Bulletin of the American Physical Society
41st Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 55, Number 5
Tuesday–Saturday, May 25–29, 2010; Houston, Texas
Session R3: Focus Session: Hybrid and Condensed Matter Quantum Systems |
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Chair: Luis Orozco, University of Maryland Room: Imperial West |
Friday, May 28, 2010 10:30AM - 11:00AM |
R3.00001: Coupling hybrid quantum systems: from atomic to solid-state qubits Invited Speaker: Controlling and understanding the coupling between different objects lies at the heart of modern quantum mechanics. Limits in our ability to couple and decouple certain objects, such quantum bits in solid-state devices, inevitably translate into fundamental constraints for application of these systems to quantum information science and metrology. However, one can conceive a scenario in which different, disparate objects--hybrid systems--can be used together to overcome these limitations. I will discuss how entangling spins with photons or phonons provides the fundamental building block for any such hybrid system, and enables both quantum communication and quantum computation. Specific examples such as circuit-QED devices coupled to atoms and superconducting quantum bits coupled to spins will be considered. [Preview Abstract] |
Friday, May 28, 2010 11:00AM - 11:30AM |
R3.00002: Coupling Spin Ensembles to Micro Wave Photons Invited Speaker: Presently quantum physics is confined to its separate worlds, separated by deserts of classical physics. For quantum physics to emerge from fundamental research, one of the main challenges is how to pool the advantages of the different quantum systems by linking them to each other and preserving the quantum nature also over the link. One has to be able to quantum interconnect the different domains. Here we will look into how to connect spin ensemble qubits to superconducting micro wave quantum circuits. The very small cavity volume, the strong enhancement of the near field and the long lifetime of the photon in a coplanar waveguide resonator (CPWR) is the crucial link. As an example I will discuss coupling an ensemble of 10$^{6}$ ultra-cold Rb atoms to the near field of a superconducting CPWR [1]. We show that one can achieve strong coupling between a single microwave photon and a collective hyperfine qubit state in the ensemble with g$_{eff}$=2$\pi $ 40 kHz. Even more favourable parameters can be achieved for the coupling collective states in an ensemble of NV centres in diamond. The talk will analyse the physics behind these hybrid ``magnetic'' cavity-QED systems and its prospects of experimental realization. \\[4pt] [1] Verdu \textit{et al} Phys. Rev. Lett. \textbf{103}, 043603 (2009). [Preview Abstract] |
Friday, May 28, 2010 11:30AM - 11:42AM |
R3.00003: Towards wire-mediated coupling of trapped ions Sankaranarayanan Selvarajan, Soenke Moeller, Nikos Daniilidis, Hartmut Haeffner Our experiment aims at the transfer of quantum information between distant trapped ions using a macroscopic metal wire: an oscillating trapped ion induces oscillating image charges in the trap electrodes. If this current is sent to the electrodes of a second trap, it influences the motion of an ion in the second trap. With manageable trap geometries, a transfer rate of 1 ms between the motional states of the ions is possible. This ``wire-mediated'' coupling may be used not only for scaling up the quantum information processing devices, but also as a means to interconnect atomic systems to solid-state systems. Towards these goals, we are characterizing the behavior of our planar trap in terms of stray fields and electric field noise. In addition, we discuss experimental tools that we developed to characterize the trap operation in the presence of a floating wire which at a later stage will couple the two ions. [Preview Abstract] |
Friday, May 28, 2010 11:42AM - 11:54AM |
R3.00004: Effect of magnetic field alignment on the electron spin decoherence in NV diamond L. Pham, D. Le Sage, J. Maze, D. Glenn, P. Stanwix, T. Yeung, L. Yi, Y. Zhao, P. Cappellaro, P. Hemmer, M. Lukin, A. Yacoby, R. Walsworth We present an experimental study of electron spin decoherence in ensembles of Nitrogen-Vacancy (NV) color centers in bulk diamond. By applying an external magnetic field over a range of orientations we investigate the mechanism that leads to spin decoherence. Results are in good agreement with recent theoretical modeling, suggesting that decoherence is determined by coupling to a spin bath dominated by a few nearby 13C nuclear spins. With careful alignment of the static magnetic field with the NV symmetry axis, the effect of these nearby nuclear spins is mitigated. We demonstrate T2 coherence times greater than 600 us for ensembles of NVs in CVD diamond, which may aid applications in precision magnetometry and quantum information. [Preview Abstract] |
Friday, May 28, 2010 11:54AM - 12:06PM |
R3.00005: Single Spins in Diamond -- Novel Probes for Nanoscience Gopalakrishnan Balasubramanian, Julia Tisler, Fedor Jelezko, Joerg Wrachtrup Nitrogen-Vacancy color centers in diamond are gaining popularity because of its exceptional optical and spin properties. The single spin of the defect can be manipulated optically, providing an efficient way to entangle single electron spins and couple nuclear spin qubits in diamond. Long spin coherence time of these single defects finds application as sensitive magnetic field probes. Using engineered diamond we achieve ultrahigh sensitivity, which offers us possibilities to detect single external electron or nuclear spin. Broad emission/excitation spectrum and point like nature of the NV defects are attractive features in using them as FRET fluorophore. Attaching the emitter to the tip of a scanning probe microscope we were able to construct a scanning FRET microscope and image single molecules under ambient conditions. By attaching these single spins sensors to the tip of a scanning probe, we were able to perform sensitive scanning probe magnetometry at nanoscale.[1] Improving this device by using quantum grade diamond and synchronized NMR pulse sequences we would have the ability to perform nanoscale NMR/MRI of a single molecules. The method has far reaching potential in solving structure of biomolecules under ambient conditions. [1] Balasubramanian, G. et al. Nanoscale imaging magnetometry with diamond spins under ambient conditions. Nature 455, 648-651(2008). [Preview Abstract] |
Friday, May 28, 2010 12:06PM - 12:18PM |
R3.00006: Phase gate and readout with an atom/molecule hybrid platform Elena Kuznetsova, Marko Gacesa, Susanne Yelin, Robin Cote We suggest a combined atom/molecule platform for quantum computation, where two atoms of different species (e.g., in an optical lattice site) could be used for qubit encoding, initialization and readout, with one atom carrying the qubit and the other enabling a gate. In particular, we descuss the implementation of a two-qubit phase gate, in which a pair of atoms is transferred into the ground rovibrational state of a polar molecule with a large dipole moment, thus allowing molecules in adjacent sites to interact via their dipole-dipole interaction. We also discuss how the reverse process of coherently transferring a molecule into a pair of atoms could be used as a readout tool. [Preview Abstract] |
Friday, May 28, 2010 12:18PM - 12:30PM |
R3.00007: Recent data on a new method for producing ultracold molecular ions Wade Rellergert, Scott Sullivan, Kuang Chen, Steven Schowalter, Julia Clark, Eric Hudson We present recent data from our experimental effort to produce ultracold, internal ground-state BaCl$^{+}$ ions using a Ca MOT. The method utilizes sympathetic cooling due to the strong collisions between co-trapped molecular ions and laser-cooled neutral atoms. In contrast to other experiments producing cold molecular ions, our method should efficiently cool both the internal and external molecular ion degrees of freedom. Samples of such ultracold molecular ions find applications in ultracold chemistry, precision measurement and quantum computation. [Preview Abstract] |
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