In particular, we believe that the improvements in the violation of Mermin’s inequalities are due to the availability of cNOTs among qubits 1,0 and 3,4, which were not present at the time Alsina and Latorre obtained their results. This interpretation is consistent with the fact that gate errors, readout errors, and decoherence and relaxation times were similar in the present work and in [5], and with the fact that no improvement has been obtained for the 3-qubit case.

has been cited by the following article:

• TITLE: Five Experimental Tests on the 5-Qubit IBM Quantum Computer

  AUTHORS: Diego García-Martín, Germán Sierra

  KEYWORDS: Quantum Computation, Quantum Informatio

  JOURNAL NAME: Journal of Applied Mathematics and Physics, Vol.6 No.7, July 24, 2018

  ABSTRACT: The 5-qubit quantum computer prototypes that IBM has given open access to on the cloud allow the implementation of real experiments on a quantum processor. We present the results obtained in five experimental tests performed on these computers: dense coding, quantum Fourier transforms, Bell’s inequality, Mermin’s inequalities (up to n=5) and the construction of the prime state . These results serve to assess the functioning of the IBM 5Q chips.