Unveiling the impact of memory in the multi-phase development of quantum systems
In a groundbreaking study, a team led by Academician GUO Guangcan from the University of Science and Technology of the Chinese Academy of Sciences, in collaboration with Austrian theoretical physicist Philip Taranto, has made significant strides in the understanding of non-Markovianity in the multi-step evolution of open quantum systems.
The research, published in Physical Review Letters with the DOI 10.1103/PhysRevLett.126.230401, focuses on memory effects in open quantum systems, a subject of interest in quantum information science. The evolution of open quantum systems presents non-Markovianity due to the coupling with the environment.
The team constructed two kinds of open quantum dynamics with the multi-step evolution through path and polarization degrees of freedom of photon pairs. They demonstrated the non-Markovianity in the multi-step evolution of the open quantum system, which has implications for the approximation of quantum processes with memory.
Memory effects are common in various natural phenomena, including disease spreading, biochemical processes, and optical fiber transmission. In quantum information science, understanding and controlling the memory effects are crucial for the development of quantum technology.
The researchers separated controllable detection from the system evolution using the process tensor method. They proved the measurement-dependent property of quantum memory effects, a finding that expands the understanding of memory effects in open quantum systems beyond the context of quantum information science.
The study is the first report of finite quantum Markov order for non-Markovian common-cause processes. The findings of the study may have implications for the approximation of quantum processes with memory in various fields.
The study underlines the importance of considering the duration, strength, and structure of memory effects in open quantum systems. Memory effects in open quantum systems have been a subject of research in quantum information science, and this new research provides valuable insights that could potentially accelerate the development of quantum technology.
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