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Nat Phys, Vol. 4, No. 6. (June 2008), pp. 463-466.
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Nature In Nature, Vol. 429, No. 6993. (17 June 2004), pp. 737-739.
by M. D. Barrett, J. Chiaverini, T. Schaetz, et al.J. Britton, W. M. Itano, J. D. Jost, E. Knill, C. Langer, D. Leibfried, R. Ozeri, D. J. Wineland
Abstract
Quantum teleportation1 provides a means to transport quantum information efficiently from one location to another, without the physical transfer of the associated quantum-information carrier. This is achieved by using the non-local correlations of previously distributed, entangled quantum bits (qubits). Teleportation is expected to play an integral role in quantum communication2 and quantum computation3. Previous experimental demonstrations have been implemented with optical systems that used both discrete and continuous variables4, 5, 6, 7, 8, 9, and with liquid-state nuclear magnetic resonance10. Here ...
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Nature In Nature, Vol. 429, No. 6993. (17 June 2004), pp. 734-737.
by M. Riebe, H. Haffner, C. F. Roos, et al.W. Hansel, J. Benhelm, G. P. T. Lancaster, T. W. Korber, C. Becher, F. Schmidt-Kaler, D. F. V. James, R. Blatt
Abstract
Teleportation of a quantum state encompasses the complete transfer of information from one particle to another. The complete specification of the quantum state of a system generally requires an infinite amount of information, even for simple two-level systems (qubits). Moreover, the principles of quantum mechanics dictate that any measurement on a system immediately alters its state, while yielding at most one bit of information. The transfer of a state from one system to another (by performing measurements on the first and ...
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Nature, Vol. 421, No. 6918. (2 January 2003), pp. 48-50.
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Science, Vol. 308, No. 5724. (13 May 2005), pp. 997-1000.
by J. Chiaverini, J. Britton, D. Leibfried, et al.E. Knill, M. D. Barrett, R. B. Blakestad, W. M. Itano, J. D. Jost, C. Langer, R. Ozeri, T. Schaetz, D. J. Wineland
Abstract
We report the implementation of the semiclassical quantum Fourier transform in a system of three beryllium ion qubits (two-level quantum systems) confined in a segmented multizone trap. The quantum Fourier transform is the crucial final step in Shor's algorithm, and it acts on a register of qubits to determine the periodicity of the quantum state's amplitudes. Because only probability amplitudes are required for this task, a more efficient semiclassical version can be used, for which only single-qubit operations conditioned on measurement ...
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Physical Review Letters, Vol. 89, No. 10. (Aug 2002), 103001.
Abstract
The quadrupole S 1/2 – D 5/2 optical transition of a single trapped Ca + ion; well suited for encoding a quantum bit of information; is coherently coupled to the standing wave field of a high finesse cavity. The coupling is verified by observing the ion’s response to both spatial and temporal variations of the intracavity field. We also achieve deterministic coupling of the cavity mode to the ion’s vibrational state by selectively exciting vibrational state-changing transitions and ...
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Nature, Vol. 453, No. 7198. (18 June 2008), pp. 1023-1030.
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Nature, Vol. 438, No. 7068. (01 December 2005), pp. 643-646.
by H. Haffner, W. Hansel, C. F. Roos, et al.J. Benhelm, D. Chek-al-kar, M. Chwalla, T. Korber, U. D. Rapol, M. Riebe, P. O. Schmidt, C. Becher, O. Guhne, W. Dur, R. Blatt
Abstract
The generation, manipulation and fundamental understanding of entanglement lies at the very heart of quantum mechanics. Entangled particles are non-interacting but are described by a common wavefunction; consequently, individual particles are not independent of each other and their quantum properties are inextricably interwoven1, 2, 3. The intriguing features of entanglement become particularly evident if the particles can be individually controlled and physically separated. However, both the experimental realization and characterization of entanglement become exceedingly difficult for systems with many particles. The ...
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Nature, Vol. 438, No. 7068. (1 December 2005), pp. 639-642.
by D. Leibfried, E. Knill, S. Seidelin, et al.J. Britton, R. B. Blakestad, J. Chiaverini, D. B. Hume, W. M. Itano, J. D. Jost, C. Langer, R. Ozeri, R. Reichle, D. J. Wineland
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Nature, Vol. 422, No. 6930. (27 March 2003), pp. 412-415.
by D. Leibfried, B. Demarco, V. Meyer, et al.D. Lucas, M. Barrett, J. Britton, W. M. Itano, B. Jelenkovic, C. Langer, T. Rosenband, D. J. Wineland
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Nature, Vol. 422, No. 6930. (27 March 2003), pp. 408-411.
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Reviews of Modern Physics, Vol. 74, No. 1. (Mar 2002), pp. 145-195.
Abstract
Quantum cryptography could well be the first application of quantum mechanics at the single-quantum level. The rapid progress in both theory and experiment in recent years is reviewed; with emphasis on open questions and technological issues. ...
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Physical Review Letters, Vol. 78, No. 16. (21 Apr 1997), pp. 3221-3224.
Abstract
We propose a scheme to utilize photons for ideal quantum transmission between atoms located at spatially separated nodes of a quantum network. The transmission protocol employs special laser pulses that excite an atom inside an optical cavity at the sending node so that its state is mapped into a time-symmetric photon wave packet that will enter a cavity at the receiving node and be absorbed by an atom there with unit probability . Implementation of our ...
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Nature, Vol. 414, No. 6862. (22 November 2001), pp. 413-418.
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Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 36, No. 3. (2003), pp. 623-636.
Abstract
Two-level ionic systems, where quantum information is encoded in long-lived states (quantum bits, qubits), are discussed extensively for quantum information processing. We present a collection of measurements which characterize the stability of a qubit based on the S$_1/2$ \– D$_5/2$ transition of single $^40$ Ca $^+$ ions in a linear Paul trap. We find coherence times of ≃ 1 ms, discuss the main technical limitations and outline possible improvements. ...
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