics
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