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
- Authors: Stella Seah, Mart\'i Perarnau-Llobet, G\'eraldine Haack, Nicolas
Brunner, Stefan Nimmrichter
- 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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