Quantum algorithm estimates fidelity of commuting mixed states using density matrix exponentiation and interferometry with time complexity O(κ²N²/ε⁷).
The algorithm involves another DME onχ, followed by IQPE, to estimate 5 λ
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Efficient algorithm for fidelity estimation of two quantum states
Quantum algorithm estimates fidelity of commuting mixed states using density matrix exponentiation and interferometry with time complexity O(κ²N²/ε⁷).