Figure 8

Success probability of Grover’s QSA in a database with N = 128 entries and S = 1 solution, with respect to the number of applications L of Grover’s operator , when depolarizing channels exist before and after the Oracle operator of Fig. 1, associated with p₃ = p₄ = 0, when the architecture of Fig. 2 is used.

Two different depolarizing probabilities are assumed, namely p₁ = p₂ = 0.003 and p₁ = p₂ = 0.005, while the performance when QBCH[15, 7] code is employed for cancelling the channels’ effects is compared to that of the Steane code, as well as that of an uncoded system. The performance of the ideal Grover’s QSA is also attached as a reference.