Photoassociation spectroscopy of a Spin-1 Bose-Einstein condensate (2008)
Hamley, C. D., Bookjans, E. M., Behin-Aein, G., Ahmadi, P., Chapman, M. S.
We report on the high resolution photoassociation spectroscopy of a $^{87}$Rb spin-1 Bose-Einstein condensate to the $1_\mathrm{g} (P_{3/2}) v = 152$ excited molecular states. We demonstrate the use...
Electron Density Representation and Real-Space Refinement (New tricks from an old dog) (2008)
E. Blanc, G. Zhou, Z. Chen, Q. Xie, J. Wang, J. Wang, ...
The expected electron density for an atomic model is calculated directly from the coordinates in a resolutiondependent manner. Several applications are discussed. Firstly, it is possible to refine...
Photoionization and Photoelectric Loading of Barium Ion Traps (2007)
Steele, A. V., Churchill, L. R., Griffin, P. F., Chapman, M. S.
Simple and effective techniques for loading barium ions into linear Paul traps are demonstrated. Two-step photoionization of neutral barium is achieved using a weak intercombination line (6s2 1S0 ...
Dipolar effect in coherent spin mixing of two atoms in a single optical lattice site (2006)
Sun, B., Zhang, W. X., Yi, S., Chapman, M. S., You, L.
We show that atomic dipolar effects are detectable in the system that recently demonstrated two-atom coherent spin dynamics within individual lattice sites of a Mott state. Based on a two-state...
Controlled splitting of an atomic wave packet (2006)
Zhang, M., Zhang, P., Chapman, M. S., You, L.
We propose a simple scheme capable of adiabatically splitting an atomic wave packet using two independent translating traps. Implemented with optical dipole traps, our scheme allows a high degree of...
Quantum telecommunication based on atomic cascade transitions (2006)
Chaneliere, T., Matsukevich, D. N., Jenkins, S. D., Kennedy, T. A. B., Chapman, M. S., Kuzmich, A.
A quantum repeater at telecommunications wavelengths with long-lived atomic memory is proposed, and its critical elements are experimentally demonstrated using a cold atomic ensemble. Via atomic...
Dynamical instability and domain formation in a spin-1 Bose condensate (2005)
Zhang, Wenxian, Zhou, D. L., Chapman, M. S., You, L.
We interpret the recently observed spatial domain formation in spin-1 atomic condensates as a result of dynamical instability. Within the mean field theory, a homogeneous condensate is dynamically...
Coherent spin mixing dynamics in a spin-1 atomic condensate (2005)
Zhang, Wenxian, Zhou, D. L., Chapman, M. S., You, L.
We study the coherent off-equilibrium spin mixing inside an atomic condensate. Using mean field theory and adopting the single spatial mode approximation (SMA), the condensate spin dynamics is found...
Observation of spinor dynamics in optically trapped 87Rb Bose-Einstein Condensates (2003)
Hamley, C. D., Barrett, M. D., Sauer, J. A., Fortier, K. M., Zhang, W., ...
We measure spin mixing of F=1 and F=2 spinor condensates of 87Rb atoms confined in an optical trap. We determine the spin mixing time to be typically less than 600 ms and observe spin population...
Cavity QED with optically transported atoms (2003)
Sauer, J. A., Fortier, K. M., Chang, M. S., Hamley, C. D., Chapman, M. S.
Ultracold $^{87}$Rb atoms are delivered into a high-finesse optical micro-cavity using a translating optical lattice trap and detected via the cavity field. The atoms are loaded into an optical...
Atom-photon entanglement generation and distribution (2003)
Sun, B., Chapman, M. S., You, L.
We extend an earlier model by Law {\it et al.} \cite{law} for a cavity QED based single-photon-gun to atom-photon entanglement generation and distribution. We illuminate the importance of a small...
A Storage Ring for Neutral Atoms (2001)
Sauer, J. A., Barrett, M. D., Chapman, M. S.
We have demonstrated a storage ring for ultra-cold neutral atoms. Atoms with mean velocities of 1 m/s corresponding to kinetic energies of ~100 neV are confined to a 2 cm diameter ring by magnetic...
All Optical Formation of an Atomic Bose-Einstein Condensate (2001)
Barrett, M. D., Sauer, J. A., Chapman, M. S.
We have created a Bose-Einstein condensate of 87Rb atoms directly in an optical trap. We employ a quasi-electrostatic dipole force trap formed by two crossed CO_2 laser beams. Loading directly from a...
Quantum entanglement using trapped atomic spins (2000)
We propose an implementation for quantum logic and computing using trapped atomic spins of two different species, interacting via direct magnetic spin-spin interaction. In this scheme, the spins...
Quantum Logic with Trapped Atoms in Optical Cavity QED (1998)
Chapman, M. S., You, L., Kennedy, T. A.
The principle goal of our program is the demonstration of scalable quantum logic between qubits encoded in the internal states of neutral atoms sharing the quantum field of an optical cavity. This...
Real-Time Cavity QED with Single Atoms (1998)
Hood, C. J., Chapman, M. S., Lynn, T. W., Kimble, H. J.
The combination of cold atoms and large coherent coupling enables investigations in a new regime in cavity QED with single-atom trajectories monitored in real time with high signal-to-noise ratio....
Real-time detection of individual atoms falling through a high-finesse optical cavity (1996)
Mabuchi, H., Turchette, Q. A., Chapman, M. S., Kimble, H. J.
The enhanced coupling between atoms and photons inside a high-finesse optical cavity provides a novel basis for optical measurements that continuously monitor atomic degrees of freedom. We describe...
G. Zhou, G. Parthasarathy, T. Somasundaram, A. Ables, L. Roy, S. J. Strong, ...
Expression, purification from inclusion bodies, and crystal characterization of a transition state analog complex of arginine kinase: A model for studying phosphagen kinases
Real-Time Detection of Individual Atoms Falling Through a High-Finesse Optical Cavity (1996)
Mabuchi Turchette Chapman, H. Mabuchi, Q. A. Turchette, M. S. Chapman, H. J. Kimble
single intracavity atom dominates the cavity field decay rate k, the atomic dipole decay rate g' , and the inverse atomic transit time T 21 . Current efforts focus on extending these initial...
Exclusive Electron Scattering from Deuterium at High Momentum Transfer (1995)
Bulten, H. J., Anthony, P. L., Arnold, R. G., Arrington, J., Beise, E. J., Belz, E., ...
Cross sections are presented for the reaction 2H(e,e′p)n for momentum transfers in the range 1.2≤Q^2≤6.8 (GeV/c)^2 and for missing momenta from 0 to 250 MeV/c. The longitudinal-transverse...
Inclusive Electron Scattering from Nuclei at $x \simeq 1$ (1995)
Arrington, J., Anthony, P., Arnold, R. G., Beise, E. J., Belz, J. E., Bosted, P. E., ...
The inclusive A(e,e') cross section for $x \simeq 1$ was measured on $^2$H, C, Fe, and Au for momentum transfers $Q^2$ from 1-7 (GeV/c)$^2$. The scaling behavior of the data was examined in the...
Watching one's P's and Q's: promiscuity, plasticity, and quasiequivalence in a T = 1 virus.
Although quasiequivalence is not needed to explain the assembly of the T = 1 canine parvovirus capsid, the interactions of the 60-fold symmetrical capsid protein with less symmetrical viral...
Induced fit in arginine kinase.
Zhou, G, Ellington, W R, Chapman, M S
Creatine kinase (CK) and arginine kinase (AK) are related enzymes that reversibly transfer a phosphoryl group between a guanidino compound and ADP. In the buffering of ATP energy levels, they are...
Conformational disorder of proteins assessed by real-space molecular dynamics refinement.
Motion is critical to the function of many proteins, but much more difficult to study than structure. Due to lack of easy alternatives, although there are inherent limitations, there have been...
Watching one's P's and Q's: promiscuity, plasticity, and quasiequivalence in a T = 1 virus.
Although quasiequivalence is not needed to explain the assembly of the T = 1 canine parvovirus capsid, the interactions of the 60-fold symmetrical capsid protein with less symmetrical viral...
Induced fit in arginine kinase.
Zhou, G, Ellington, W R, Chapman, M S
Creatine kinase (CK) and arginine kinase (AK) are related enzymes that reversibly transfer a phosphoryl group between a guanidino compound and ADP. In the buffering of ATP energy levels, they are...
Conformational disorder of proteins assessed by real-space molecular dynamics refinement.
Motion is critical to the function of many proteins, but much more difficult to study than structure. Due to lack of easy alternatives, although there are inherent limitations, there have been...
Mapping the surface properties of macromolecules.
Methods are presented for the rapid computation of schematic projections of the surfaces of macromolecules, similar to the "roadmaps" used to illustrate the surfaces of viruses (Rossmann, M.G. &...
Zhou, G., Parthasarathy, G., Somasundaram, T., Ables, A., Roy, L., Strong, S. J., ...
Phosphagen kinases catalyze the reversible transfer of a phosphoryl group between guanidino phosphate compounds and ADP, thereby regenerating ATP during bursts of cellular activity. Large quantities...