Fig. 5: TS-QRAM simulations for protocol comparison.
a Query times for accessing a QRAM and b Fidelity of access of a QRAM for a completely probabilistic hybrid scheme (Pd = 0%) and comparison under identical efficiencies of the distribution of Bell pairs for the TD-QRAM (two-step) scheme. T1 = 2 s, T2 = 100 ms, and ϵCNOT = 0. c Query time scaling for randomly distributed deterministic nodes under the regular binary tree ordering and d and placed at higher-level steps for the linking tree, comparing between the two deterministic CNOT placement strategies for distributing the GHZ states in the TS-QRAM scheme (see Fig. 4). Notice that for the non-random placement strategy, the ratio of deterministic nodes Pd is approximately given by \({P}_{{{{\rm{d}}}}}\approx {2}^{-({\log }_{2}(N)-D)-1}\). In both cases, the efficiency of the distribution of a Bell pair was set at η = 0.5. All the error bars over the data correspond to the error of the average value over 100 simulations of the protocol.
