Bulletin of the American Physical Society
42nd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 56, Number 5
Monday–Friday, June 13–17, 2011; Atlanta, Georgia
Session C3: Single-atom Optical Interfacing |
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Chair: Peter Maunz, Duke University Room: A703 |
Tuesday, June 14, 2011 2:00PM - 2:12PM |
C3.00001: Ion-photon networks for scalable quantum computing Susan Clark, David Hayes, David Hucul, Shantanu Debnath, Qudsia Quraishi, Steven Olmschenk, Dzmitry Matsukevich, Peter Maunz, Christopher Monroe Trapped ions connected by photons are a promising avenue for large-scale quantum computing and quantum information transfer. Previous experiments with photonically connected, distant, trapped ions establish ion entanglement and teleportation. Here, we report advances toward combining these photonic gates between distant ions with Coulombic gates between nearby ions in order to demonstrate a scalable quantum network. Specifically, we show individual optical addressing of single ions, allowing for photonic entanglement to be performed separately from Coulombic gates. Additionally, we move from a four rod trap to a segmented blade-type trap to more easily hold a larger number of ions. Finally, we implement a more robust method of ion entanglement that lessens dephasing due to rf trap noise. These improvements are important steps to the realization of a scalable ion-photon network. This work was supported by grants from the U.S. Army Research Office with funding from IARPA, the DARPA OLE program, and the MURI program; the NSF PIF Program; the NSF Physics Frontier Center at JQI; the European Commission AQUTE program. [Preview Abstract] |
Tuesday, June 14, 2011 2:12PM - 2:24PM |
C3.00002: A collective ion-photon interface L. Karpa, M. Cetina, A. Bylinskii, D. Gangloff, K. Beck, Y. Ge, A. Grier, I. Chuang, V. Vuleti\'c We present a novel ion-photon interface implemented by combining a linear array of microfabricated radio-frequency ion traps with a medium-finesse ($\cong$ 4000) optical resonator. We demonstrate deterministic loading of up to 10 array sites from an elongated ion crystal as well as their collective coupling to the optical cavity mode. Preliminary results show the capability of the system to store photonic information while providing single ion addressability. We anticipate applications in quantum information science, where photonically mediated information is mapped onto ion states that can subsequently be processed by manipulating the internal states or the collective motional modes of the trapped ions. [Preview Abstract] |
Tuesday, June 14, 2011 2:24PM - 2:36PM |
C3.00003: Fluorescence spectrum of a strongly driven single trapped ion in a cavity Le Luo, Andrew Manning, Jonathan Sterk, Chris Monroe, Peter Maunz A single trapped ytterbium ion inside a 2 mm optical cavity has been used to study the emission spectrum of a strongly driven atom-cavity system in the intermediate coupling regime. By driving the atom from the side of the cavity with a coherent laser field, the fluorescence emitted into an undriven cavity mode is observed. The cavity emission spectra are produced by scanning the cavity length for various driving strengths and laser-atom detunings. We observe the emergence of a three-peak feature of the spectrum at higher driving strengths that differs significantly from the normal single peak under weak excitation. We find that a simple convolution of the free-space Mollow triplet with the cavity transfer function does not sufficiently describe the observed spectrum, necessitating a more complete treatment by solving a strongly driven Jaynes-Cummings model with dissipation. [Preview Abstract] |
Tuesday, June 14, 2011 2:36PM - 2:48PM |
C3.00004: ``Tack'' ion trap for efficient photon collection Gang Shu, Chen-Kuan Chou, Nathan Kurz, Thomas Noel, John Wright, Boris Blinov Efficient photon collection is essential for state detection and entanglement generation in trapped ion quantum computation. Compared with other popular approaches such as refractive optics and optical cavity, reflective optics provides simple solutions with broad optical band but no adverse effect to trapping. Here we present the design and operation of a novel ion trap that incorporates a high numerical aperture metallic spherical mirror as its RF trapping electrode, which enables up to 35{\%} solid angle collection of trapped ion fluorescence. Its movable central needle-shaped electrode allows precise placement of the ion along the optical axis. We show a possible scheme to compensate the spherical mirror's large aberration. Owing to its simple design, the trap structure can be easily adapted for micro-fabrication and integrated into more complex ion trap architectures. [Preview Abstract] |
Tuesday, June 14, 2011 2:48PM - 3:00PM |
C3.00005: Wavelength scale imaging of trapped ions for quantum networking Erik Streed, Benjamin Norton, Andreas Jechow, Matt Petrasiunas, David Kielpinski We have demonstrated wavelength scale imaging of Ytterbium ions with a microfabricated phase Fresnel lens. Near diffraction limited ion spot sizes of 440 nm (FWHM) were observed by fluorescence imaging on the 369.5 nm transition. The phase Fresnel lens was integrated in-vacuum with a needle style radio frequency Paul trap. To reduce the ion motion below the imaging resolution the ions were laser cooled close to the Doppler limit on the 369.5 nm transition This is the first demonstration of imaging trapped ions with a resolution on the order of the transition wavelength, an important step towards obtaining high efficiency mode-matching of the ion fluorescence emission to a single optical mode. [Preview Abstract] |
Tuesday, June 14, 2011 3:00PM - 3:12PM |
C3.00006: Entangling two single atoms at remote locations J. Hofmann, N. Ortegel, M. Krug, F. Henkel, M. Weber, W. Rosenfeld, H. Weinfurter Entanglement between distant atomic quantum memories is a key resource for future applications in quantum communication, like quantum networks and the quantum repeater. We have set up two independently operating atomic traps situated in two neighboring laboratories separated by 20 meter. On each side we capture a single neutral Rb-87 atom in an optical dipole trap and generate a spin-entangled state between the atom and single spontaneously emitted photon [1]. The photons are collected with high-NA objectives into single-mode optical fibers and guided to the same 50:50 fiber beam-splitter (BS) where they interfere. A coincident detection of two orthogonally polarized photons allows us to project the atoms onto two out of four maximally entangled Bell-states. This Bell-state projection swaps the entanglement onto the atoms. In order to determine the performance of the Bell-state projection we measure polarization dependent cross-correlations of photon-pairs leaving the BS. We observe a two-photon visibility of $90.8\%$. This result marks an important step towards the successful entanglement of two atoms at large distances, ready for a new test of Bell's inequality [2].\\[0pt] [1] J. Volz, et al., Phys. Rev. Lett. 96, 030404 (2006).\\[0pt] [2] W. Rosenfeld, et al., Adv. Sci. Lett. 2, 469 (2009). [Preview Abstract] |
Tuesday, June 14, 2011 3:12PM - 3:24PM |
C3.00007: Pulse Shaping Entangling Gates and Error Supression D. Hucul, D. Hayes, S.M. Clark, S. Debnath, Q. Quraishi, C. Monroe Control of spin dependent forces is important for generating entanglement and realizing quantum simulations in trapped ion systems. Here we propose and implement a composite pulse sequence based on the Molmer-Sorenson gate to decrease gate infidelity due to frequency and timing errors. The composite pulse sequence uses an optical frequency comb to drive Raman transitions simultaneously detuned from trapped ion transverse motional red and blue sideband frequencies. The spin dependent force displaces the ions in phase space, and the resulting spin-dependent geometric phase depends on the detuning. Voltage noise on the rf electrodes changes the detuning between the trapped ions' motional frequency and the laser, decreasing the fidelity of the gate. The composite pulse sequence consists of successive pulse trains from counter- propagating frequency combs with phase control of the microwave beatnote of the lasers to passively suppress detuning errors. We present the theory and experimental data with one and two ions where a gate is performed with a composite pulse sequence. This work supported by the U.S. ARO, IARPA, the DARPA OLE program, the MURI program; the NSF PIF Program; the NSF Physics Frontier Center at JQI; the European Commission AQUTE program; and the IC postdoc program administered by the NGA. [Preview Abstract] |
Tuesday, June 14, 2011 3:24PM - 3:36PM |
C3.00008: Monolithic symmetric ion trap for quantum simulation Fayaz Shaikh, Richart Slusher We describe the novel design of a monolithic two-level ion trap that combines the flexibility and scalability of VLSI silicon microfabrication with the superior trapping characteristics of multi-level traps. Electrostatic simulations demonstrate that the trap has a deep trapping potential (1 eV for Yb+ ion) and radially symmetric RF confinement field. The trap has an angled through-chip slot which allows backside ion loading and through laser access while avoiding surface light scattering and dielectric charging. The geometrical trap features and dimensions are optimized for investigating ion chains with equal ion spacing. Control potentials have been derived to produce linear equally-spaced ion chains of up to 50 ions that can be used to perform simulations of quantum magnets. The potentials are optimized to give ion separations of 5 to 10 microns, micromotion compensation, and constant motional mode axes and frequencies along the chain. The trap is in fabrication at Georgia Tech using techniques similar to those developed for the planar ion traps. [Preview Abstract] |
Tuesday, June 14, 2011 3:36PM - 3:48PM |
C3.00009: MEMS-based beam steering system for individual addressing of trapped ions Taehyun Kim, Caleb Knoernschild, Emily Mount, Stephen Crain, Rachel Noek, Daniel Gaultney, Andre van Rynbach, Peter Maunz, Jungsang Kim One of the important components to implement large-scale trapped ion quantum information processing is a scalable technology to manipulate individual ions in a long linear chain of ions. So far, individual addressing has been demonstrated by steering a focused laser beam on individual ions with acousto-optic and electro- optic deflectors, by utilizing the Zeeman shift due to a magnetic field gradient, and by separating a single ion from the rest of the chain for individual exposure to laser light. Micro-mirrors based on microelectromechanical system (MEMS) technology can be used to design an alternative beam steering system which can handle multiple beams with different wavelengths and address locations in multiple dimensions. We will report our progress in integrating a MEMS beam steering system with an Yb ion trap experiment. Our MEMS system is designed to steer an ultraviolet beam with a waist of $\sim$1.5$\mu$m across a 20$\mu$m range. To demonstrate the individual addressing capability, we plan to measure the Ramsey interference of the differential AC Stark shift induced by an individually-focused, far-detuned laser beam. [Preview Abstract] |
Tuesday, June 14, 2011 3:48PM - 4:00PM |
C3.00010: Addressing single atoms in a 3D optical lattice Xiao Li, Ted Corcovilos, Yang Wang, Jungsang Kim, David S. Weiss We will describe an experiment to address single Cs atoms tightly trapped in a 3D optical lattice with 5 micron spacing. Two intersecting perpendicular, 2.7 micron waist, 880-nm lasers beams impose an ac-Stark shift on the energy levels of a single target atom that is about twice as large as the shift imposed on any other atom. This allows us to drive microwave transitions that are only resonant for the target atom. The positions of the addressing beams are controlled dynamically by two electrostatically-actuated MEMS mirrors, which allow any atom within a 5$\times $5$\times $5 array to be targeted within tens of microseconds. Such single site addressing will allow for controlled arbitrary filling of the lattice and will constitute the single qubit gate operation for quantum computing. [Preview Abstract] |
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