Local coherence by thermalized intra-system coupling
- URL: http://arxiv.org/abs/2211.08851v2
- Date: Fri, 15 Dec 2023 12:51:51 GMT
- Title: Local coherence by thermalized intra-system coupling
- Authors: Michal Kol\'a\v{r} and Radim Filip
- Abstract summary: Quantum superposition of energy eigenstates can appear autonomously in a single quantum two-level system coupled to a low-temperature thermal bath.
We propose a different and more feasible approach employing engineered interactions between two-level systems being thermalized into a global Gibbs state.
- Score: 0.0
- License: http://creativecommons.org/licenses/by-nc-sa/4.0/
- Abstract: Quantum superposition of energy eigenstates can appear autonomously in a
single quantum two-level system coupled to a low-temperature thermal bath, if
such coupling has a proper composite nature. We propose here a principally
different and more feasible approach employing engineered interactions between
two-level systems being thermalized into a global Gibbs state by weakly coupled
thermal bath at temperature $T$. Therefore, in such case quantum coherence
appears by a different mechanism, whereas the system-bath coupling does not
have to be engineered. We demonstrate such autonomous coherence generation
reaching maximum values of coherence. Moreover, it can be alternatively built
up by using weaker but collective interaction with several two-level systems.
This approach surpasses the coherence generated by the engineered system-bath
coupling for comparable interaction strengths and directly reduces phase
estimation error in quantum sensing. This represents a necessary step towards
the autonomous quantum sensing.
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