Efficient quantum phase estimation with adaptive entanglement-assisted Hadamard test
The Adaptive Entanglement-Assisted Hadamard Test (AEHT) is a method for high-precision quantum phase estimation that improves upon standard tests by iteratively refining a reference phase. This allows for progressively stronger amplification, reducing the required device restarts from O(1/ϵ^2) to O(1/ϵ) in hardware-unconstrained settings, offering better performance on near-term quantum hardware.