Fall 2022

Abstract: A fundamental tenet of quantum mechanics is that measurements change a system's wavefunction to that most consistent with the measurement outcome, even if no observer is present. Weak measurements---termed partial or non-destructive in different settings---produce only limited information about the system, and as a result only minimally change the system's state. Ultracold atoms - our workhorse for quantum simulation, are an ideal platform for developing back-action limited measurements and understanding system-reservoir dynamics of large-scale many-body systems.

Abstract: Open quantum systems have been shown to host a plethora of exotic dynamical phases.

Abstract: The ability to generate, detect and manipulate photons with high fidelity is of critical importance for both fundamental quantum optics studies and practical device applications. Quantum frequency conversion, in particular, is in great demand for bridging the carrier frequency gaps in quantum networks and hybrid quantum systems. The efficiency of photon control including quantum frequency conversion is dictated by photon-photon interaction in a nonlinear optical media.

Abstract: Ultracold atom technologies have transformed our ability to perform high-precision spectroscopy and apply it to time and frequency metrology.  Many of the highest-performing atomic clocks are based on laser-cooled atoms trapped in optical lattices.  These clocks can be applied to fundamental questions, for example to improve our understanding of gravity and general relativity.  In this talk, I will discuss using lattice-trapped ultracold diatomic molecules, rather than atoms, as a reference for clocks.  Molecules have more internal quantum states and therefore are relatively chall

Abstract: In this talk, I will describe recent developments in the Simon/Schuster collaboration, where we are harnessing cavity quantum electrodynamics for both manybody physics and quantum information. I will begin with an overview of our photonic quantum materials efforts, highlighting the analogy between photons in a lattice of cavities (or family of cavity modes) and electrons in solids.

Abstract:

Abstract: Until recently, work in quantum optics focused on light interacting with bound-electron systems such as atoms, quantum dots, and nonlinear optical crystals. In contrast, free-electron systems enable fundamentally different physical phenomena, as their energy distribution is continuous and not discrete, allowing for tunable transitions and selection rules. 

Abstract: Electronic signals for precision measurements are extremely small. For periodic signals, lock-in amplifiers improve sensitivity by orders of magnitude. In this presentation, you will learn about the principles and characteristics of lock-in amplifiers and about applying them to NV center and other precision measurements.
Please email Connor Hart (chart@umd.edu) if you plan to attend. 
Location: PSC 2136

Dissertation Committee Chair: Dr. Maissam Barkeshli
Committee: 
Dr. Mohammad Hafezi (Dean’s representative)
Dr. Yi-Kai Liu
Dr. Norbert Linke
Dr. Victor Albert

Location: ATL 4402