Quantifying the Power of Multiple Event Interpretations

July 31, 2014

A number of methods have been proposed recently which exploit multiple highly-correlated interpretations of events, or of jets within an event. For example, Qjets reclusters a jet multiple times and telescoping jets uses multiple cone sizes. Previous work has employed these methods in pseudo-experimental analyses and found that, with a simplified statistical treatment, they give sizable improvements over traditional methods.


All-Optical Electrophysiology in Mammalian Neurons Using Engineered Microbial Rhodopsins

July 15, 2014

Optopatch enables high-fidelity optical stimulation and recording in cultured neurons: Parallel optical recording under increasingly strong 0.5-s optical step stimuli. Asterisk indicates a cell that showed periodic bursts of three or four APs under weak stimulation. Scale bar, 500 μm. Image is of EGFP fluorescence. [Figure reprinted by permission from Macmillan Publishers Ltd: see D.R. Hochbaum, Y. Zhao, S.L. Farhi, N. Klapoetke...


Patterns Formed by Shadows of Spheres

July 6, 2014
Patterns Formed by Shadows of Spheres

Phase diagrams obtained via black CM2 1⁄4 0 and yellow CM3 1⁄4 0 curves for shadow overlap with nearest and next-nearest neighbors. Top left panel: Close-packed square lattice phase diagram (2r=a 1⁄4 2r=b 1⁄4 1, γ 1⁄4 π=2) reflects the fourfold lattice symmetry. Bottom left panel: Dense hexagonal lattice phase diagram (2r=a 1⁄4 2r=b 1⁄4 0.95, γ 1⁄4 π=3) with sixfold symmetry. [From S.V. Kostinski, E.R. Chen, and M.P. Brenner, "Characterization of Patterns Formed by Shadows of Spheres," Phys. Rev.


Jerison, Chowdhury, Saklayen Win Fellowships

June 26, 2014
fellowships winners

Congratulations to Harvard Physics graduate students Elizabeth Jerison and Debanjan Chowdhury who won the Harvard Merit Scholarship and Nabiha Saklayen who was awarded an International Student Research Fellowship by the Howard Hughes Medical Institute.

The Harvard Merit/Term Time Research Awards are available to outstanding GSAS students in all fields. These fellowships are normally to be held in the fourth or fifth year, or earlier, and are for the purpose of allowing the students to devote a greater portion of their time to research, fieldwork, and writing than would otherwise be possible if they have a heavy teaching load or other employment.


A Quantum Network of Clocks

June 16, 2014
World-wide quantum clock network

The concept of world-wide quantum clock network: Illustration of a cooperative clock operation protocol in which individual parties (for example, satellite-based atomic clocks from different countries) jointly allocate their respective resources in a global network involving entangled quantum states. This guarantees an optimal use of the global resources, achieving an ultra-precise clock signal limited only by the fundamental bounds of quantum metrology and, in addition, guaranteeing secure distribution of the clock signal. b. [Figure reprinted by permission from Macmillan Publishers Ltd: P. Kómár, E. M. Kessler, M. Bishof, L.


Two Steps Forward, One Step Back

June 12, 2014

The rich get richer: Gain (purple points) and loss (yellow points) as a function of pre-test score. The more prior knowledge students have, the more concepts they gain during their course of study and the fewer they lose. [Figure reprinted by permission from Macmillan Publishers Ltd: N. Lasry, J. Guillemette, E. Mazur, "Two steps forward, one step back," Nature Physics 10, 402–403(2014) | doi:10.1038/nphys2988 ©2014.]