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Article overview
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Quantum speed limit from quantum-state diffusion method | | Wei Wu
; Jun-Hong An
; | | Date: |
1 Jun 2022 | | Abstract: | Characterizing the most efficient evolution, quantum speed limit (QSL) plays
a significant role in quantum technology. How to generalize the
well-established QSL from closed systems to open systems has attracted much
attention. In contrast to the previous schemes to quantify QSL from the reduced
dynamics of open system, we here propose a scheme to quantify QSL from the
point of view of the total system consisting of the open system and its
environment in the framework of quantum-state diffusion method. The application
of our scheme to a two-level system reveals that the system processes an
infinite speedup capacity in the noiseless case, which is destroyed by the
presence of an environment under the Born-Markovian approximation. It is
interesting to find that the capacity in the noiseless case is recovered in the
non-Markovian dynamics as long as a bound state is formed in the energy
spectrum of the total system. Enriching the quantification schemes of QSL, our
result provides an efficient way to control the QSL in practical environments. | | Source: | arXiv, 2206.00321 | | Services: | Forum | Review | PDF | Favorites | |
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