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Search Publications by: David J. Wineland (Assoc)

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Displaying 126 - 150 of 242

Quantum information processing with trapped ions,

January 1, 2003
Author(s)
David J. Wineland, Murray D. Barrett, Joseph W. Britton, J Chiaverini, B. L. DeMarco, Wayne M. Itano, Branislav M. Jelenkovic, Christopher Langer, Dietrich G. Leibfried, Till P. Rosenband, T Schaetz
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 qubits. A geometric phase gate between two ion qubits is

Sympathetic cooling of 9 Be + and 24 Mg + for quantum logic

January 1, 2003
Author(s)
Murray D. Barrett, B. L. DeMarco, T Schaetz, Dietrich Leibfried, Joseph W. Britton, J Chiaverini, Wayne M. Itano, Branislav M. Jelenkovic, John D. Jost, Christopher Langer, Till P. Rosenband, David J. Wineland
We demonstrate the cooling of a two species ion crystal consisting of one 9Be+ and one 24Mg+ ion. Since the respective cooling transitions of these two species are separated by more than 30 nm, laser manipulation of one ion has negligible effect on the

Towards quantum information with trapped ions at NIST

January 1, 2003
Author(s)
Dietrich G. Leibfried, B. L. DeMarco, V Meyer, M A. Rowe, A Ben-kish, Murray D. Barrett, Joseph W. Britton, J Hughes, Wayne M. Itano, Branislav M. Jelenkovic, Christopher Langer, D Lucas, Till P. Rosenband, David J. Wineland
We report experiments on coherent quantum-state synthesis and the control of trapped atomic ions. This work has the overall goal of performing large-scale quantum information processing; however, such techniques can also be applied to fundamental tests and

Transport of Quantum States and Separation of Ions in a Dual RF Ion Trap

September 1, 2002
Author(s)
Mary A. Rowe, A. Ben-Kish, B. DeMarco, D. Leibfried, V. Meyer, James A. Beall, J. Britton, J. Hughes, Wayne M. Itano, Branislav M. Jelenkovic, C. Langer, T. Rosenband, David J. Wineland
We have investigated ion dynamics associated with a dual linear ion trap where ions can be stored in and moved betweenn two distinct locations. Such a trap is a building block for a system to engineer arbitrary quantum states of ion ensembles. Specifically

Architecture for a Large-Scale Ion-Trap Quantum Computer

January 1, 2002
Author(s)
D Kielpinski, C R. Monroe, David J. Wineland
Among the numerous types of architecture being explored for quantum computers are systems utilizing ion traps, in which quantum bits (qubits) are formed from the electronic states of trapped ions and coupled through the Coulomb interaction. Although the

Coherence of Quantum Superpositions Through Coupling to Engineered Reservoirs

January 1, 2002
Author(s)
C J. Myatt, B E. King, Q A. Turchette, C A. Sackett, D Kielpinski, Wayne M. Itano, C Monroe, David J. Wineland
The theory of quantum mechanics applies to closed systems. In such ideal situations, a single atom can, for example, exist simultaneously in a superposition of two different spatial locations. In contrast, real systems always interact with their

Optical Frequency Standards and Measurements

January 1, 2002
Author(s)
Leo W. Hollberg, Christopher W. Oates, E A. Curtis, Eugene N. Ivanov, Scott A. Diddams, T Udem, Hugh Robinson, James C. Bergquist, Wayne M. Itano, Robert E. Drullinger, David J. Wineland

Sub-dekahertz spectroscopy of 199 Hg +

September 21, 2001
Author(s)
J. C. Bergquist, R J. Rafac, B. A. Young, James A. Beall, Wayne M. Itano, David J. Wineland
Using a laser that is frequency locked to a Fabry-Perot etalon of high finesse and stability, we probe the 5d 106s 2S = (F=0, m f=0) 5d 96s 2 2 d5/2 (F=2, m f=0) electric-quadrupole transition of a single laser-cooled 199Hg + ion stored in a cryogenic

A Mercury-Ion Optical Clock

September 9, 2001
Author(s)
James C. Bergquist, U Tanaka, Robert E. Drullinger, Wayne M. Itano, David J. Wineland, Scott A. Diddams, Leo W. Hollberg, E A. Curtis, Christopher W. Oates, T Udem

Time Measurement at the Millennium

March 1, 2001
Author(s)
James C. Bergquist, Steven R. Jefferts, David J. Wineland
The latest clocks use a single ion to measure time with an anticipated precision of on part in 10 18

A Single 199 Hg + Ion Optical Clock

January 1, 2001
Author(s)
James C. Bergquist, Christopher W. Oates, E A. Curtis, Leo W. Hollberg, Robert E. Drullinger, Wayne M. Itano, David J. Wineland, T Udem

Decoherence-Free Quantum Memory Using Trapped Ions

January 1, 2001
Author(s)
D Kielpinski, V Meyer, M A. Rowe, C A. Sackett, Wayne M. Itano, C Monroe, David J. Wineland
We demonstrate a decoherence-free quantum memory of one qubit. By encoding the qubit into the decoherence-free subspace (DFS) of a pair of trapped 9Be+ ions, we protect the qubit from environment-induced dephasing that limits the storage time of a qubit

Experimental Violation of Bell's Inequalities with Efficient Detection

January 1, 2001
Author(s)
M A. Rowe, D Kielpinski, V Meyer, C A. Sackett, Wayne M. Itano, C Monroe, David J. Wineland
Local realism is the idea that objects have definite properties whether or not they are measured, and that measurements of these properties are not affected by events taking place sufficiently far away. Einstein, Podolsky and Rosen used these reasonable

Primary Atomic Frequency Standards at NIST

January 1, 2001
Author(s)
Donald Sullivan, James C. Bergquist, Robert E. Drullinger, Wayne M. Itano, Steven R. Jefferts, D W. Lee, D Meekhof, Thomas E. Parker, F L. Walls, David J. Wineland

Recent Results in Trapped-Ion Quantum Computing at NIST,

January 1, 2001
Author(s)
D Kielpinski, A Ben-kish, Joseph W. Britton, V Meyer, M A. Rowe, C A. Sackett, Wayne M. Itano, C Monroe, David J. Wineland
We review recent experiments on entanglement, Bell's inequality, and decoherence-free subspaces in a quantum register of trapped 9Be+ ions.

Decoherence of Quantum Superpositions Through Coupling to Engineering Reservoirs

January 1, 2000
Author(s)
C J. Myatt, B E. King, Q A. Turchette, C A. Sackett, D Kielpinski, Wayne M. Itano, W M. Monroe, David J. Wineland
The theory of quantum mechanics applies to closed systems. In such ideal situations, a single atom can, for example, exist simultaneously in a superposition of two different spatial locations. In contrast, real systems always interact with their