Fig. 2: Resource estimates of sparse qubitization in first and second quantization for \({[{{\rm{Fe}}}_{2}{{\rm{S}}}_{2}]}^{2-}\) with 14 electrons, varying the number of orbitals.
From: Quantum simulations of chemistry in first quantization with any basis set
Resource estimates were obtained for the target accuracy ϵtot = 0.1 mHa for ground state energy estimation. a Second quantization requires fewer Toffoli gates for all data points, but first quantization scales better in D. b Only the last three points were used for the fit of logical qubits. First and second quantization require a similar number of logical qubits.
