In recent years, there has been a paradigm shift in energy manipulation with the advent of quantum thermodynamics. The concept of quantum batteries (QBs) has emerged as a promising avenue for efficient and fast energy storage at the quantum level. QBs leverage non-classical features such as quantum coherence and entanglement to achieve superior charging processes compared to classical batteries.
A QB is charged through an interaction protocol between the QB and a charger, which can be either an external field or another quantum system. However, the interaction of QBs with their surrounding environment introduces decoherence, limiting their performance. Decoherence causes the leakage of coherence to the environment, rendering QBs less effective in energy storage and extraction.
To address this challenge, researchers have focused on developing open system protocols to stabilize the charging cycle performance of QBs. Studies have explored the effects of non-Markovian environments, quantum control techniques, and feedback control methods to enhance QB performance. Recent work has also investigated the impact of translational motion on the performance of qubit-based QBs.
In a previous study, it was found that the movement of the quantum battery inside a cavity had a negative effect on the charging process. However, in our present work, we propose a moving-biparticle system consisting of a qubit-battery and a qubit-charger that interact with their respective local environments. By adjusting the velocities of the charger and battery qubits, we aim to improve the charging cycle performance of QBs.
Our results demonstrate that increasing the speed of the charger and battery qubits enhances the charging characteristics, including the charging energy, efficiency, and ergotropy. Interestingly, in the Markovian dynamics, when the charger and battery move at higher velocities, the initial energy of the charger is completely transferred to the battery. This enables the extraction of the total stored energy as work for an extended period.
These findings highlight the robustness and reliability of open moving-qubit systems as QBs. They offer significant promise for experimental implementations and pave the way for further advancements in quantum energy storage technologies.
Frequently Asked Questions (FAQ)
What is a quantum battery?
A quantum battery is a finite-dimensional quantum system that can store energy temporarily in its quantum degrees of freedom for later use. It utilizes quantum coherence and entanglement to achieve more efficient and faster charging processes compared to classical batteries.
What is the challenge with quantum batteries?
The interaction of quantum batteries with their surrounding environments leads to decoherence, causing the leakage of coherence to the environment. This decoherence hampers the charging and discharging performance of quantum batteries and limits their ability to extract work in cyclic processes.
How can we enhance the charging cycle performance of quantum batteries?
Researchers have focused on developing open system protocols and quantum control techniques to stabilize the charging cycle performance of quantum batteries. Other strategies include utilizing non-Markovian environments, feedback control methods, and adjusting the velocities of the qubits involved in the charging process.
What are the benefits of translational motion in quantum battery charging?
Studies have shown that translational motion of qubits can stabilize the entanglement and coherence of a two-qubit system against environmental dissipations. By suitably adjusting the velocities of the qubits, it is possible to improve the charging cycle performance of qubit-based quantum batteries.