itebd_expected1_z.cc

// -*- mode: c++; fill-column: 80; c-basic-offset: 2; indent-tabs-mode: nil -*-
/*
    Copyright (c) 2012 Juan Jose Garcia Ripoll

    Tensor is free software; you can redistribute it and/or modify it
    under the terms of the GNU Library General Public License as published
    by the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Library General Public License for more details.

    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include <mps/tools.h>
#include <mps/itebd.h>

namespace mps {

  cdouble
  expected(const iTEBD<CTensor> &psi, const CTensor &Op, int site)
  {
    if (site & 1)
      return string_order(psi, CTensor(), 0, CTensor(), Op, 1);
    else 
      return string_order(psi, Op, 0, CTensor(), CTensor(), 1);
  }

}