Tunneling in Quantum Adiabatic Optimization
This talk will address several aspects of tunneling when attempting quantum adiabatic optimization (QAO). First, I derive how the width and height of potential barriers affect the minimal spectral gap of the QAO algorithm. This derivation uses elementary techniques and confirms and extends an unpublished folklore result by Goldstone. Next,
Drainage solutions for quantum systems
Lindbladians, one of the simplest extensions of Hamiltonian-based quantum mechanics, are used to describe “drainage” (i.e., decay) and decoherence of a quantum system induced by the system's environment. While traditionally viewed as detrimental to fragile quantum properties, a tunable environment offers the ability to drive the system toward exotic phases of matter, which may be difficult to stabilize in nature, or toward protected subspaces, which can be used to store and process quantum information.
Scattering and quantum information
In high energy and gravitational physics, the S-matrix is the starting point for studying any fundamental physics in asymptotically flat spacetimes. In the context of information theory, the S-matrix can be viewed simply as one of many possible unitary time evolution operators. I'll give some simple examples highlighting the overlap of these views; in particular, I will discuss the interplay of entanglement with relativistic scattering.
Truly quantum Gibbs: Thermal state of a system whose charges don’t commute
The grand canonical ensemble lies at the core of statistical mechanics. A small system thermalizes to this state while exchanging heat and particles with a bath. A quantum system may exchange quantities, or “charges,” represented by operators that fail to commute. Whether such a system thermalizes, and what form the thermal state has, concerns truly quantum thermodynamics.
Disorder-induced quantized pumping in a Floquet topological phase
Lunch served at 12:00
Realizing quantum advantage without entanglement in single-photon states
Lunch served at 12:00
Quantum Discord expresses quantum correlations beyond those associated with entanglement. Although its theory has been extensively studied, quantum discord has yet to become a standard tool in experimental studies of correlations. We propose an optical circuit for attaining quantum measurement advantage in a system that has no quantum entanglement. Our device
Shortcuts to quantum network routing
Lunch served at 12:00
A Classical Network Protocol to Support Distributed Quantum State Tomography
This research presents the design of a classical networking protocol that supports distributed quantum state tomography, which provides necessary information for quantum error correction to work properly.
Also, the main audience would be familiar with classical communication, but not with quantum physics, because the conference focuses on classical networking as a whole. Therefore the paper provides some of the backgrounds on quantum communication as well.
What does the Moser-Tardos RESAMPLE algorithm do when it does not work?
The celebrated Lovasz Local Lemma (LLL) guarantees that locally sparse systems always have solutions, which one can also algorithmically find by the Moser-Tardos RESAMPLE algorithm. Among the major questions that remain open is that how far *beyond* Lovasz's condition can we expect that RESAMPLE still performs in polynomial (linear) expected running time? Stating the question correctly is a challenge already. For a solvable and fixed instance RESAMPLE always comes up with a solution, but the catch is that the number of steps may be very large.