Bulletin of the American Physical Society
2013 Joint Meeting of the APS Division of Atomic, Molecular & Optical Physics and the CAP Division of Atomic, Molecular & Optical Physics, Canada
Volume 58, Number 6
Monday–Friday, June 3–7, 2013; Quebec City, Canada
Session H7: Invited Session: DAMOP Thesis Prize |
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Chair: David Hall, Amherst College Room: 303 |
Wednesday, June 5, 2013 10:30AM - 11:00AM |
H7.00001: Investigations of Memory, Entanglement, and Long-Range Interactions Using Ultra-Cold Atoms Invited Speaker: Yaroslav Dudin Long-term storage of quantum information has diverse applications in quantum information science. I have employed ultra-cold rubidium atoms confined in one-dimensional optical lattices to demonstrate entanglement between a light field and a long-lived spin wave, to develop light-shift compensated quantum memories, to create entanglement between a telecom-band light field and a light-shift compensated memory qubit of a 0.1 s lifetime, and to store coherent light pulses with 1/e lifetime of 16 s in a magnetically-compensated lattice augmented by dynamic decoupling. Highly excited Rydberg atoms offer a unique platform for study of strongly correlated systems and quantum information, because of their enormous dipole moments and consequent strong, long-range interactions. I will present experimental studies of single collective Rydberg excitations created in a cold atomic gas including first realization of a Rydberg-atom-based single photon source, measurement of entanglement between a Rydberg spin wave and light, investigations of long-range correlations of strongly interacting Rydberg spin waves, and initial observations of coherent many-body Rabi oscillations between the ground level and a Rydberg level using several hundred cold rubidium atoms. [Preview Abstract] |
Wednesday, June 5, 2013 11:00AM - 11:30AM |
H7.00002: Photonic Quantum Computing Invited Speaker: Stefanie Barz Quantum physics has revolutionized our understanding of information processing and enables computational speed-ups that are unattainable using classical computers. In this talk I will present a series of experiments in the field of photonic quantum computing. The first experiment is in the field of photonic state engineering and realizes the generation of heralded polarization-entangled photon pairs. It overcomes the limited applicability of photon-based schemes for quantum information processing tasks, which arises from the probabilistic nature of photon generation. The second experiment uses polarization-entangled photonic qubits to implement ``blind quantum computing,'' a new concept in quantum computing. Blind quantum computing enables a nearly-classical client to access the resources of a more computationally-powerful quantum server without divulging the content of the requested computation. Finally, the concept of blind quantum computing is applied to the field of verification. A new method is developed and experimentally demonstrated, which verifies the entangling capabilities of a quantum computer based on a blind Bell test. [Preview Abstract] |
Wednesday, June 5, 2013 11:30AM - 12:00PM |
H7.00003: Artificial Gauge Fields for Ultracold Neutral Atoms Invited Speaker: Karina Jimenez-Garcia Ultracold atoms are a versatile probe for physics at the core of the most intriguing and fascinating systems in the quantum world.~Due to the high degree of experimental control offered by such systems, effective Hamiltonians can be designed and experimentally implemented on them.~This unique feature makes ultracold atom systems ideal for quantum simulation of complex phenomena as important as high-temperature superconductivity, and recently of novel artificial gauge fields. Suitably designed artificial gauge fields allow neutral particles to experience synthetic- electric or magnetic fields; furthermore, their generalization to matrix valued gauge fields leads to spin-orbit coupling featuring unprecedented control in contrast to ordinary condensed matter systems, thus allowing the characterization of the underlying mechanism of phenomena such as the spin Hall effect and topological insulators. In this talk, I will present an overview of our experiments on quantum simulation with ultracold atom systems by focusing on the realization of light induced artificial gauge fields.~We illuminate our Bose-Einstein condensates with a pair of far detuned ``Raman" lasers, thus creating dressed states that are spin and momentum superpositions. We adiabatically load the atoms into the lowest energy dressed state, where they acquire an experimentally-tunable effective dispersion relation, i.e. we introduce gauge terms into the Hamiltonian.~We control such light-induced gauge terms via the strength of the Raman coupling and the detuning from Raman resonance. Our experimental techniques for ultracold bosons have surpassed the apparent limitations imposed by their neutral charge, bosonic nature, and ultra-low energy and have allowed the observation of these new and exciting phenomena.~Future work might allow the realization of the bosonic quantum Hall effect, of topological insulators and of systems supporting Majorana fermions using cold atoms. [Preview Abstract] |
Wednesday, June 5, 2013 12:00PM - 12:30PM |
H7.00004: Quantum simulation of many-body physics with neutral atoms, molecules, and ions Invited Speaker: Michael Foss-Feig The achievement of quantum degeneracy in alkali vapors has enabled the simulation of iconic condensed-matter models. However, ultracold alkali atoms are not yet cold enough to simulate the most interesting and poorly understood low-temperature properties of those models. In this talk, I will emphasize how the rich internal structure of alkaline earth atoms, ions, and molecules can be leveraged to simulate complex many-body physics in presently accessible experimental settings. I will begin by examining how alkaline earth atoms can be used to simulate the physics of so-called heavy fermion materials, and will show how the exotic groundstate properties of those materials manifests in non-equilibrium dynamics at relatively warm temperatures. Not surprisingly, the rich structure of alkaline earth atoms and molecules comes with a price, in many cases increasing the susceptibility of these systems to decoherence. A particularly troubling feature common to alkaline earth atoms and many molecules is the possibility of two-body loss. However, I will show that such loss can be harnessed to drive optically excited alkaline earth atoms and reactive molecules into highly-entangled non-equilibrium steady states, which could be used in the near future to improve the accuracy of high precision atomic clocks operated with alkaline earth atoms. The fate of interacting quantum systems in the presence of decoherence is of interest much more broadly, and I will conclude by describing how trapped ion systems provide a natural platform for addressing this issue. In particular, I will describe an exact solution of the dissipative Ising models that govern trapped ion systems, which affords both a qualitative and quantitative understanding of the effects of decoherence on these large-scale quantum simulators. [Preview Abstract] |
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