Quantum speed-up in collisional battery charging

• URL: http://arxiv.org/abs/2105.01863v2
• Date: Tue, 24 Aug 2021 05:48:12 GMT
• Title: Quantum speed-up in collisional battery charging
• Abstract summary: We present a collision model for the charging of a quantum battery by identical nonequilibrium qubit units. We show that coherent protocols can yield higher charging power than any possible incoherent strategy.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We present a collision model for the charging of a quantum battery by identical nonequilibrium qubit units. When the units are prepared in a mixture of energy eigenstates, the energy gain in the battery can be described by a classical random walk, where both average energy and variance grow linearly with time. Conversely, when the qubits contain quantum coherence, interference effects buildup in the battery and lead to a faster spreading of the energy distribution, reminiscent of a quantum random walk. This can be exploited for faster and more efficient charging of a battery initialized in the ground state. Specifically, we show that coherent protocols can yield higher charging power than any possible incoherent strategy, demonstrating a quantum speed-up at the level of a single battery. Finally, we characterize the amount of extractable work from the battery through the notion of ergotropy.

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