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|a Lloyd, Seth
|e author
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|a Massachusetts Institute of Technology. Department of Mechanical Engineering
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|a Massachusetts Institute of Technology. Research Laboratory of Electronics
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|a W. M. Keck Foundation Center for Extreme Quantum Information Theory
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|a Lloyd, Seth
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|a Lloyd, Seth
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|a Mohseni, Masoud
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|a Mohseni, Masoud
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|a Symmetry-enhanced supertransfer of delocalized quantum states
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|b IOP Publishing,
|c 2012-06-28T13:01:17Z.
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|z Get fulltext
|u http://hdl.handle.net/1721.1/71244
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|a Coherent hopping of excitation relies on quantum coherence over physically extended states. In this work, we consider simple models to examine the effect of symmetries of delocalized multi-excitation states on the dynamical timescales, including hopping rates, radiative decay and environmental interactions. While the decoherence (pure dephasing) rate of an extended state over N sites is comparable to that of a non-extended state, superradiance leads to a factor of N enhancement in decay and absorption rates. In addition to superradiance, we illustrate how the multi-excitonic states exhibit 'supertransfer' in the far-field regime-hopping from a symmetrized state over N sites to a symmetrized state over M sites at a rate proportional to MN. We argue that such symmetries could play an operational role in physical systems based on the competition between symmetry-enhanced interactions and localized inhomogeneities and environmental interactions that destroy symmetry. As an example, we propose that supertransfer and coherent hopping play a role in recent observations of anomalously long diffusion lengths in nano-engineered assembly of light-harvesting complexes.
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|a W. M. Keck Foundation Center for Extreme Quantum Information Theory
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|a Natural Sciences and Engineering Research Council of Canada (NSERC)
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|a Lockheed Martin
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|a United States. Defense Advanced Research Projects Agency
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|a en_US
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|a Article
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|t New Journal of Physics
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