Many-body Ramsey Spectroscopy in the Bose Hubbard Model
CQT Colloquium
Speaker: Jonathan Simon, Stanford University
Abstract:In this talk I will describe work in the Simon/Schuster collaboration exploring protocols to build and probe many body states of light. Beginning with an overview of the analogy between photons in a lattice of cavities and electrons in solids, I will focus in on our explorations of Hubbard physics in a quantum circuit, where we have demonstrated the ability to build crystals of light using reservoir engineering, and more recently, disorder-assisted adiabatic preparation of fluids. I will then extend the adiabatic preparation protocol to an ancilla-controlled protocol, where we entangle the state of the fluid with the state of the ancilla. By subsequently undoing this entanglement, and sandwiching this entanglement/disentanglement sequence within an ancilla Ramsey protocol, we are able to learn about the many body system through the ancilla. We use this new tool as a thermodynamic probe of the many body system, and even enhance its coherence through many body spin-echo. I’ll conclude with the question: can small quantum computers fundamentally change how we probe quantum matter?
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