JILA Public Seminar

Computer-generated holography for optical trapping and imaging

Hello JILAns,

You are invited to a reception and talk for Monika Ritsch-Marte on Thurs, July 18th at 3:30 pm in the h-bar.  Please join us to welcome Prof. Ritsch-Marte.


3:30 reception in h-bar

4:00 talk in X317



Computer-generated holography for optical trapping and imaging


Monika Ritsch-Marte

Division for Biomedical Physics, Medical University of Innsbruck, Austria


Fast and mixed-species entangling gates with trapped ions

Trapped ion qubits are one of the most promising candidates for scalable quantum computing. Entangling gates with trapped ions are typically performed in an adiabatic regime, where the motional frequencies of the ions in the trap limit the gate speed. Following [1] we use amplitude-shaped cw-pulses to perform entangling gates significantly faster than the speed limit for conventional gate mechanisms. At these gate speeds, the motional modes are not spectrally isolated, leading to entanglement with both motional modes sensitively depending on the optical phase of the control fields.

Driven-dissipative systems: A critical tale of nonequilibrium phenomena

Non-equilibrium driven-dissipative systems, characterized by a fast external drive as well as a coupling to a dissipative bath, are not only relevant to a vast range of experimental platforms, but also pose fundamental questions about the nature of non-equilibrium states and dynamics. In this talk, I give an overview of such systems, and will argue that an effective thermal behavior often emerges in these systems. Nevertheless, I will discuss a driven-dissipative system of interacting bosons that exhibits remarkable nonequilibrium (i.e., non-thermal) behavior.

Topology of the Rashba model (Experiment) and quantum gases with weak measurement and classical feedback (Theory)

(1) We experimentally realized Rashba spin–orbit with 87-Rb in the F=1 ground state manifold by Raman coupling three `synthetic clocks states’ generated by a continuous dynamical decoupling scheme.  We use Fourier transform spectroscopy to directly reveal the Dirac point and construct a three-arm Ramsey interferometer to read out the associated singular Berrys curvature.

Variational generation of spin-squeezed states on programmable quantum simulators

As the current improvement of precision sensors technology is rapidly approaching the standard quantum limit, it becomes fundamental to reliably generate entangled states useful for quantum metrology, such as spin-squeezed states, on controllable quantum many-body platforms. I will discuss variational techniques between a programmable analog quantum simulator and a classical optimization algorithm by considering a system of strontium atoms, trapped in optical tweezers and interacting via Rydberg-dressing to generate spin squeezed states.

OTOCs and topological invariants from statistical correlations of randomized measurements

Recently, statistical correlations of randomized measurements have emerged as a new tool to probe properties of many-body quantum states beyond standard observables. Here, I focus on locally randomized measurements in spin models, implemented by the application of local random unitaries and a subsequent measurement in a fixed basis. I will discuss two applications: First, I'll present a protocol to measure out-of-time ordered correlation functions (OTOCs), without the necessity of implementing time reversed operations or ancilla degrees of freedom.

An Overview of Quantum Computing at IBM: IBM-Q

Quantum computing has developed from mathematical applications of fundamental quantum mechanics to the realization of an actual multiple qubit computational platform, called IBM-Q, that is accessible to external users. I will give an overview of quantum computing methodologies but focus more specifically on IBM’s approach utilizing Josephson Junctions imbedded in resonator structures that operate at 10 mK. In addition to discussing the mathematical basis of quantum computing, I’ll describe several key quantum gates and how they are implemented in a quantum computer.

Explorations of Fundamental Material & Photochemistry Processes: A New Laboratory

KMLabs and IMEC have partnered to create a new laboratory to explore fundamental material and photochemistry processes critical for scaling in the 300B$ semiconductor industry.  The foundation of semiconductors is the lithography process use to create the individual patterns on chips, and the next generation 13.5nm lithography systems are limited by the photochemistry of these systems.  To address, a set of both old and new techniques are being created in a system to investigate photochemistry for EUV lithography: the fundamental nature of EUV exposure is very different, and fundamentally l