W50: Quantum Simulation of Many-Body Physics

Thu. March 7, 3:36 p.m. – 3:48 p.m. CST

200H

Quantum simulation with superconducting qubits has largely focused on models of two-level systems such as the hard-core Bose-Hubbard model. However, this choice massively truncates the size of the accessible Hilbert space – reducing the complexity of computation and preventing quantum information from being stored in the higher levels of the system. In this talk, we will discuss the feasibility of performing multi-level analog quantum simulation of the Bose-Hubbard model using superconducting transmon qudits. This approach offers several advantages, including efficient emulation of time evolution, reduced leakage from the computational subspace, and a wider range of Hamiltonian parameter values represented by the model. However, with these improvements comes increased complexity in readout and tomography protocols. We will give an overview of the design and control of transmon-based Bose-Hubbard emulators. We consider contributions to decoherence and decay of these higher excited states and discuss their impact on many-body behavior. Finally, we will give an outlook for future experiments as we move towards meaningful quantum advantage on noisy intermediate-scale quantum hardware.