Amir Hosein Ghadimi

PhD

quantum world

  Halls department, Hall 5
  Thursday, 27 December 2018
  09:00 - 10:00

Abstract

In the past few years, we have witnessed a major interest by many individuals and companies such as google, IBM and Intel among others to harness the immense capacities of the "quantum world"; and use them to our advantage for computation purposes. These signals a paradigm-shift for the future computer science and secure communication, where new challenges and exciting opportunities will emerge for the next generations of computer scientists. These opportunities invites a special care and dedication from every young student in this field to familiarize themselves with these novel concepts that could potentially revolutionaries and shapes the future of computer science and communication. In this talk, we are intended to briefly review some basics and state of the art in the field of "quantum computing" and "quantum communication".

What is commonly known as quantum computers and quantum communication today, is the result of extensive efforts by several generations of scientist to understand the fundamentals of quantum mechanics. These platforms take advantage of parallel interaction between "quantum bits" – also known as Qbit – in order to deliver efficient and novel approaches for some of the computational tasks that are either impossible or extremely difficult to access or solve via classical computers. This opens a new era in computer science that not only to extend and strengthen our current computational capabilities but also paves the way for an unexplored regime that previously was not accessible with classical computers. In addition, quantum laws can be used in secure communication. Over the past years, scientist introduced several communication protocols that are "impossible to hack". In these protocols, the security is guaranteed by the fundamental laws of quantum mechanics. These mostly theoretical achievements have raised a significant interest among many researchers, private companies and funding initiatives around the world in order to realize a working prototype for quantum computer and quantum communication.

In this talk, we will review some of the basics of quantum computers and quantum communication protocols and their advantages compare to classical computers and discuss the experimental challenges in creating these platforms. We start by reviewing some basics about quantum mechanics, especially how quantum computers and quantum communication protocols are deeply connected to the concepts of entanglement and act of measurements in quantum mechanics. Then we briefly review the building blocks of quantum computers, known as "quantum gates" and the basic architecture of quantum computers. In the next step, we discuss how quantum computers can solve some class of computational tasks in a more efficient way by taking advantages the parallel interactions in their large Hilbert space and briefly introduce the Shor's algorithm as an example. At last, we briefly review some of the experimental challenges in construction of the quantum computers and especially discuss how temperature pose a fundamental limit on quantum computers via the process of thermal decoherence. Finally, we briefly tap into several experimental realizations such as superconducting circuits, trapped atoms and ions, which were studied as the main platforms for the quantum computers by the researchers.

Bio

Amir Hossein Ghadimi is currently a post-doctoral researcher at the Swiss Center for Micro and nano-technology (CSEM) in Switzerland. He recently obtained his Ph.D. in electrical engineering in 2018 from the Swiss Federal Institute of Technology (EPFL). He received his first B.Sc. in Electrical Engineering and second B.Sc. in Physics from Sharif University of Technology in 2012. His research focuses on quantum optics, quantum computers and quantum memories, quantum optomechanics and precision sensing. His Ph.D. work has been highlighted by several high impact publications such Science (2018) and Nature (2015). He is the recipient of CSEM post-doc for industry fellowship (2018), Swiss Nanotechnology best PhD award (2018) and European frequency and time forum (EFTF) best paper award (2018).