Walkthrough ‐ Hybrid.E: Correlation

Learning Objectives

• The player is challenged to distinguish between Bell pairs and product states via measurements of each qubit.
• Key to the success of this level is the understanding that qubits in a Bell pair will always give matching results for matching measurements.

Solution

1. Both qubits from each pair are measured on the Z-axis.
2. The measurement results are compared and if found to be different (which indicates that the state was not a Bell pair) a signal 1 bit is sent to the output.
3. If no measurement differences are found then a 0 bit (set with a large delay) is output.

Level File (copy then paste into Qubit Factory)

{"name":"H.E: Correlation","tag":"quantumAdv1","version":"v1.1.2","tiles":[4,2,2,2,2,2,10,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,29,1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,21,1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,21,1,-1,24,22,22,22,44,25,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,21,1,-1,21,-1,-1,-1,-1,21,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,21,3,2,60,84,-1,-1,-1,21,-1,-1,24,22,22,22,22,22,44,22,91,-1,-1,-1,-1,-1,-1,-1,23,40,84,47,25,-1,-1,-1,-1,90,-1,-1,-1,-1,-1,-1,-1,-1,-1,24,52,22,42,26,-1,-1,-1,55,90,-1,-1,4,2,60,84,-1,-1,-1,21,-1,-1,-1,-1,-1,-1,-1,90,90,-1,-1,1,-1,21,-1,-1,-1,-1,21,-1,-1,-1,-1,-1,-1,-1,90,90,-1,-1,1,-1,23,22,22,22,44,26,-1,-1,-1,-1,-1,-1,-1,90,90,-1,-1,1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,90,90,-1,-1,1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,23,26,-1,-1,3,2,2,2,2,2,10,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1],"gates":[[6,3,"cCombine","free",0,0,0,1,-1],[6,10,"cCombine","free",0,0,0,1,-1],[18,5,"compare","free",0,0.785398163397,0,2,-1],[2,5,"measure","free",0,0,0,0,-1],[2,8,"measure","free",0,0,0,0,-1],[3,8,"trash","free",0,0.785398163397,0,0,-1],[3,5,"trash","free",0,0.785398163397,0,0,-1],[8,6,"switch","free",0,1,0,1,-1],[8,7,"cInvert","free",0,1,0,0,-1],[8,7,"cInvert","free",0,0,1,0,-1],[9,6,"trash","free",0,0.785398163397,0,0,-1],[10,6,"cCombine","free",2,0,0,0,-1],[10,6,"cCombine","free",3,0,1,0,-1],[10,7,"switch","free",2,1,0,1,-1],[16,6,"delay","free",1,0,0,7,-1],[16,5,"cCombine","free",0,0,0,0,-1],[16,7,"delay","free",1,0,0,7,-1],[16,8,"delay","free",1,0,0,7,-1],[16,9,"delay","free",1,0,0,7,-1],[16,10,"delay","free",1,0,0,7,-1],[16,11,"delay","free",1,0,0,7,-1],[15,11,"delay","free",1,0,0,7,-1],[15,10,"delay","free",1,0,0,7,-1],[15,9,"delay","free",1,0,0,7,-1],[15,7,"cCreate","free",1,0,0,0,1],[15,8,"delay","free",1,0,0,7,-1]]}