Indefinite Causal Order in Quantum Batteries
- URL: http://arxiv.org/abs/2105.12466v1
- Date: Wed, 26 May 2021 10:48:10 GMT
- Title: Indefinite Causal Order in Quantum Batteries
- Authors: Yuanbo Chen and Yoshihiko Hasegawa
- Abstract summary: We show how a novel class of resource comes into play in quantum batteries.
We demonstrate for a non-unitary charging protocol, the indefinite causal order version charger yields a charged battery with higher energy.
- Score: 4.307704177248648
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Operations performing on quantum batteries are extended to scenarios where we
no longer force the existence of definite causal order of occurrence between
distinct processes. In contrast to standard theories, the so called indefinite
causal order is found to have the capability of accomplishing tasks that are
not possible without it. Specifically, we show how this novel class of resource
comes into play in quantum batteries by first, combining two static unitary
chargers into a coherently superposed one to fully charge an empty battery even
if in the presence of battery's local Hamiltonian. Then we demonstrate for a
non-unitary charging protocol, the indefinite causal order version charger
yields a charged battery with higher energy over its classical counterpart
under any conditions. We also have a finding that runs counter to our intuition
which, roughly speaking, has the implication that a relatively less powerful
charger guarantees a charged battery with higher energy. Finally, to reduce the
cost imposed by a measurement-based protection scheme, indefinite causal order
shows its potential to fulfill this goal.
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