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quantum machine learning

Quantum-Based Modelling of Database States

127

6 Conclusion

A relational database is based on the concept of a relation [7]. A relation is deÞned as a set (set) of tuples (tuple) containing property values. A relational database itself can be seen as a set (set) of tuples (tuple) containing the name of a relation and the relation itself. Thus, the data structure of a relational database can be expressed by our recursively deÞned data type. Since a relational database is a universal data structure for modelling arbitrary real-world scenarios, our recursively deÞned concept of a data type is also universal.

In this work we focused on the two most important data type structures: the tuple and the set data type constructor. Please note that further data type constructors like list, bag, dictionary, and array can be easily simulated using the tuple and the set data type constructors, see relational database design [7].

An interesting question for further work is how to express integrity constraints in quantum mechanics. For example, how can we incorporate the concepts of uniqueness and functional dependencies into the world of quantum mechanics?

References

1.Nielsen, M. A., & Chuang, I. L. (2011). Quantum computation and quantum information: 10th anniversary edition (10th ed.). New York, NY: Cambridge University Press.

2.Schmitt, I., Ršmer, R., Wirsching, G., & Wolff, M. (2017). Denormalized quantum density operators for encoding semantic uncertainty in cognitive agents. In 2017 8th IEEE International Conference on Cognitive Infocommunications (CogInfoCom) (pp. 000165Ð000170). Piscataway: IEEE.

3.Schmitt, I. (2008). QQL: A DB&IR query language. The VLDB Journal, 17, 39Ð56.

4.Birkhoff, G., & Von Neumann, J. (1936). The logic of quantum mechanics. Annals of Mathematics, 37, 823Ð843.

5.Higham, N. J. (2009). Cholesky factorization. Wiley Interdisciplinary Reviews: Computational Statistics, 1, 251Ð254.

6.Bancilhon, F. (1997). Object-oriented databases. In A. B. Tucker (Ed.), The computer science and engineering handbook (pp. 1158Ð1170). Boca Raton, FL: CRC Press.

7.Elmasri, R., & Navathe, S. (2010). Fundamentals of database systems. Boston, MA: AddisonWesley Publishing Company.