Amir Hosein Ghadimi
Advancements and challenges in quantum computers and quantum networks
Halls department, Hall 4
Wednesday, 28 December 2016
15:00 - 16:00
Over the past few decades, from a long-standing effort by generations of scientist trying to understand the fundamentals of quantum mechanics, new concepts have emerged which is known as quantum computers and quantum networks. These platforms take advantage of parallel interaction between quantum two-level systems – known as quantum bits (qbit) – in order to deliver efficient and novel techniques for some of the computational tasks that are either impossible or extremely difficult to solve via classical computers. This opens a new era in computer science not only to extend our computational capabilities but also paves the way for an unexplored regime that previously was not accessible with classical computers. On the other hand, quantum laws can be used in secure communication. Over the past years, scientist introduced several communication protocols that are impossible to hack and its security is guaranteed by the fundamental laws of quantum mechanics. These mostly theoretical achievements have raised interest among many researchers around the world in order to realize the quantum computers and quantum communication. In this talk, we will review some of the basics of quantum computers and quantum communication protocol and their advantages compare to classical computers and finally discuss the experimental challenges in creating these platforms. In this talk, 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 working principles 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 of their large Hilbert space and briefly introduce the Shor’s algorithm as an example. Next, we review some of the experimental challenges in building the quantum computers and especially discuss how temperature pose a fundamental limit on quantum computers via the process of thermal decoherence. Next, we briefly introduce several experimental platforms such as superconducting circuits, atom trapping and etc. which was studied by researchers in recent years. Finally, we will see in more details how nano-mechanical oscillator can play a role as a novel platform for some applications in quantum computer domain such as quantum memories and quantum transducers.
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).