Realizing Negative Quantum States with the IBM Quantum Hardware

This study explores robust entangled states described using the framework of discrete Wigner functions. Notably, these states are known to outperform the Bell state in measures of entanglement in the presence of non-Markovian noise. Our study focuses on methods for preparing these states using quantum circuits that can be natively implemented on superconducting hardware and testing the efficacy of these methods on IBM's quantum device. We present quantum circuits for state preparation and validate them through tomographic reconstruction on the real IBM quantum hardware. We propose a teleportation scheme that leverages these entangled states as a resource. We believe that these entangled states have the potential to be used in place of the traditional Bell state in scenarios where non-Markovian errors are prevalent.