Investigate the effects of the existence of correlation between two consecutive use of the quantum channel on quantum speed limit time
Memory effects play an important role in the theory of open quantum systems. There are two completely independent insights about memory for quantum channels. In quantum information theory, the memory of the quantum channel is depicted by the correlations between consecutive uses of the channel on a...
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Main Authors | , , , , , |
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Format | Journal Article |
Language | English |
Published |
26.05.2019
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Subjects | |
Online Access | Get full text |
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Summary: | Memory effects play an important role in the theory of open quantum systems.
There are two completely independent insights about memory for quantum
channels. In quantum information theory, the memory of the quantum channel is
depicted by the correlations between consecutive uses of the channel on a set
of quantum systems. In the theory of open quantum systems memory effects result
from correlations which are created during the quantum evolution. Here, we
study the quantum speed limit time for correlated quantum channel i.e. when
there exist correlation between consecutive uses of quantum channel . Quantum
speed limit time is the bound on the minimal time evolution between initial and
target states. It is apply for quantifying the maximum speed of quantum
evolution. In this work, we will consider correlated pure dephasing colored
noise as an example of unital quantum channels and correlated squeezed
generalized amplitude damping channel as an example of non-unital quantum
channels. We evaluate the quantum speed limit time for these two channel. We
find that regardless of whether the channel is unital or not, the quantum speed
limit time is increased by increasing correlation between two consecutive uses
of the channel. |
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DOI: | 10.48550/arxiv.1905.11385 |