Charles A. Sackett

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Q. A. Turchette,† D. Kielpinski, B. E. King, D. Leibfried, D. M. Meekhof, C. J. Myatt, M. A. Rowe, C. A. Sackett, C. S. Wood, W. M. Itano, C. Monroe, and D. J. Wineland Time and Frequency Division, National Institute of Standards and Technology, Boulder, CO 80303 (February 22, 2000) We have investigated motional heating of laser-cooled 9Be+ ions held in(More)
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 composed of a single ion. We measured the storage time under ambient conditions and under interaction(More)
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 assumptions to conclude that quantum mechanics is incomplete. Starting in 1965, Bell and others(More)
We present results from an experimental study of the decoherence and decay of quantum states of a trapped atomic ion’s harmonic motion interacting with several types of engineered reservoirs. We experimentally simulate three types of reservoirs: a high-temperature amplitude reservoir, a zero-temperature amplitude reservoir, and a high-temperature phase(More)
We experimentally investigate three methods, utilizing different atomic observables and entangled states, to increase the sensitivity of rotation angle measurements beyond the "standard quantum limit" for nonentangled states. All methods use a form of quantum mechanical "squeezing." In a system of two entangled trapped (9)Be(+) ions we observe a reduction(More)
C. A. Sackett,1 H. T. C. Stoof,1,2 and R. G. Hulet1 1Physics Department and Rice Quantum Institute, Rice University, Houston, Texas 77251-1892 2Institute for Theoretical Physics, University of Utrecht, Princetonplein 5, 3584 CC Utrecht, The Netherlands (Received 23 October 1997) We consider the dynamics of a quantum degenerate trapped gas of 7Li atoms.(More)
With recent developments in the general eld of quantum information, it has become clear that quantum systems have the potential to yield signi cant advances in information technology [1{4]. Because of this potential, considerable experimental e ort is underway to develop physical systems which are suitable for quantum information applications, in forms(More)
We have investigated the temperature stability of the dichroic atomic vapor laser lock laser frequency lock method. We find that, in general, the lock exhibits significant temperature sensitivity, leading to laser frequency drifts as large as tens of MHz/K. However, for certain configurations of the optical elements of the system, this temperature(More)
Atoms from a (87)Rb condensate are suspended against gravity using repeated reflections from a pulsed optical standing wave. Up to 100 reflections are observed, yielding suspension times of over 100 ms. The local gravitational acceleration can be determined from the pulse rate required to achieve suspension. Further, a gravitationally sensitive atom(More)