Efficient Quantum Algorithms for GHZ and W States, and Implementation on the IBM Quantum Computer

Cruz, DiogoFournier, RomainGremion, FabienJeannerot, AlixKomagata, KenichiTosic, TaraThiesbrummel, JarlaChan, Chun LamMacris, NicolasDupertuis, Marc-AndreJaverzac-Galy, Clement2020-07-292020-07-292020-07-292019-06-0110.1002/qute.201900015https://infoscience.epfl.ch/handle/20.500.14299/170426WOS:000548077500008Efficient deterministic algorithms are proposed with logarithmic step complexities for the generation of entangled GHZ(N) and W-N states useful for quantum networks, and an implementation on the IBM quantum computer up to N = 16 is demonstrated. Improved quality is then investigated using full quantum tomography for low-N GHZ and W states. This is completed by parity oscillations and histogram distance for large-N GHZ and W states, respectively. Robust states are built with about twice the number of quantum bits which were previously achieved.Quantum Science & TechnologyOpticsPhysicsefficient algorithmghz statesmultipartite entanglementquantum computerquantum networksEfficient Quantum Algorithms for GHZ and W States, and Implementation on the IBM Quantum Computertext::journal::journal article::research article