JQI Seminar - Lawrence Cheuk

Speaker:   Lawrence Cheuk (Princeton University)
Title:  Exploring Many-Body Quantum Spin Physics with Molecular Tweezer Arrays
Abstract:  Optical tweezer arrays of polar molecules are a new quantum
platform that combines the richness of molecules with the microscopic
control of rearrangeable optical tweezer arrays. With molecules,
long-lived internal states combined with long-ranged electric dipolar
interactions open new possibilities in quantum simulation, quantum
information processing, and quantum metrology. Yet, experimentally,
the complexity of molecules has posed significant challenges in their
control. In the past few years, our group and others have made several
advances on this front, developing many of the one and two-particle
control capabilities required for quantum science applications. These
include high-fidelity single molecule detection, preparation of
low-defect arrays, and the control of interactions and entanglement
between pairs of molecules.

In this talk, I will report our recent work that goes beyond
two-particle physics and into the many-body regime. Specifically, I
will describe our explorations of many-body interacting spin physics
with molecular tweezer arrays. First, I will report a set of quantum
simulation experiments probing coherent spin dynamics in 1D 1/r^3
XXZ/XYZ spin chains realized with Floquet Hamiltonian engineering.
Through quench dynamics, we reveal a variety of phenomena including
coherent quantum walks of single magnons, emergence of two-magnon
bound states, and coherent creation and annihilation of spin pairs.
Next, I will describe work where we explore many-body spin physics
through the lens of quantum-enhanced metrology. Using XXZ spin models
in 1D, we create metrologically useful many-body entangled states of
molecules for the first time . Specifically, I will describe how we
create spin-squeezed states and demonstrate their metrological
advantage. I will discuss several aspects of these states that we have
observed, including the structure of squeezing correlations and
bipartite entanglement. Lastly, if time permits, I will briefly
describe ongoing work on scaling up molecular tweezer arrays.

*You will need to bring your cell phone, so you can sign in using the QR code outside of ATL 2400.  You will need to submit your first and last name, email, and affiliation on the form by 11:15am to be able to get lunch after the seminar.  Lunch is first come, first served.*

At 4pm, there will be a tea in ATL 2117 for our speaker and students/postdocs - this is a chance to ask questions directly to our speaker. Refreshments will be served.