Permuting block-sparse MPS tensors to block-diagonal form and modifying real unitary synthesis reduces Toffoli cost by factors of 10-30 for molecular systems.
Sparse quantum state preparation with improved Tof- foli cost
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New SelectCopy architecture and qubit-constrained optimizations reduce QROM Toffoli cost from ~2N/λ to ~(1 + 1/b)N/λ while preserving the ability to trade dirty qubits for lower gate count.
Two enhancements to the Grover-Rudolph algorithm reduce CNOT gates and control qubits for sparse quantum state preparation, including an approximate variant with a classically computable overlap estimate.
citing papers explorer
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Faster matrix product state preparation by exploiting symmetry-induced block-sparsity
Permuting block-sparse MPS tensors to block-diagonal form and modifying real unitary synthesis reduces Toffoli cost by factors of 10-30 for molecular systems.
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Halving the cost of QROM
New SelectCopy architecture and qubit-constrained optimizations reduce QROM Toffoli cost from ~2N/λ to ~(1 + 1/b)N/λ while preserving the ability to trade dirty qubits for lower gate count.
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Approximate Sparse State Preparation with the Grover-Rudolph Algorithm
Two enhancements to the Grover-Rudolph algorithm reduce CNOT gates and control qubits for sparse quantum state preparation, including an approximate variant with a classically computable overlap estimate.