New method maps complex circuit noise into quantum Hamiltonian models

Researchers from Yale University, Fermi National Accelerator Laboratory, and Northwestern University have developed new techniques to map complex circuit noise into quantum Hamiltonian models. The work addresses a critical need for accurate time-dependent models of microwave-driven Josephson circuits, essential components in building functional quantum computers. Unlike existing methods that excel at modeling static Hamiltonians, this approach accounts for both the intended electromagnetic drives and the inevitable noise entering these systems. The team’s techniques efficiently translate microwave simulations into Hamiltonian models without relying on simplified circuit descriptions, allowing characterization of realistic devices in complex electromagnetic environments. The team’s approach allows for the creation of time-dependent Hamiltonian models, crucial for predicting circuit dynamics and designing high-fidelity quantum operations. These models go beyond the limitations of existing methods…