Preserving quantum correlations and coherence with non-Markovianity
- URL: http://arxiv.org/abs/2106.13573v1
- Date: Fri, 25 Jun 2021 11:52:51 GMT
- Title: Preserving quantum correlations and coherence with non-Markovianity
- Authors: Marek Miller, Kang-Da Wu, Manfredi Scalici, Jan Kolodynski, Guo-Yong
Xiang, Chuan-Feng Li, Guang-Can Guo, Alexander Streltsov
- Abstract summary: We demonstrate the usefulness of non-Markovianity for preserving correlations and coherence in quantum systems.
For covariant qubit evolutions, we show that non-Markovianity can be used to preserve quantum coherence at all times.
- Score: 50.591267188664666
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Open quantum systems exhibit a rich phenomenology, in comparison to closed
quantum systems that evolve unitarily according to the Schr\"odinger equation.
The dynamics of an open quantum system are typically classified into Markovian
and non-Markovian, depending on whether the dynamics can be decomposed into
valid quantum operations at any time scale. Since Markovian evolutions are
easier to simulate, compared to non-Markovian dynamics, it is reasonable to
assume that non-Markovianity can be employed for useful quantum-technological
applications. Here, we demonstrate the usefulness of non-Markovianity for
preserving correlations and coherence in quantum systems. For this, we consider
a broad class of qubit evolutions, having a decoherence matrix separated from
zero for large times. While any such Markovian evolution leads to an
exponential loss of correlations, non-Markovianity can help to preserve
correlations even in the limit $t \rightarrow \infty$. For covariant qubit
evolutions, we also show that non-Markovianity can be used to preserve quantum
coherence at all times, which is an important resource for quantum metrology.
We explicitly demonstrate this effect experimentally with linear optics, by
implementing the required evolution that is non-Markovian at all times.
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