mps-0.0.0
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itebd_expected2_d.cc
1 // -*- mode: c++; fill-column: 80; c-basic-offset: 2; indent-tabs-mode: nil -*-
2 /*
3  Copyright (c) 2012 Juan Jose Garcia Ripoll
4 
5  Tensor is free software; you can redistribute it and/or modify it
6  under the terms of the GNU Library General Public License as published
7  by the Free Software Foundation; either version 2 of the License, or
8  (at your option) any later version.
9 
10  This program is distributed in the hope that it will be useful,
11  but WITHOUT ANY WARRANTY; without even the implied warranty of
12  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  GNU Library General Public License for more details.
14 
15  You should have received a copy of the GNU General Public License along
16  with this program; if not, write to the Free Software Foundation, Inc.,
17  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 */
19 
20 #include <mps/tools.h>
21 #include <mps/itebd.h>
22 
23 namespace mps {
24 
25  double
26  expected(const RiTEBD &psi, const RTensor &Op1, const RTensor &Op2)
27  {
28  return expected(psi, Op1, 0, Op2, 1);
29  }
30 
31  double
32  expected(const RiTEBD &psi, const RTensor &Op1, int i,
33  const RTensor &Op2, int j)
34  {
35  return string_order(psi, Op1, i, RTensor(), Op2, j);
36  }
37 
38 }
double string_order(const RiTEBD &psi, const RTensor &Opi, int i, const RTensor &Opmiddle, const RTensor &Opj, int j)
String order parameter between sites 'i' and 'j', both included.
An infinite Matrix Product State with translational invariance but using two tensors: one for odd and...
Definition: itebd.h:41
double expected(const RMPS &psi, const Hamiltonian &H, double t)
Expected value of a Hamiltonian over a matrix product state.