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Browsing MIT Open Access Articles by Title

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  • Khan, Asif; Vijayaraghavan, Muralidaran; Mithal, Arvind (Institute of Electrical and Electronics Engineers (IEEE), 2012-07)
    Efficient use of FPGA resources requires FPGA-based performance models of complex hardware to implement one model cycle, i.e., one time-step of the original synchronous system, in several implementation cycles. Generally ...
  • Zhang, Hao; Hu, Jiazhong; Schleier-Smith, Monika; McConnell, Robert Puryear; Cuk, Senka; Vuletic, Vladan (American Physical Society, 2013-12)
    We propose and analyze a probabilistic but heralded scheme to generate pure, entangled, non-Gaussian states of collective spin in large atomic ensembles by means of single-photon detection. One photon announces the preparation ...
  • Rudner, M. S.; Vandersypen, L. M. K.; Vuletic, Vladan; Levitov, Leonid (American Physical Society (APS), 2011-11)
    We present a scheme for achieving coherent spin squeezing of nuclear spin states in semiconductor quantum dots. The nuclear polarization dependence of the electron spin resonance generates a unitary evolution that drives ...
  • Soltero, Daniel E.; Schwager, Mac; Rus, Daniela L. (Institute of Electrical and Electronics Engineers (IEEE), 2012-10)
    We present an online algorithm for a robot to shape its path to a locally optimal configuration for collecting information in an unknown dynamic environment. As the robot travels along its path, it identifies both where ...
  • Vidula, Mahesh K.; Du, Y.; Shim, J.; E. Lo; Khademhosseini, Ali (Institute of Electrical and Electronics Engineers (IEEE), 2009-05)
    Concentration gradients have important applications in chemical and biological studies. Here we have achieved rapid generation of spatially and temporally controllable concentration gradients of diffusible molecules (i.e. ...
  • Karouby, Johanna; Hertzberg, Mark Peter (American Physical Society, 2014-03)
    We propose a mechanism by which the inflaton can generate baryogenesis, by taking the inflaton to be a complex scalar field with a weakly broken global symmetry, and present a new version of the Affleck–Dine mechanism. The ...
  • Lewis, Joel Brewster (Electronic Journal of Combinatorics, 2012-01)
    We extend earlier work of the same author to enumerate alternating permutations avoiding the permutation pattern 2143. We use a generating tree approach to construct a recursive bijection between the set A[subscript ...
  • Li, Qing; Hoogeboom-Pot, Kathleen; Nardi, Damiano; Murnane, Margaret M.; Kapteyn, Henry C.; Siemens, Mark E.; Anderson, Erik H.; Hellwig, Olav; Dobisz, Elizabeth; Gurney, Bruce; Yang, Ronggui; Nelson, Keith Adam (American Physical Society, 2012-05)
    In this work, we generate and probe the shortest wavelength surface acoustic waves to date, at 45 nm, by diffracting coherent extreme ultraviolet beams from a suboptical phononic crystal. The short acoustic wavelengths ...
  • Demirbas, Umit; Sennaroglu, Alphan; Kaertner, Franz X.; Fujimoto, James G. (Optical Society of America, 2008-12)
    We describe the generation of enhanced pulse energies using a multipass-cavity (MPC) Cr[superscript3] +:LiCAF laser, pumped by inexpensive, single spatial mode laser diodes. A semiconductor saturable absorber was used for ...
  • Siddiqui, Aleem M.; Kaertner, Franz X.; Cirmi, G.; Brida, D.; Cerullo, G. (Institute of Electrical and Electronics Engineers, 2009-06)
    In this work we report on a two-stage approach for the generation of few-optical-cycle pulses at 800 nm; (i) a FF- pumped near-IR OPA produces pulses at 1.3 mum, which are used to generate a WLC with smooth spectral amplitude ...
  • Minnihan, Ellen Catherine; Ando, Nozomi; Brignole, Edward J.; Olshansky, Lisa; Chittuluru, Johnathan; Asturias, Francisco J.; Drennan, Catherine L.; Nocera, Daniel G.; Stubbe, JoAnne (National Academy of Sciences (U.S.), 2013-02)
    Ribonucleotide reductase (RNR) catalyzes the conversion of nucleoside diphosphates to deoxynucleoside diphosphates (dNDPs). The Escherichia coli class Ia RNR uses a mechanism of radical propagation by which a cysteine in ...
  • Chen, Zhao; Zhou, Xibin; Werley, Christopher Alan; Nelson, Keith Adam (American Institute of Physics, 2011-08)
    We demonstrate generation of high-power, multicycle, and frequency-tunable terahertz pulses with microjoule energies by tilting the intensity front of a quasi-sinusoidal intensity-modulated optical waveform. The spatiotemporally ...
  • Hsu, Wei-Chun; Hsieh, Zhi-Ming; Lai, Ying-Yao; Lai, Chien-Jen; Chen, Wei-Ting; Peng, Lung-Han; Pan, Ci-Ling; Kung, A. H. (Institute of Electrical and Electronics Engineers, 2009-10)
    Up to seven laser harmonics covering more than two octaves in frequency have been generated efficiently in a single PPLT crystal, permitting the synthesis of 1.5 femtosecond pulses in a stable and compact setting.
  • Demirbas, Umit; Hong, Kyung-Han; Fujimoto, James G.; Sennaroglu, Alphan; Kärtner, Franz X. (Institute of Electrical and Electronics Engineers (IEEE), 2010-07)
    We report a low-cost, cavity dumped Cr:LiSAF laser, generating 135-fs pulses at 825 nm, with 105 nJ pulse energies and ∼0.78 MW of peak power at 10 kHz, using only 600 mW of pump power.
  • Aaronson, Scott; Bouland, Adam Michael (American Physical Society, 2014-06)
    In 1994, Reck et al. showed how to realize any unitary transformation on a single photon using a product of beam splitters and phase shifters. Here we show that any single beam splitter that nontrivially mixes two modes ...
  • Menze, Bjoern Holger; Leemput, Koen Van; Honkela, Antti; Konukoglu, Ender; Weber, Marc-Andre; Ayache, Nicholas; Golland, Polina (Springer Berlin / Heidelberg, 2011-06)
    Extensive imaging is routinely used in brain tumor patients to monitor the state of the disease and to evaluate therapeutic options. A large number of multi-modal and multi-temporal image volumes is acquired in standard ...
  • Sabuncu, Mert R.; Yeo, Boon Thye Thomas; Fischl, Bruce; Van Leemput, Koen; Golland, Polina (Institute of Electrical and Electronics Engineers, 2010-09)
    We propose a nonparametric, probabilistic model for the automatic segmentation of medical images, given a training set of images and corresponding label maps. The resulting inference algorithms rely on pairwise registrations ...
  • Colding, Tobias; Minicozzi, William (Princeton University Press, 2012-03)
    It has long been conjectured that starting at a generic smooth closed embedded surface in R[superscript 3], the mean curvature flow remains smooth until it arrives at a singularity in a neighborhood of which the flow looks ...
  • Wu, Jianlan; Silbey, Robert J.; Cao, Jianshu (American Physical Society, 2013-05)
    An asymptotic scaling theory is presented using the conceptual basis of trapping-free subspace (i.e., orthogonal subspace) to establish the generic mechanism of optimal efficiency of excitation energy transfer in ...
  • Schechter, Paul L.; Levinson, Rebecca Sobel (Society of Photo-Optical Instrumentation Engineers (SPIE), 2012-09)
    Q1: Why deploy N wavefront sensors on a three mirror anastigmat (TMA) and not N + 1? Q2: Why measure M Zernike coefficients and not M + 1? Q3: Why control L rigid body degrees of freedom (total) on the secondary and tertiary ...
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