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 P2: Focus Session: Quantum Information Processing with Ions |
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Chair: Phil Richerme, University of Maryland Room: 200B |
Thursday, June 6, 2013 2:00PM - 2:30PM |
P2.00001: Integrated Microsystems Approach to Trapped Ion Quantum Information Processing Invited Speaker: Jungsang Kim Trapped atomic ions are the leading candidate physical system for quantum information processing, featuring high quality qubits capable of high fidelity operations including state preparation, detection and quantum logic gates. A major remaining challenge is the task of constructing experimental systems where all operations necessary for quantum information processing can be performed in a scalable way. I will discuss a three-tier approach to construct such scalable hardware utilizing technologies that are available today. Arbitrary qubit gate operations in a linear ion chain ($< 10^2$ ions) can be realized with control beams that can address individual ions in the chain. Shuttling of ions between such chains enable qubit gates between several chains ($\sim 10$ chains) implemented in a single chip trap. One can then connect a large number ($\sim 10^3$) of such trap chips using reconfigurable photonic network. Complex microfabricated ion trap chips integrated with various optical components such as reflectors, lenses and optical cavities are crucial in realizing efficient interfaces for these experiments, and micromirrors can provide fast and flexible beam delivery system with individual addressing capability. I will present the progress in ion qubit manipulation on microfabricated chip traps, the integration effort with optical components, and potential application in scalable quantum computer and quantum repeater realization. [Preview Abstract] |
Thursday, June 6, 2013 2:30PM - 2:42PM |
P2.00002: Ultrafast entanglement of trapped ions Brian Neyenhuis, Jonathan Mizrahi, Kale Johnson, Christopher Monroe We have demonstrated ultrafast spin-motion entanglement of a single atomic ion using a short train of intense laser pulses. This pulse train gives the ion a spin-dependent kick where each spin state receives a discrete momentum kick in opposite directions. Using a series of these spin-dependent kicks we can realize a two qubit gate [1,2]. In contrast to gates using spectroscopically resolved motional sidebands, these gates may be performed faster than the trap oscillation period, making them potentially less sensitive to noise, independent of temperature, and more easily scalable to large crystals of ions. We show that multiple kicks can be strung together to create a ``Schrodinger cat'' like state, where the large separation between the two parts of the wavepacket allow us to accumulate the phase shift necessary for a gate in a shorter amount of time. We will present a realistic pulse scheme for a two ion gate, and our progress towards its realization.\\[4pt] [1] J. J. Garc\'i a-Ripoll, P. Zoller, and J. I. Cirac, Phys. Rev. Lett. 91, 157901 (2003).\\[0pt] [2] L.-M. Duan, Phys. Rev. Lett. 93, 100502 (2004). [Preview Abstract] |
Thursday, June 6, 2013 2:42PM - 2:54PM |
P2.00003: Heralded entanglement of two ions in an optical cavity Tracy E. Northup, Bernardo Casabone, Andreas Stute, Birgit Brandst\"{a}tter, Konstantin Friebe, Klemens Sch\"{u}ppert, Rainer Blatt Optical cavities constitute a coherent interface between light and matter, while strings of addressable ions enable local quantum information processing. Coupling multiple, individually addressable ions to the mode of an optical cavity not only provides a framework for quantum network protocols but also can enhance the strength of the ion-cavity interface. Here, we demonstrate precise control of the coupling of each of two ions to the mode of an optical resonator. We then show ion-ion entanglement heralded by the detection of two orthogonally polarized cavity photons. Applications of this scheme to improve the effective ion-cavity coupling strength are discussed. [Preview Abstract] |
Thursday, June 6, 2013 2:54PM - 3:24PM |
P2.00004: Measuring single molecular ion spectra by Coulomb crystal heating Invited Speaker: Kenneth Brown Quantum information processing with ions uses the normal modes of motion of a Coulomb crystal to perform gates by transferring information between ions. The information transfer can also be used to perform spectroscopy. The experiment uses two ions: a control ion for laser cooling and readout and a target ion for spectroscopy. The interaction of light with the target ion excites the motion of the two ion Coulomb crystal. This motion can then be observed by a change in control ion fluorescence. For atomic ions various methods of excitation and readout have been demonstrated ranging from quantum logic spectroscopy to sympathetic heating spectroscopy. In this talk, I will present our progress towards using a molecular ion as the target ion. Specifically, I will discuss our experiments looking at vibrational overtones in CaH$^+$ and rovibronic transitions in BH$^+$. The vibrational transitions of metal hydrides are candidates for observing temporal changes in the ratio of the proton mass to the electron mass and BH$^+$ is a candidate for direct laser cooling of molecular ions. [Preview Abstract] |
Thursday, June 6, 2013 3:24PM - 3:36PM |
P2.00005: Measurement, entanglement, and collapse, in atom-photon scattering Roee Ozeri, Yinnon Glickman, Shlomi Kotler, Nitzan Akerman Photon scattering is a common tool in atomic physics experiments. We show how, entanglement, measurement and decoherence are intertwined in the process of photon scattering by a single trapped ion. We preform quantum process tomography on the spin of a single trapped $^{88}$Sr$^{+}$ ion, undergoing resonant photon scattering [1]. We observe that, following the scattering and detection of a single photon, a spin measurement basis emerges. The measurement basis is aligned with the scattered photon direction and its state are invariant under photon scattering. We also find that, while the measurement basis states themselves are classically correlated with the scattered photon polarization, superpositions of these basis state become entangled with the scattered photon. Quantum feedback, based on photon polarization measurement, can be used to reverse photon scattering decoherence [2]. \\[4pt] [1] Y. Glickman, S. Kotler, N. Akerman, and R. Ozeri. ``Emergence of a measurement basis in atom-photon scattering.'' arXiv e-prints, (2012). Science In Press.\\[0pt] [2] N. Akerman, S. Kotler, Y. Glickman, and R. Ozeri. ``Reversal of photon-scattering errors in atomic qubits" Phys. Rev. Lett., 109:103601, (2012). [Preview Abstract] |
Thursday, June 6, 2013 3:36PM - 3:48PM |
P2.00006: Eigenstate spectroscopy with cold ion quantum simulation James Freericks, Bryce Yoshimura, Wes Campbell As the number of ions employed in quantum simulations grows, the minimal excitation gaps shrink, as does the decoherence time, making it more and more difficult to run a simulation that will adiabatically prepare a nontrivial ground state. This is especially true for systems that are frustrated and have a large number of low lying eigenstates. But this creates a new opportunity for simulation, as it allows one to populate the excited states due to diabatic effects and then perform spectroscopy on them to determine the energy levels of the low-lying excited states. In this talk, we describe the ideas behind excited state spectroscopy and we show examples drawn from the transverse-field Ising model, where one can perform an analysis for large systems when the interactions do not decay with distance, or for smaller systems when one takes into account realistic parameters from experiments. We discuss the role of symmetry and how to optimize the spectroscopy measurements by performing conventional simulations of this model. The parameters we optimize with respect to include the time dependence of the transverse field, and the expectation value that is employed for the spectroscopy measurement. We discuss the prospects for experiments to use these techniques in the near future. [Preview Abstract] |
Thursday, June 6, 2013 3:48PM - 4:00PM |
P2.00007: State-independent experimental test of quantum contextuality with a single trapped ion Xiang Zhang, Mark Um, Junhua Zhang, Shuoming An, Ye Wang, Kihwan Kim, Dong-ling Deng, Chao Shen, Lu-Ming Duan We experimentally demonstrate state-independent quantum contextuality in a three-level system (qutrit) with a single trapped ion [1] by observing the violation of the Kochen-Specker (KS) inequality proposed in Ref. [2]. Our results are clearly conflicted with the predictions of non-contextual classical theories, where a measurement outcome is predetermined and is unaffected by other measurements of compatible observables. Qutrit is the most fundamental system that reveals quantum contextuality, which is not based on entanglement or particular quantum states but rooted in the structure of quantum mechanics. We realize the qutrit system by using three levels in the hyperfine ground states of ${^{171}\mathrm{Yb}^+}$ ion. The qutrit system is manipulated by microwaves with near-perfect fidelity and is measured without the detection loophole by a standard two-step quantum jump technique. [1] Zhang Xiang, et al., accepted in Phys. Rev. Lett. [2] S. Yu and C. H. Oh, Phys. Rev. Lett. 108, 030402 (2012). This work was supported by the National Basic Research Program of China Grant 2011CBA00300, 2011CBA00301, 2011CBA00302, the National Natural Science Foundation of China Grant 61073174, 61033001, 61061130540. KK acknowledges the support from the Thousand Young Talents plan. [Preview Abstract] |
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