Figure 7. Success probability of Grover’s QSA in a database with N = 1024 entries and S = 1 solution, with respect to the number of applications L of Grover’s operator , when depolarizing channels appear before and after the Oracle operator of Fig. 1, associated with p₃ = p₄ = 0.

The architecture of Fig. 2 is used. Two different depolarizing probabilities are assumed, namely p₁ = p₂ = 0.001 and p₁ = p₂ = 0.003, while the performance when Steane code is employed for cancelling the channels’ effects is compared to that of an uncoded system. The performance of the ideal Grover’s QSA is also attached as a reference.