Qudit Implementation of the Rodeo Algorithm for Quantum Spectral Filtering
The Rodeo algorithm is implemented using a general d-level ancilla qudit to analyze multi-level quantum systems. This approach uses a two-frequency interferometer kernel to perform spectral filtering and estimate entropic quantities through a single energy sweep. The method yields a Gaussian convolution of the density of states, providing an efficient framework for quantum spectral analysis and thermodynamic characterization.