Using contextual subspace reduction and DMRG-biased stabilizers, a 5-qubit VQE on IBM hardware estimated the Kagome Heisenberg ground state with 0.019% relative error.
(6) In other words, x, z track σx,σz factors in the Pauli string σ, i.e
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Simulating the Antiferromagnetic Heisenberg Model on a Spin-Frustrated Kagome Lattice with the Contextual Subspace Variational Quantum Eigensolver
Using contextual subspace reduction and DMRG-biased stabilizers, a 5-qubit VQE on IBM hardware estimated the Kagome Heisenberg ground state with 0.019% relative error.