updated libquantum 0.2.3 source files

density.h

@@ -0,0 +1,67 @@
+/* density.h: Declarations for density.c
+
+   Copyright 2004 Bjoern Butscher, Hendrik Weimer
+
+   This file is part of libquantum
+
+   libquantum is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published
+   by the Free Software Foundation; either version 2 of the License,
+   or (at your option) any later version.
+
+   libquantum 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
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with libquantum; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+   USA
+
+*/
+
+#ifndef __DENSITY_H
+
+#define __DENSITY_H
+
+#include "qureg.h"
+
+#define quantum_density_wrapper_ubt(reg, ctl, ...) \
+quantum_unbounded_toffoli(ctl, reg, __VA_ARGS__)
+
+#define quantum_density_operation(function, rho, ...) \
+do{ \
+  int quantum_int; \
+  if ((void *) function == quantum_unbounded_toffoli) \
+    { \
+      for(quantum_int=0; quantum_int < rho.num; quantum_int++) \
+        quantum_density_wrapper_ubt(&rho.reg[quantum_int], __VA_ARGS__); \
+    } \
+  else \
+  { \
+    for(quantum_int=0; quantum_int < rho.num; quantum_int++) \
+      function(__VA_ARGS__, &rho.reg[quantum_int]); \
+  } \
+} while(0)
+
+struct quantum_density_op_struct
+{
+  int num;          /* total number of state vectors */
+  float *prob;      /* probabilities of the state vectors */
+  quantum_reg *reg; /* state vectors */
+};
+
+typedef struct quantum_density_op_struct quantum_density_op;
+
+extern quantum_density_op quantum_new_density_op(int num, float *prob,
+						 quantum_reg *reg);
+extern quantum_density_op quantum_qureg2density_op(quantum_reg *reg);
+extern void quantum_reduced_density_op(int pos, quantum_density_op *rho);
+
+extern void quantum_print_density_matrix(quantum_density_op *rho);
+extern void quantum_delete_density_op(quantum_density_op *rho);
+
+extern float quantum_purity(quantum_density_op *rho);
+
+#endif