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High-Z Supernova Search Team Shares the 2015 Breakthrough Prize in Fundamental Physics

November 10, 2014
High-Z Supernova Search Team

Professor Christopher Stubbs is a member of the High-Z Supernova Search Team which, together with the the Supernova Cosmology Project, have been awarded the 2015 Breakthrough Prize in Fundamental Physics "for the most unexpected discovery that the expansion of the universe is accelerating, rather than slowing as had been long assumed."

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New Nanoscale Tools for Interrogating Living Cells and Cell Networks

November 8, 2014
Nano-Bio Interfaces

Electrodes and electrode arrays capable of recording electrical signals from neurons come in an increasing number of shapes and sizes, and researchers are continuously adding capabilities. Nature Methods profiled several scientists working on new types of electrodes which are delivering ever more electrophysiological information from both intracellular and extracellular measurements, among them Prof. Hongkun Park's research group and its work on vertical nanowire electrode arrays.

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NMR Sees the Spin of a Single Proton

November 5, 2014
Coherent control of reporter spins

Figure 2(a): Coherent control of reporter spins. Rabi oscillations between spin states with a variable-width pulse (red points) with an exponentially damped fit (blue line). Inset: rf pulse sequence. [From: A. Sushkov, I. Lovchinsky, N. Chisholm, R.L. Walsworth, H. Park, and M.D. Lukin, "Magnetic Resonance Detection of Individual Proton Spins Using Quantum Reporters," Phys. Rev. Lett. 113, 197601 | DOI: http://dx.doi.org/10.1103/PhysRevLett.113.197601. Copyright ©2014 by The American Physical Society]

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2014 Highly-Cited Researchers: Demler, Kim, Lukin, Sachdev, and Yacoby

October 22, 2014

 

Thomson-Reuters Highly Cited Researchers represents some of world’s leading scientific minds. Over three thousand researchers (144 of them in physics) earned the distinction by writing the greatest numbers of reports officially designated by Essential Science Indicators℠ as Highly Cited Papers—ranking among the top 1% most cited for their subject field and year of publication, earning them the mark of exceptional impact.

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Suppressing Qubit Dephasing Using Real-Time Hamiltonian Estimation

October 21, 2014
ΔBz oscillations

ΔBz oscillations.: (a) The pulse sequence used to estimate ΔBz. (b) Using nuclear feedback, ΔBz oscillations decay in a coherence time due to residual slow fluctuations in ΔBz. (c) The Ramsey sequence used to operate the S-T*2 ≈ qubit in the rotating frame. (d) The Ramsey contrast (blue dots) decays in a characteristic time (solid line fit ) similar to the oscillations in b due to the same residual slow fluctuations in ΔBz. (e) The Rabi pulse sequence used to drive the qubit in the rotating frame.

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