Bulletin of the American Physical Society
APS March Meeting 2015
Volume 60, Number 1
Monday–Friday, March 2–6, 2015; San Antonio, Texas
Session W18: Invited Session: Novel Approaches for Quantum Information Processing With Polar Molecules |
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Sponsoring Units: GQI DAMOP Chair: Sabre Kais, Qatar Environment and Energy Research Institute & Purdue University Room: Mission Room 103A |
Thursday, March 5, 2015 2:30PM - 3:06PM |
W18.00001: Quantum state preparation of polar molecular ions: Towards quantum logic and spectroscopy Invited Speaker: Michael Drewsen For more than a decade, the translational degrees of freedom of trapped ensembles of molecular ions have efficiently been cooled to temperatures of a few millikelvin through Coulomb interaction with simultaneously trapped and laser Doppler cooled atomic ions [1]. More recently methods to produce rovibrational cold ensembles of translationally cold molecular ions have as well been demonstrated [2-8]. In my talk, I will present our recent progresses towards generating a single polar molecular ion in its absolute ground state with respect to both its rovibrational motion and its motion in the external trapping potential [6,8-11], as well as discuss future perspectives of applying fully quantum state prepared polar molecular ions for extremely high-resolution spectroscopy and as qubits for quantum information processing. [1] M{\o}lhave, K. and Drewsen, M. Phys. Rev. A 62, 011401 (2000). [2] Staanum, P. F., H{\o}jbjerre, K., Skyt, P.S., Hansen, A. K., and Drewsen, M., Nat. Phys. 6, 271 (2010). [3] Schneider, T., Roth,$^{\mathrm{\thinspace }}$B., Duncker, H., Ernsting, I., and Schiller, S., Nat. Phys. 6, 275 (2010). [4] Tong, X., Winney, A. H., and Willitsch, S., Phys. Rev. Lett. 105, 143001 (2010). [5] Rellergert, W. G., Sullivan,S. T., Schowalter, S. J., Kotochigova, S., Chen, K., and Hudson, E. R., Nature 495, 490 (2013) [6] Hansen A. K. et al., Nature 508, 76 (2014). [7] Lien, C.-Y., Seck, C. S., Lin, Y.-W., Nguyen, J. H. V., Tabor, D. A., and Odom, B.C., Nat. Commun. 5, 4783 (2014) [8] Kristensen S. B. et al.,``Non-destructive high purity probabilistic rotational state preparation of a single molecular ion'' Manuscript in preparation. [9] Poulsen G., Miroshychenko Y., and Drewsen M., Phys. Rev. A (Rapid Comm.) 86, 051402 (2012). [10] Poulsen G., and Drewsen M., arXiv:1210.4309v1. [11] Poulsen G., PhD thesis: ``Sideband Cooling of Atomic and Molecular Ions" Department of Physics and Astronomy, Aarhus University. [Preview Abstract] |
Thursday, March 5, 2015 3:06PM - 3:42PM |
W18.00002: Quantum matter based on ultracold molecules Invited Speaker: Jun Ye Molecules cooled to ultralow temperatures provide fundamental new insights to strongly correlated quantum systems, molecular interactions and chemistry in the quantum regime, and precision measurement. Complete control of molecular interactions by producing a molecular gas at very low entropy and near absolute zero has long been hindered by their complex energy level structure. Recently, a range of scientific tools have been developed to enable the production of molecules in the quantum regime. Here, molecular collisions follow full quantum descriptions. Chemical reaction is controlled via quantum statistics of the molecules, along with dipolar effects. Further, molecules can be confined in reduced spatial dimensions and their interactions precisely manipulated via external electromagnetic fields. For example, by encoding a spin-1/2 system in rotational states, we realize a spin lattice system where many-body spin dynamics are directly controlled by long-range and anisotropic dipolar interactions. These new capabilities promise further explorations of strongly interacting and collective quantum effects in exotic quantum matter. [Preview Abstract] |
Thursday, March 5, 2015 3:42PM - 4:18PM |
W18.00003: Abelian and non-abelian topological phases with dipoles Invited Speaker: Alexey Gorshkov Topological phases of matter offer a pathway towards fault-tolerant topological quantum computers, in which quantum information is encoded in nonlocal (topological) degrees of freedom and is processed robustly by braiding (i.e. moving around one another) topological defects called anyons. In this talk, we will develop schemes for taking advantage of the tremendous degree of control recently achieved in atomic, molecular, and optical systems -- particularly in systems of interacting dipoles -- to realize exotic topological phenomena, such as parafermions, Ising anyons, and Fibonacci anyons, that ultimately allow for universal topologically protected quantum computing. [Preview Abstract] |
Thursday, March 5, 2015 4:18PM - 4:54PM |
W18.00004: Getting trapped molecules into the quantum toolkit Invited Speaker: Brian Odom Obtaining control over the rotational quantum state of trapped molecules is a prerequisite for quantum information processing applications. However, this task has presented a significant challenge because of the large number of initial states typically populated and because of unwanted excitations generally occurring during optical manipulation. Using a single spectrally filtered broadband laser simultaneously addressing many rotational levels, we have optically cooled trapped AlH$+$ molecules from room temperature to 4 Kelvins, corresponding to an increase in ground rotational-vibrational state population from 3{\%} to 95{\%}. We anticipate that the cooling timescale can be reduced from 100 milliseconds to a few microseconds and that the cooling efficiency can also be improved. Our broadband cooling technique should also be applicable to a number of other neutral and charged diatomic species. Trapped AlH$+$, in particular, is a good candidate for future work on ultracold chemistry, coherent control and entanglement of rotational quantum states, non-destructive single-molecule state readout by fluorescence, and searches for time-variations of the electron-proton mass ratio. [Preview Abstract] |
Thursday, March 5, 2015 4:54PM - 5:30PM |
W18.00005: Universal Matchgate Quantum Computing With Cold Polar Molecules Invited Speaker: Felipe Herrera Polar molecules in optical lattices are attractive for quantum simulation and computation due to the ability to implement a variety of spin-lattice models using static, microwave and optical fields to engineer the long-range dipolar interaction between molecular qubits. Quantum simulation of spin models requires global control over the molecular ensemble, while quantum computation requires control of individual molecules with sub-wavelength resolution. In this talk, we describe the implementation of a matchgate quantum processor with an ensemble of polar molecules in an optical lattice. The scheme uses few-body qubit encoding and sequential control of two-body dipolar interactions over small plaquetes on a square lattice to perform universal quantum computing without single-site addressing. Effective spin-spin interactions with matchgate symmetry between open-shell polar molecules (e.g., SrF, OH) are driven by two infrared control pulses in the absence of static electric fields. The resulting matchgates are robust with respect to realistic imperfections in the driving fields and lattice trapping. Applications of the architecture for the simulation of interacting fermions in quantum chemistry are discussed, considering an imperfect lattice filling. [Preview Abstract] |
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