Anders and Briegel in Python
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  1. var ngbh = {};
  2. var vops = {};
  3. var meta = {};
  4. function add_node(node, m) {
  5. ngbh[node] = {};
  6. vops[node] = clifford.hadamard;
  7. meta[node] = m ? m : {};
  8. }
  9. function add_nodes(nodes) {
  10. nodes.forEach(add_node);
  11. }
  12. function add_edge(a, b) {
  13. ngbh[a][b] = true;
  14. ngbh[b][a] = true;
  15. }
  16. function add_edges(edges) {
  17. edges.forEach(function(e) {
  18. add_edge(e[0], e[1]);
  19. });
  20. }
  21. function del_edge(a, b) {
  22. delete ngbh[a][b];
  23. delete ngbh[b][a];
  24. }
  25. function has_edge(a, b) {
  26. return Object.prototype.hasOwnProperty.call(ngbh[a], b);
  27. }
  28. function toggle_edge(a, b) {
  29. if (has_edge(a, b)) {
  30. del_edge(a, b);
  31. } else {
  32. add_edge(a, b);
  33. }
  34. }
  35. function get_swap(node, avoid) {
  36. for (var i in ngbh[node]) {
  37. if (i != avoid) {return i;}
  38. }
  39. return avoid;
  40. }
  41. function remove_vop(node, avoid) {
  42. var swap_qubit = get_swap(node, avoid);
  43. var decomposition = decompositions[vops[node]];
  44. for (var i=decomposition.length-1; i >=0; --i) {
  45. var v = decomposition[i];
  46. local_complementation(v == "x" ? a : swap_qubit);
  47. }
  48. }
  49. function local_complementation(node) {
  50. var keys = Object.keys(ngbh[node]);
  51. for (var i=0; i < keys.length; ++i) {
  52. for (var j=i+1; j < keys.length; ++j) {
  53. toggle_edge(keys[i], keys[j]);
  54. }
  55. vops[i] = times_table[vops[keys[i]]][sqz_h];
  56. }
  57. vops[node] = times_table[vops[node]][msqx_h];
  58. }
  59. function act_local_rotation(node, operation) {
  60. var rotation = clifford[operation];
  61. vops[node] = times_table[rotation][vops[node]];
  62. }
  63. function act_hadamard(node){
  64. act_local_rotation(node, 10);
  65. }
  66. function is_sole_member(node, group){
  67. return group.length == 1 && group[0] == node;
  68. }
  69. function act_cz(a, b){
  70. if (is_sole_member(ngbh[a], b)) {
  71. remove_vop(a, b);
  72. }
  73. if (is_sole_member(ngbh[b], a)) {
  74. remove_vop(b, a);
  75. }
  76. if (is_sole_member(ngbh[a], b)) {
  77. remove_vop(a, b);
  78. }
  79. var edge = has_edge(a, b);
  80. var new_state = cz_table[edge ? 1 : 0][vops[a]][vops[b]];
  81. vops[a] = new_state[1];
  82. vops[b] = new_state[2];
  83. if (new_state[0] != edge){
  84. toggle_edge(a, b);
  85. }
  86. }
  87. function log_graph_state() {
  88. console.log(vops);
  89. console.log(ngbh);
  90. }
  91. add_node(0);
  92. add_node(1);
  93. act_local_rotation(0, 10);
  94. act_local_rotation(1, 10);
  95. act_cz(0, 1);
  96. log_graph_state();