- American Physical Society Sites
- Meetings & Events
- Policy & Advocacy
- Careers In Physics
- About APS
- Become a Member
Title: Exploring Quantum Physics with Trapped Ions
Abstract: Trapped ions were among the first systems, where a single quantum particle can be confined and manipulated in almost perfect isolation from its environment. This makes ions prime candidates for high precision experiments and for demonstrating textbook quantum mechanical principles. Several ions in the same trap can couple strongly to each other through their Coulomb interaction. This enables entangling quantum logic gates and as a consequence, many experiments with trapped ions have concentrated on advancing quantum information processing in the last 20 years. While much work still needs to be done before a scalable, fault tolerant universal quantum processor can be realized in any system, the advances with ions have enabled exploration of new avenues, such as quantum simulation, quantum logic spectroscopy for ion clocks, and for molecular ion and highly charged ion spectroscopy. Lately, ion-based sensors and ideas for hybrid quantum systems that aim to couple trapped ions to photons, neutral atoms, superconducting circuits, micro-mechanical oscillators or other quantum coherent entities are gaining momentum.
Reference: R. Blatt and D. Wineland, Entangled states of trapped atomic ions, Nature 453, 1008 (2008)
Title: What will we do with a quantum computer?
Abstract: We have entered exciting times where first small quantum computers have been developed and become accessible to scientists. It is now timely to ask what problems they can be used for, and where they will play out their strengths to solve interesting classically intractable problems. Starting with an overview of quantum algorithms and how quantum mechanics can speed up computations, I will discuss the steps one needs to take to turn a quantum algorithm into a successful quantum application. I will argue that in parallel to hardware development a strong complementary effort in quantum software is needed to realize the potential of quantum computers. This offers a wide range of opportunities to students with a background in both quantum physics and computing.
Title: Optical studies of current-induced magnetization switching and photonic quantum states
Abstract: The ever-decreasing size of electronic components is leading to a fundamental change in the way computers operate, as at the few-nanometer scale, resistive heating and quantum mechanics prohibit efficient and stable operation. One of the most promising next-generation computing paradigms is Spintronics, which uses the spin of the electron to manipulate and store information in the form of magnetic thin films. I will present our optical studies of the fundamental mechanisms by which we can efficiently manipulate magnetization using electrical current. Although electron spin is a quantum-mechanical property, Spintronics relies on macroscopic magnetization and thus does not take advantage of quantum mechanics in the algorithms used to encode and transmit information. For the second part of my talk, I will present our work under the umbrella of new computing and communication technologies based on the quantum mechanical properties of photons. Quantum technologies often require the carriers of information, or qubits, to have specific properties. Photonic quantum states are good information carriers because they travel fast and are robust to environmental fluctuations, but characterizing and controlling photonic sources so the photons have just the right properties is still a challenge. I will describe our work towards enabling quantum-physics-based secure long-distance communication using photons.
Reference: B. Fang, O. Cohen, M. Liscidini, J. E. Sipe, and V. O. Lorenz, "Fast and highly resolved capture of the joint spectral density of photon pairs," Optica 1, 281–4 (2014).
Title: A fermionic simulator with ultracold atoms in engineered optical potentials
Abstract: In this talk I will show how our ultra-cold atom experiment will eventually simulate paradigmatic topological matter (fractional Chern insulators), black holes, and the electronic structure of molecules. Our experiment employs fermionic strontium atoms in engineered optical potentials, specifically optical lattices and tweezers. This system offers single-atom imaging and manipulation, fermionic statistics, as well as the same exquisite control of the internal electronic states of the atoms offered by trapped ions, used as a quantum computing architecture.
Reference: "Quantum Computing with Alkaline-Earth-Metal Atoms," A. Daley, M. Boyd, J. Ye and P. Zoller, Phys. Rev. Lett. 101, 170504 (2008)