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 J2: Coherent Control with Optical Frequency Combs |
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Chair: Linda Young, Argonne National Laboratory Room: Imperial Center |
Thursday, May 27, 2010 8:00AM - 8:30AM |
J2.00001: Coherent frequency combs and spectroscopy Invited Speaker: Optical frequency combs possessing precise phase coherence across the entire visible spectrum have profoundly changed optical frequency metrology and ultrafast science, with breakthrough developments in optical atomic clocks, optical frequency synthesis, direct frequency comb spectroscopy (DFCS), high-resolution quantum control, coherent pulse synthesis and amplification, and control of sub-femtosecond electron dynamics in atoms and molecules. DFCS [1] is a new spectroscopic approach that embraces simultaneously broad spectral coverage, fine spectral resolution, numerous detection channels, ultrahigh sensitivity, and real-time analysis [2]. These powerful capabilities have been demonstrated in a series of experiments where identification and quantification of many different molecular states or species are achieved in a massively parallel fashion [3]. A range of interesting scientific applications will be discussed. \\[4pt] [1] A. Marian et al., Science 306, 2063 (2004). \\[0pt] [2] M. J. Thorpe et al., Science 311, 1595 (2006). \\[0pt] [3] M. J. Thorpe {\&} J. Ye, Appl. Phys. B 91, 397 (2008). [Preview Abstract] |
Thursday, May 27, 2010 8:30AM - 9:00AM |
J2.00002: Optical separation and purification of enantiomers using coherent pulse sequences Invited Speaker: We discuss the theory of phase-sensitive stimulated symmetry breaking as applied to the separation and purification of (``racemic'') mixtures of chiral molecules into their right-handed and left-handed constituents (``enantiomers''). In particular, we discuss a new scheme by which one can use laser beams to spatially separate mixtures of trapped ultracold chiral molecules to the individual enantiomers, thereby emulating optically for gas phase molecules the chiral-crystals separation achieved by Pasteur using a pair of tweezers. We also discuss applications of the above to understanding the so-called ``Hund Paradox,'' namely that crystals of chiral molecules are always built from the symmetry-broken forms and never from the equal-energy symmetric or anti-symmetric forms. [Preview Abstract] |
Thursday, May 27, 2010 9:00AM - 9:30AM |
J2.00003: Quantum Information Processing with Atomic Qubits and Optical Frequency Combs Invited Speaker: Pulsed optical fields from mode-locked lasers have found widespread use as tools for precision quantum control and are well suited for implementation in quantum information processing and quantum simulation. We experimentally demonstrate two distinct regimes of the interaction between hyperfine atomic ion qubits and stimulated Raman transitions driven by picosecond pulses from a far off- resonant mode-locked laser. In the weak pulse regime, the coherent accumulation of successive pulses from an optical frequency comb performs single qubit operations and is used to entangle two trapped atomic ion qubits. In the strong pulse regime, a single pulse is used to implement a fast ($<$10 ps) Hadamard gate and we show how a few pulses may be used to address the atom's motion by imparting state-dependent momentum kicks. To entangle multiple ions, optical frequency combs operated near the strong pulse regime may be used to implement motion-mediated gates that can be performed much faster than a collective motional period.\\[4pt] [1] Garc\'{i}a-Ripoll \textit{et al.}, PRL \textbf{91}, 157901 (2003).\\[0pt] [2] Duan, PRL \textbf{93}, 100502 (2004). [Preview Abstract] |
Thursday, May 27, 2010 9:30AM - 10:00AM |
J2.00004: Adiabatic Control of Two-Photon Transitions via Optical Frequency Comb Invited Speaker: An optical frequency comb is recognized as a new and unique tool for high-resolution spectroscopic analysis as well as for controlling ultrafast phenomena in atomic and molecular physics. The investigations have been carried out implementing a femtosecond frequency comb to manipulate ultracold gases. These include a theory on piecewise stimulated Raman adiabatic passage using two coherent pulse trains with pulse-to-pulse amplitude and chirped phase variation to create ultracold KRb molecules from Feshbach states, [1,2]. Here, we demonstrate how to use a single, phase modulated optical frequency comb to control population dynamics aiming at creation of deeply bound ultracold polar molecules, [3]. We model the KRb cooling by the three-level $\lambda$-system interacting with a single femtosecond optical frequency comb, that governs the Raman transitions from the Feshbach state to the ground electronic vibrational state. The phase across a single pulse in the pulse train is sinusoidally modulated with a carefully chosen amplitude and modulation frequency. Partial adiabatic population transfer is fulfilled to the final state by each pulse in the applied pulse train providing a controlled population accumulation in the final state. Detuning the carrier frequency and the modulation frequency to less than the frequency difference between the initial and final states changes the time scale of molecular dynamics but leads to the same complete population transfer. Strong dependence of the cooling dynamics is observed on the magnitude of the amplitude of sinusoidal modulation. The proposed scheme demonstrates the robustness of a single optical frequency comb in application to molecular cooling from Feshbach states. \\[4pt] [1] A. Pe'er, E.A. Shapiro, M.C. Stowe, M. Shapiro, J. Ye, ``Precise control of molecular dynamics with a femtosecond frequency comb'', Phys. Rev. Lett., 98, 113004(4) (2007). \\[0pt] [2] E.A. Shapiro, A. Pe'er, J. Ye, M. Shapiro, ``Piecewise Adiabatic Population transfer in a molecule via a Wave Packet'', Phys. Rev. Lett., 101, 023601 (2008). \\[0pt] [3] W. Shi, S. Malinovskaya, ``Implementation of a single femtosecond optical frequency comb for molecular cooling'', submitted. [Preview Abstract] |
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