Preservation and enhancement of quantum correlations under Stark effect
- URL: http://arxiv.org/abs/2303.14030v1
- Date: Fri, 24 Mar 2023 14:44:03 GMT
- Title: Preservation and enhancement of quantum correlations under Stark effect
- Authors: Nitish Kumar Chandra, Rajiuddin Sk and Prasanta K. Panigrahi
- Abstract summary: We analyze the dynamics of quantum correlations by obtaining the exact expression of Bures distance entanglement, trace distance, discord and local quantum uncertainty of two two-level atoms.
Our results demonstrate that quantum correlations can be sustained for an extended period in the presence of Stark shift effect.
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- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: We analyze the dynamics of quantum correlations by obtaining the exact
expression of Bures distance entanglement, trace distance discord, and local
quantum uncertainty of two two-level atoms. Here, the atoms undergo two-photon
transitions mediated through an intermediate virtual state where each atom is
separately coupled to a dissipative reservoir at zero temperature in the
presence of the Stark shift effect. We have investigated the dynamics of this
atomic system for two different initial conditions of the environment. In the
first case, we have assumed the environment's state to be in ground state and
in the other case, we have assumed the state to be in first excited state. The
second initial condition is significant as it shows the role played by both the
Stark shift parameters in contrast to only one of the Stark shift parameters
for the first initial condition. Our results demonstrate that quantum
correlations can be sustained for an extended period in the presence of Stark
shift effect in the case of both Markovian and non-Markovian reservoirs. The
effect in the non-Markovian reservoir is more prominent than the Markovian
reservoir, even for a very small value of the Stark shift parameter. We observe
that among the correlation measures considered, only local quantum uncertainty
is accompanied by a sudden change phenomenon, i.e., an abrupt change in the
decay rate of a correlation measure. Our findings are significant as preserving
quantum correlations is one of the essential aspects in attaining optimum
performance in quantum information tasks.
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