Bulletin of the American Physical Society
48th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 62, Number 8
Monday–Friday, June 5–9, 2017; Sacramento, California
Session C2: AMO Thesis Prize SessionInvited
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Chair: Cass Sackett, University of Virginia Room: 306-307 |
Tuesday, June 6, 2017 2:00PM - 2:30PM |
C2.00001: A programmable five qubit quantum computer using trapped atomic ions Invited Speaker: Shantanu Debnath In order to harness the power of quantum information processing, several candidate systems have been investigated, and tailored to demonstrate only specific computations. In my thesis work, we construct a general-purpose multi-qubit device using a linear chain of trapped ion qubits, which in principle can be programmed to run any quantum algorithm. To achieve such flexibility, we develop a pulse shaping technique to realize a set of fully connected two-qubit rotations that entangle arbitrary pairs of qubits using multiple motional modes of the chain. Following a computation architecture, such highly expressive two-qubit gates along with arbitrary single-qubit rotations can be used to compile modular universal logic gates that are effected by targeted optical fields and hence can be reconfigured according to any algorithm circuit programmed in the software. As a demonstration, we run the Deutsch-Jozsa and Bernstein-Vazirani algorithm, and a fully coherent quantum Fourier transform, that we use to solve the `period finding' and `quantum phase estimation' problem. Combining these results with recent demonstrations of quantum fault-tolerance, Grover's search algorithm, and simulation of boson hopping establishes the versatility of such a computation module that can potentially be connected to other modules for future large-scale computations. [Preview Abstract] |
Tuesday, June 6, 2017 2:30PM - 3:00PM |
C2.00002: Control of molecular rotation with an optical centrifuge Invited Speaker: Aleksey Korobenko The main purpose of this work is the experimental study of the applicability of an optical centrifuge -- a novel tool, utilizing non-resonant broadband laser radiation to excite molecular rotation -- to produce and control molecules in extremely high rotational states, so called molecular ``super rotors'', and to study their optical, magnetic, acoustic, hydrodynamic and quantum mechanical properties. [Preview Abstract] |
Tuesday, June 6, 2017 3:00PM - 3:30PM |
C2.00003: High precision optical spectroscopy and quantum state selected photodissociation of ultracold $^{88}$Sr$_2$ molecules in an optical lattice Invited Speaker: Mickey McDonald Over the past several decades, rapid progress has been made toward the accurate characterization and control of atoms, epitomized by the ever-increasing accuracy and precision of optical atomic lattice clocks. Extending this progress to molecules will have exciting implications for chemistry, condensed matter physics, and precision tests of physics beyond the Standard Model. My thesis describes work performed over the past six years to establish the state of the art in manipulation and quantum control of ultracold molecules. We describe a thorough set of measurements characterizing the rovibrational structure of weakly bound $^{88}$Sr$_2$ molecules from several different perspectives, including determinations of binding energies; linear, quadratic, and higher order Zeeman shifts; transition strengths between bound states; and lifetimes of narrow subradiant states. Finally, we discuss measurements of photofragment angular distributions produced by photodissociation of molecules in single quantum states, leading to an exploration of quantum-state-resolved ultracold chemistry. The images of exploding photofragments produced in these studies exhibit dramatic interference effects and strongly violate semiclassical predictions, instead requiring a fully quantum mechanical description. [Preview Abstract] |
Tuesday, June 6, 2017 3:30PM - 4:00PM |
C2.00004: Quantum measurement with atomic cavity optomechanics Invited Speaker: Sydney Schreppler A cloud of ultracold atoms trapped within the confines of a high-finesse optical cavity shakes from the pressure of the light that probes it. This radiation pressure is a form of quantum backaction, a disruptive consequence of quantum measurement that imposes fundamental limits on measurement precision. The existence of these limits has long been an underlying tenet of quantum mechanical theory, though experimental validation has only been recent. In this talk, I will describe experiments enlisting the collective motion of ultracold atoms as the mechanical degree of freedom in a cavity optomechanical system to reach settings cold and quiet enough to allow the effects of measurement backaction to manifest. Recounting observations of quantum-limited force measurement, ponderomotive squeezing, and a new understanding of complex quantum correlations, I focus on experiments that emphasize the nature of measurement backaction: how it can be detected, tuned, and perhaps, through careful accounting, avoided. [Preview Abstract] |
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