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@ARTICLE{Kcher:810904,
      author       = {Köcher, Simone Swantje and Heydenreich, T. and Zhang, Y.
                      and Reddy, G. N. M. and Caldarelli, S. and Yuan, J. and
                      Glaser, S. J.},
      title        = {{T}ime-optimal excitation of {M}aximum {Q}uantum coherence:
                      {P}hysical {L}imits and pulse sequences},
      journal      = {The journal of chemical physics},
      volume       = {144},
      number       = {16},
      issn         = {1089-7690},
      address      = {Melville, NY},
      publisher    = {American Institute of Physics},
      reportid     = {FZJ-2016-03478},
      pages        = {164103 -},
      year         = {2016},
      abstract     = {Here we study the optimum efficiency of the excitation of
                      maximum quantum (MaxQ) coherence using analytical and
                      numerical methods based on optimal control theory. The
                      theoretical limit of the achievable MaxQ amplitude and the
                      minimum time to achieve this limit are explored for a set of
                      model systems consisting of up to five coupled spins. In
                      addition to arbitrary pulse shapes, two simple pulse
                      sequence families of practical interest are considered in
                      the optimizations. Compared to conventional approaches,
                      substantial gains were found both in terms of the achieved
                      MaxQ amplitude and in pulse sequence durations. For a model
                      system, theoretically predicted gains of a factor of three
                      compared to the conventional pulse sequence were
                      experimentally demonstrated. Motivated by the numerical
                      results, also two novel analytical transfer schemes were
                      found: Compared to conventional approaches based on
                      non-selective pulses and delays, double-quantum coherence in
                      two-spin systems can be created twice as fast using
                      isotropic mixing and hard spin-selective pulses. Also it is
                      proved that in a chain of three weakly coupled spins with
                      the same coupling constants, triple-quantum coherence can be
                      created in a time-optimal fashion using so-called geodesic
                      pulses.},
      cin          = {IEK-9},
      ddc          = {540},
      cid          = {I:(DE-Juel1)IEK-9-20110218},
      pnm          = {131 - Electrochemical Storage (POF3-131) / HITEC -
                      Helmholtz Interdisciplinary Doctoral Training in Energy and
                      Climate Research (HITEC) (HITEC-20170406)},
      pid          = {G:(DE-HGF)POF3-131 / G:(DE-Juel1)HITEC-20170406},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000375785800010},
      pubmed       = {pmid:27131527},
      doi          = {10.1063/1.4945781},
      url          = {https://juser.fz-juelich.de/record/810904},
}