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7 June 2017 Time-continuous open quantum walks (Conference Presentation)
Radhakrishnan Balu, Chaobin Liu
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Proceedings Volume 10193, Ultrafast Bandgap Photonics II; 101931A (2017) https://doi.org/10.1117/12.2262502
Event: SPIE Defense + Security, 2017, Anaheim, CA, United States
Abstract
Continuous-time open quantum walks (CTOQW) are introduced as the formulation of quantum dynamical semigroups of trace-preserving and completely positive linear maps (or quantum Markov semigroups) on graphs. We show that a CTOQW always converges to a steady state regardless of the initial state when a graph is connected. When the graph is both connected and regular, it is shown that the steady state is the maximally mixed state. The difference of long-time behaviors between CTOQW and other two continuous-time processes on graphs is exemplified. The examples demonstrate that the structure of a graph can affect a quantum coherence effect on CTOQW through a long time run. Precisely, a quantum coherence effect persists throughout the evolution of the CTOQW when the underlying topology is certain irregular graphs (such as a path or a star as shown in the examples). In contrast, a quantum coherence effect will eventually vanish from the open quantum system when the underlying topology is a regular graph (such as a cycle).
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Radhakrishnan Balu and Chaobin Liu "Time-continuous open quantum walks (Conference Presentation)", Proc. SPIE 10193, Ultrafast Bandgap Photonics II, 101931A (7 June 2017); https://doi.org/10.1117/12.2262502
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KEYWORDS
Stars
Current controlled current source
Photonics
Ultrafast phenomena
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