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Exponential scaling of clock stability with atom number
T. Rosenband, D. R. Leibrandt
In trapped-atom clocks, the primary source of decoherence is often the phase noise of the oscillator. For this case, we derive theoretical performance gains by combining several at…
Numerical test of few-qubit clock protocols
Till Rosenband
The stability of several clock protocols based on 2 to 20 entangled atoms is evaluated numerically by a simulation that includes the effect of decoherence due to classical oscillat…
Trapped-Ion State Detection through Coherent Motion
D. B. Hume, C. W. Chou, D. R. Leibrandt +3
We demonstrate a general method for state detection of trapped ions that can be applied to a large class of atomic and molecular species. We couple a "spectroscopy" ion (Al+) to a…
Quantum coherence between two atoms beyond Q=10^15
C. W. Chou, D. B. Hume, M. J. Thorpe +2
We place two atoms in quantum superposition states and observe coherent phase evolution for 3.4x10^15 cycles. Correlation signals from the two atoms yield information about their r…
Frequency Comparison of Two High-Accuracy Al+ Optical Clocks
C. -W. Chou, D. B. Hume, J. C. J. Koelemeij +2
We have constructed an optical clock with a fractional frequency inaccuracy of 8.6e-18, based on quantum logic spectroscopy of an Al+ ion. A simultaneously trapped Mg+ ion serves t…
Preparation of Dicke States in an Ion Chain
D. B. Hume, C. W. Chou, T. Rosenband +1
We have investigated theoretically and experimentally a method for preparing Dicke states in trapped atomic ions. We consider a linear chain of ion qubits that is prepared in a…
High-fidelity, adaptive qubit measurements through repetitive information transfer
D. B. Hume, T. Rosenband, D. J. Wineland
Using two trapped ion species ( and ) as primary and ancillary systems, we implement qubit measurements based on the repetitive transfer of information…
Quantum control, quantum information processing, and quantum-limited metrology with trapped ions
D. J. Wineland, D. Leibfried, M. D. Barrett +21
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 q…
Long-lived qubit memory using atomic ions
C. Langer, R. Ozeri, J. D. Jost +13
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 obser…
Hyperfine Coherence in the Presence of Spontaneous Photon Scattering
R. Ozeri, C. Langer, J. D. Jost +11
The coherence of a hyperfine-state superposition of a trapped Be ion in the presence of off-resonant light is experimentally studied. It is shown that Rayleigh elastic sc…
Sympathetic cooling of and for quantum logic
M. D. Barrett, B. DeMarco, T. Schaetz +9
We demonstrate the cooling of a two species ion crystal consisting of one and one ion. Since the respective cooling transitions of these two species are separa…
Quantum information processing with trapped ions
D. J. Wineland, M. Barrett, J. Britton +9
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…
Trapped-Ion Quantum Simulator: Experimental Application to Nonlinear Interferometers
D. Leibfried, B. DeMarco, V. Meyer +8
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 potent…
Experimental demonstration of a technique to generate arbitrary quantum superposition states
A. Ben-Kish, B. DeMarco, V. Meyer +8
Using a single, harmonically trapped Be ion, we experimentally demonstrate a technique for generation of arbitrary states of a two-level particle confined by a harmonic pot…
Experimental demonstration of a controlled-NOT wave-packet gate
B. DeMarco, A. Ben-Kish, D. Leibfried +8
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 de…
Transport of Quantum States and Separation of Ions in a Dual RF Ion Trap
M. A. Rowe, A. Ben-Kish, B. DeMarco +10
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…