Thermometry with spin-dependent lattices (2009)
We propose a method for measuring the temperature of strongly correlated phases of ultracold atom gases confined in spin-dependent optical lattices. In this technique, a small number of "impurity"...
Disordered insulator in an optical lattice (2009)
Pasienski, M., McKay, D., White, M., DeMarco, B.
Disorder can profoundly affect the transport properties of a wide range of quantum materials. For example, the superfluid transition temperature for helium is strongly modified when it is adsorbed in...
BUILDING BLOCKS FOR A SCALABLE QUANTUM INFORMATION PROCESSOR BASED ON TRAPPED IONS (2009)
D. Leibfried, M. D. Barrett, A. Ben Kish, J. Britton, B. Demarco, W. M. Itano, ...
VJe describe the underlying concept and experimental demonstration of the basic building bloclts of a scalable quantum information processor archikcture using trapped ion-clubits. The trap structure...
Lattice Thermodynamics for Ultra-Cold Atoms (2009)
McKay, D., White, M., DeMarco, B.
We measure the temperature of ultra-cold Rb-87 gases transferred into an optical lattice and compare to non-interacting thermodynamics for a combined lattice--parabolic potential. Absolute...
Strongly interacting bosons in a disordered optical lattice (2008)
White, M., Pasienski, M., McKay, D., Zhou, S., Ceperley, D., DeMarco, B.
Disorder, prevalent in nature, is intimately involved in such spectacular effects as the fractional quantum Hall effect and vortex pinning in type-II superconductors. Understanding the role of...
A high-accuracy algorithm for designing arbitrary holographic atom traps (2007)
We report the realization of a new iterative Fourier-transform algorithm for creating holograms that can diffract light into an arbitrary two-dimensional intensity profile. We show that the predicted...
Phase-slip induced dissipation in an atomic Bose-Hubbard system (2007)
McKay, D., White, M., Pasienski, M., DeMarco, B.
Phase slips play a primary role in dissipation across a wide spectrum of bosonic systems, from determining the critical velocity of superfluid helium to generating resistance in thin superconducting...
Bose-Einstein condensates in RF-dressed adiabatic potentials (2006)
White, M., Gao, H., Pasienski, M., DeMarco, B.
Bose-Einstein condensates of $^{87}$Rb atoms are transferred into radio-frequency (RF) induced adiabatic potentials and the properties of the corresponding dressed states are explored. We report on...
Wineland, D. J., Leibfried, D., Barrett, M. D., Ben-Kish, A., Bergquist, J. C., Blakestad, R. B., ...
We briefly discuss recent experiments on quantum information processing using trapped ions at NIST. A central theme of this work has been to increase our capabilities in terms of quantum computing...
Long-lived qubit memory using atomic ions (2005)
Langer, C., Ozeri, R., Jost, J. D., Chiaverini, J., DeMarco, B., Ben-Kish, A., ...
We demonstrate experimentally a robust quantum memory using a magnetic-field-independent hyperfine transition in 9Be+ atomic ion qubits at a magnetic field B ~= 0.01194 T. We observe that the single...
Structure and stability of Mott-insulator shells of bosons trapped in an optical lattice (2005)
DeMarco, B., Lannert, C., Vishveshwara, S.
We consider the feasibility of creating a phase of neutral bosonic atoms in which multiple Mott-insulating states coexist in a shell structure and propose an experiment to spatially resolve such a...
D. J. Wineland, D. Leibfried, M. D. Barrett, A. Ben-kish, J. C. Bergquist, R. B. Blakestad, ...
We briefly discuss recent experiments on quantum information processing using trapped ions at NIST. A central theme of this work has been to increase our cap* bilities in terms of quantum computing...
Towards a scalable quantum computer/simulator based on trapped ions (2004)
Schätz,Tobias, Leibfried,D., Chiaverini,J., Barrett,M. D., Britton,J., DeMarco,B., ...
Towards a scalable quantum computer/simulator based on trapped ions (2004)
Schätz, Tobias, Leibfried, D., Chiaverini, J., Barrett, M. D., Britton, J., DeMarco, B., ...
Sympathetic cooling of $^9Be^+$ and $^{24}Mg^+$ for quantum logic (2003)
Barrett, M. D., DeMarco, B., Schaetz, T., Leibfried, D., Britton, J., Chiaverini, J., ...
We demonstrate the cooling of a two species ion crystal consisting of one $^9Be^+$ and one $^{24}Mg^+$ ion. Since the respective cooling transitions of these two species are separated by more than 30...
Quantum information processing with trapped ions (2002)
Wineland, D. J., Barrett, M., Britton, J., Chiaverini, J., DeMarco, B., Itano, W. M., ...
Experiments directed towards the development of a quantum computer based on trapped atomic ions are described briefly. We discuss the implementation of single qubit operations and gates between...
Trapped-Ion Quantum Simulator: Experimental Application to Nonlinear Interferometers (2002)
Leibfried, D., DeMarco, B., Meyer, V., Rowe, M., Ben-Kish, A., Britton, J., ...
We show how an experimentally realized set of operations on a single trapped ion is sufficient to simulate a wide class of Hamiltonians of a spin-1/2 particle in an external potential. This system is...
Experimental demonstration of a controlled-NOT wave-packet gate (2002)
DeMarco, B., Ben-Kish, A., Leibfried, D., Meyer, V., Rowe, M., Jelenković, B. M., ...
We report the experimental demonstration of a controlled-NOT (CNOT) quantum logic gate between motional and internal state qubits of a single ion where, as opposed to previously demonstrated gates,...
Experimental demonstration of a technique to generate arbitrary quantum superposition states (2002)
Ben-Kish, A., DeMarco, B., Meyer, V., Rowe, M., Britton, J., Itano, W. M., ...
Using a single, harmonically trapped $^9$Be$^+$ ion, we experimentally demonstrate a technique for generation of arbitrary states of a two-level particle confined by a harmonic potential. Rather than...
Transport of Quantum States and Separation of Ions in a Dual RF Ion Trap (2002)
Rowe, M. A., Ben-Kish, A., DeMarco, B., Leibfried, D., Meyer, V., Beall, J., ...
We have investigated ion dynamics associated with a dual linear ion trap where ions can be stored in and moved between two distinct locations. Such a trap is a building block for a system to engineer...
Spin Excitations in a Fermi Gas of Atoms (2001)
We have experimentally investigated a spin excitation in a quantum degenerate Fermi gas of atoms. In the hydrodynamic regime the damping time of the collective excitation is used to probe the quantum...
Two-species magneto-optical trap with 40K and 87Rb (2001)
Goldwin, J., Papp, S. B., DeMarco, B., Jin, D. S.
We trap and cool a gas composed of 40K and 87Rb, using a two-species magneto-optical trap (MOT). This trap represents the first step towards cooling the Bose-Fermi mixture to quantum degeneracy....
Pauli Blocking of Collisions in a Quantum Degenerate Atomic Fermi Gas (2001)
DeMarco, B., Papp, S. B., Jin, D. S.
We have produced an interacting quantum degenerate Fermi gas of atoms composed of two spin-states of magnetically trapped $^{40}$K. The relative Fermi energies are adjusted by controlling the...
Evaporative Cooling of a Two-Component Degenerate Fermi Gas (1999)
Holland, M. J., DeMarco, B., Jin, D. S.
We derive a quantum theory of evaporative cooling for a degenerate Fermi gas with two constituents and show that the optimum cooling trajectory is influenced significantly by the quantum statistics...
Observation of p-wave Threshold Law Using Evaporatively Cooled Fermionic Atoms (1998)
DeMarco, B., Bohn, J. L., Burke, J. P., Holland, M., Jin, D. S.
We have measured independently both s-wave and p-wave cross-dimensional thermalization rates for ultracold potassium-40 atoms held in a magnetic trap. These measurements reveal that this fermionic...
Exploring a quantum degenerate gas of fermionic atoms (1998)
We predict novel phenomena in the behavior of an ultra- cold, trapped gas of fermionic atoms. We find that quantum statistics radically changes the collisional properties, spatial profile, and...