Seminar

Takashi Imai, McMaster University

NMR (Nuclear Magnetic Resonance) is a versatile probe of condensed matter, and has a broad range of applications in chemistry, medicine (MRI), oil industry, etc. NMR has become so popular outside the conventional realm of physics that the crucial role NMR has been playing in condensed matter physics is sometimes overlooked. I will explain how condensed matter physicists use NMR as a powerful low energy probe of solids, drawing examples from modern research into statistical physics, magnetism, and superconductivity.

Volkher Scholz, Institute for Theoretical Physics ETH Zurich

We derive new Heisenberg-type uncertainty relations for both joint measurability and the error- disturbance tradeoff for arbitrary observables of finite-dimensional systems. The relations are formulated in terms of a directly operational quantity, namely the probability of distinguishing the actual operation of a device from its hypothetical ideal, by any possible testing procedure whatsoever.

Layla Hormozi, National University of Ireland

A topological quantum computer is a hypothetical device in which intrinsic fault-tolerance is embedded in the hardware of the quantum computer. It is envisioned that in these devices quantum information will be stored in certain topologically ordered states of matter and quantum computation will be carried out by braiding the world-lines of quasiparticle excitations that obey non-Abelian statistics, around one another, in specific patterns.

Jingyun Fan, National Institute of Standards and Technology

Measurements based on the quantum properties of physical system have enabled many tasks which are not possible by any classical means. In this talk, I introduce two quantum receivers that discriminate nonorthogonal optical coherent states unconditionally surpassing the standard quantum limit, with mean photon numbers ranging from single photon level to many photons, thus bridging the gap between quantum information technology and state-of-the art coherent communications.

Xiaodong Xu, The University of Washington

Electronic valleys are extrema of Bloch energy bands in momentum space. Having multiple valleys gives the electron states pseudospin degrees of freedom in addition to their real spin. In this talk, I will discuss our experimental progress on the investigation of spins and pseudospins using atomically thin semiconductors, which are either single or bilayer group VI transition metal dichalcogenides.

Fernando Pastawski, California Institute of Technology

In this talk I will focus on dissipative dynamics as a model for quantum information processing (QIP). Arguably, some form of open system description is required in order to model large experimental systems which inevitably exchange information with their environment. Lindblad master equations allow describing the effect of the environment to first non-trivial order. Within such a model, it becomes natural to design forms of dissipation, where the environment is engineered to aid or perform a QIP task.

Michael Reimer, Delft University of Technology, Netherlands

Guillermo Esteban Romero Huenchuir, University of Basque Country, Spain

In this talk, I will present my past, present, and new projects in the field of circuit quantum electrodynamics. First, I will show a proposal for microwave photodetection and how it has influenced our community to develop experiments and further theoretical developments. Second, I will show the first theoretical proposal of circuit QED with a quantum point contact as a two-level system.

Francois Le Gall, The University of Tokyo

In this talk I will describe recent progresses in the development of quantum algorithms for matrix multiplication. I will start with the case of Boolean matrices, and discuss the time complexity and query complexity of Boolean matrix multiplication in the quantum setting.

Dr. Jianming Cai, Universität Ulm

Color centers are atomic defects in diamond that possess electronic and nuclear spins.
The rapid progress of experiments with color centers in diamond indicates that
they are promising systems for quantum information processing, and more important for quantum
sensing (imaging) under ambient conditions.