Optimally shaped terahertz pulses for phase retrieval in a Rydberg-atom data register - art. no. 033417

We employ optimal control theory to discover an efficient information-retri eval algorithm that can be performed on a Rydberg-atom data register using a shaped terahertz pulse. The register is a Rydberg wave packet with one co nsituent orbital phase reversed from the others (the "marked bit"). The ter ahertz pulse that performs the decoding algorithm does so by driving electr on probability density into the marked orbital. Its shape is calculated by modifying the target of an optimal-control problem so that it represents th e direct product of all correct solutions to the algorithm.