Dynamic codes and quantum computation
I will review the concept of Floquet quantum error-correcting codes, and, more generally, dynamic codes. These codes are defined through sequences of low-weight measurements that change the instantaneous code in time and enable error correction. I will explain a few viewpoints on these codes, including state teleportation and anyon condensation, and will explain how to implement gates purely by adjusting the sequences of low-weight measurement.
Aspects of Unconventional Transport and Quasiparticle in Condensed Matter Systems
Dissertation Committee Chair: Jay Sau
Committee:
Steven Anlage
Christopher Jarzynski
Johnpierre Paglione
Victor Yakovenko
Fast scrambling transitions and their applications in quantum simulators
Abstract: In many-body systems of cold atoms and their applications to quantum metrology and quantum computing, there are important questions around how large an entangled many-body state we can usefully and reliably prepare in the presence of decoherence. Information spreading and entanglement growth are typically limited by Lieb-Robinson bounds, so that the useful system size with short-range interactions will grow only linearly with the coherence time.
Giant Artificial Atoms and Molecules: Chiral (Directional) Photon Emission via Waveguide QED
Abstract: In this talk, we present a demonstration of “giant artificial atoms” realized with superconducting qubits in a waveguide QED architecture. The superconducting qubits couple to the waveguide at multiple, well-separated locations. In this configuration, the dipole approximation no longer holds, and the giant atom may quantum mechanically self-interfere. Multiple, interleaved qubits in this architecture can be switched between protected and emissive configurations, while retaining waveguide-mediated qubit-qubit interactions.
Fundamental Physics and Quantum Science with Polyatomic Molecules
Abstract: Polyatomic molecules uniquely enable the simultaneous combination of multiple features advantageous for precision measurement and quantum science. Searches for fundamental symmetry violations benefit from large internal molecular fields, high polarizability, internal co-magnetometry, and the ability to cycle photons - all of which can be found in certain engineered polyatomic species. We discuss experimental and theoretical developments in several linear metal hydroxide (MOH) species, including spectroscopy, photon cycling, andquantum control.
Hamiltonian engineering of spin-orbit–coupled fermions in an optical lattice clock
Abstract: Harnessing the behavior of complex systems is at the heart of quantum technologies. Precisely engineered ultracold gases are emerging as a powerful tool for this task. In this talk I will explain how ultracold alkaline-earth atoms (AEAs) trapped by light used to create optical lattice clocks are not only fascinating, but of crucial importance since they can help us to answer cutting-edge questions about complex many-body phenomena and magnetism.
Probing critical states of matter on a quantum computer
Abstract: I will describe Quantinuum’s trapped ion QCCD quantum computers, with a particular focus on the key technical challenges and solutions for realizing mid-circuit measurement and reuse of qubits. In addition to the importance these capabilities play in quantum error correction, they also afford remarkable efficiencies in simulating many-body physics, enabling explorations of physics at length scales well beyond the limits that would be naively guessed from the size of present-day quantum computers.
CANCELLED: Quantum super impulses
Abstract: A quantum impulse is a brief but strong perturbation that produces a sudden change in a wavefunction.
Measuring the knots & braids of non-Hermitian oscillators
Abstract: It may seem unlikely that rich mathematical structures remain to be uncovered in classical harmonic oscillators. Nevertheless, systems that combine non-reciprocity and loss have provided a number of surprises in recent years. I will describe how these systems naturally exhibit braids, knots, and other topological structures. I will also present measurements of these structures (using a cavity optomechanical system), and will describe their potential application in various control schemes.
CANCELLED: Programmable control of indistinguishable particles: from clocks to qubits to many-body physics
Abstract: Quantum information science seeks to exploit the collective behavior of a large quantum system to enable tasks that are impossible (or less possible!) with classical resources alone. This burgeoning field encompasses a variety of directions, ranging from metrology to computing. While distinguished in objective, all of these directions rely on the preparation and control of many identical particles or qubits. Meeting this need is a defining challenge of the field.