On the nature of the Josephson effect in topologically nontrivial materials
Dissertation Committee Chair: Prof. James Williams
Committee:
Prof. Alicia Kollàr
Prof. Johnpierre Paglione
Prof. Frederick Wellstood
Prof. Ichiro Takeuchi
Abstract:
ANALOGUE COSMOLOGY EXPERIMENTS WITH SODIUM BOSE EINSTEIN CONDENSATES
Dissertation Committee Chair:
Professor Steven Rolston (Chair)
Dr. Gretchen Campbell (Co-Chair)
Committee:
Professor Steven Rolston
Dr. Gretchen Campbell
Dr. Ian Spielman
Professor Mohammad Hafezi
Professor Rajarshi Roy
Abstract:
Sensing with optical and acoustic waves
In this seminar, I will discuss several recent and ongoing experimental efforts in the Purdy Lab (which specializes in quantum sensors and transducers with optical, mechanical, and microwave systems), with a focus on some often overlooked or least under-appreciated aspects of relatively simple measurements. We have recently completed the first detailed study of acoustic blackbody radiation interacting with a nanomechanical system. While the acoustic equivalent of the well-known electromagnetic blackbody radiation should be equally ubiquitous, there have been almost no experiment
Experimental Atomic Spectroscopy of Iron Group Elements for Astrophysics
Dissertation Committee Chair: Steve Rolston
Committee:
Gillian Nave
Trey Porto
Ronald Walsworth
Wendell Hill
Electronic Transport in PbSnTe Josephson Junctions and ZrTe5 nanowires
Dissertation Committee Chair: Dr. James Williams
Committee:
Dr. Gretchen Campbell
Dr. Alicia J. Kollar
Dr. Frederick C. Wellstood
Dr. Ichiro Takeuchi (Dean's Rep)
Engineering Topological Quantum Matter with Patterned Light
Dissertation Committee Chair: Mohammad Hafezi
Committee:
Maissam Barkeshli
Michael Gullans
Trey Porto
Ronald Walsworth
John Cumings
The Most Coherent Superconducting Qubit?
To realize a digital quantum processor based on superconducting qubits, gate error rates must be further reduced by raising coherence times and increasing anharmonicity. I report our group's progress in improving coherence and control of fluxonium superconducting qubits by optimizing the circuit's spectrum and enhancing fabrication methods.
The fine structure of quantum spin ice
Abstract: Quantum spin liquids are low temperature phases of magnetic materials in which quantum fluctuations prevent the establishment of long-range magnetic order. These phases support fractionalized spin excitations (spinons) coupled to emergent photons. In this talk, I will review the basic picture of how quantum electrodynamics emerges in 3D spin ice and then turn to several results regarding its `fine structure'.
All-optical coherent control of solid-state spin qubits toward quantum photonic applications
Abstract: Optically-active spins in the solid-state are useful resources for quantum technologies. The coupling of such systems to photonic structures can generate deterministic spin-photon entanglement, which could contribute to quantum simulations and networking. Ideal spin systems for such applications must combine high quality spin and photonic properties, as well as efficient methods for the coherent manipulation of the spin state.
"Distinguishing between quantum and classical Markovian dephasing dissipation"
Abstract: Understanding whether dissipation in an open quantum system is truly quantum is a question of both fundamental and practical interest. We consider a general model of n qubits subject to correlated Markovian dephasing, and present a sufficient condition for when bath-induced dissipation can generate system entanglement and hence must be considered quantum. Surprisingly, we find that the presence or absence of time-reversal symmetry (TRS) plays a crucial role: broken TRS is required for dissipative entanglement generation.