Matrix product channel: Variationally optimized quantum tensor network to mitigate noise and reduce errors for the variational quantum eigensolver

Understand

Quantum processing units boost entanglement at the level of hardware and enable physical simulations of highly correlated electron states in molecules and intermolecular chemical bonds.

• The variational quantum eigensolver provides a hardware-efficient toolbox for ground state simulation; however, with limitations in precision.
• Even in the absence of noise, the algorithm may result into a biased energy estimation, particularly with some shallower ansatz types.
• Noise additionally degrades entanglement and hinders the ground state energy estimation (especially if the noise is not fully characterized).