Number of occurrences

What might be a source of a problem if one gets the number of occurrences to be  1 for all 100 samples ? 

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  • Hi Ahmed,

    The results you're getting are not always an indication of an error, sometimes it is a characteristic of the problem itself or how the problem was formulated. The QPU returns probabilistic solutions (or a distribution over low energy states).

    That being said, there are certain factors or problem characteristics that can cause the behavior you're seeing such as

    • Random linear and quadratic biases 
    •  A high chain strength value 
    •  Large problems with linear and quadratic terms that vary by many orders of magnitude (for example, 2x + 5y - 100000xy)
    •  Large clusters of low energy states in the solution space, especially when the size of the cluster is much larger than the number of reads 

    It is difficult to give a concrete answer without knowing more about your problem and how it was formulated. 

    What problem are you trying to solve on the QPU and what results are you expecting to see? If you could share a code snippet or a link to a public git repository that would be great.

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  • Hi Alex,

    Thanks for your help on this issue. We are working on solving the Traveling Salesman Problem using the DWAVE Advantadge_system4.1. We have using the QUBO formulation built in https://www.frontiersin.org/articles/10.3389/fict.2019.00013/full

    We have the same problem as Ahmed depicted, which basically consist on having a very sparse distribution of results (despite the DWAVE computer reaches the optimum result). Where can we found information about this issue and how to solve it? Is there any documentation or paper which we can read?

    Many thanks in advance.

    Best regards,

    Eneko.

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