Projective measurement is used as a fundamental axiom in quantum
Sarah Kaiser of the Department of Physics and Astronomy will be defending her thesis:
Quantum Key Distribution Devices: How to make them and how to break them
Sarah is supervised by Associate Professor Thomas Jennewein.
Tomas Jochym-O'connor of the Department of Physics and Astronomy is defending his thesis:
Novel Methods in Quantum Error Correction
Thomas is supervised by Professor Raymond Laflamme.
In this talk, we explore how quantum information is encoded in tensor networks. To this end, we study the properties of random tensor networks with large bond dimension. We find that, from the perspective of quantum information theory, entanglement emerges from the geometry of the network by a multipartite entanglement distillation process.
I review recent results in quantum thermodynamics. This includes the emergence of many second laws at the micro-scale, fully quantum fluctuation relations for work and for states, a proof of the third law of thermodynamics applicable to erasing a bit of memory, and a grand canonical ensemble for non-commuting conserved quantities. Progress has been made using tools from quantum information theory.
When the wavefunction of a macroscopic system (such as the universe) unitarily evolves from a low-entropy initial state, we expect that it develops quasiclassical "branches", i.e., a decomposition into orthogonal components each taking well-defined, distinct values for macroscopic observables. Is this decomposition unique? Can the number of branches decrease in time?
Gate defined quantum dots are "artificial atoms", with well defined energy levels. They interact strongly with microwave resonators, and with the solid-state environment in which they live. These systems can exhibit population inversion, single-atom masing and other phenomena familiar to the quantum optics community. The environment also produces higher-order correlated decay processes, which are typically not included in quantum-optical Lindblad master equations.
In science, new advances and insights often emerge from the confluence of different ideas coming from what appeared to be disconnected research areas. The theme of my talk will review an ongoing collision between the three topics listed in my title which has been generating interesting new insights about the nature of quantum gravity, as well as variety of other fields, such as condensed matter physics and quantum field theory.
A deeper understanding of electronic transport phenomena at the nanoscale is a cross-disciplinary effort that intertwines quantum dynamics, electronic structure and statistical physics.
Jean-Philippe MacLean is in Germany discussing quantum science at the prestigious 66th Lindau Nobel Laureate Meeting.