Publications
129 results found
Koo K, Sudbery J, Segal DM, et al., 2004, Doppler cooling of Ca<SUP>+</SUP> ions in a Penning trap -: art. no. 043402, PHYSICAL REVIEW A, Vol: 69, ISSN: 1050-2947
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- Citations: 23
Gill P, Barwood GP, Huang G, et al., 2004, Trapped ion optical frequency standards, Publisher: IOP PUBLISHING LTD, Pages: 63-67, ISSN: 0031-8949
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- Citations: 10
Powell HF, de Echaniz SR, Phillips ES, et al., 2003, Improvement of laser cooling of ions in a Penning trap by use of the axialization technique, 3rd International Conference on Trapped Charged Particles and Fundamental Interactions (TCPFI), Publisher: IOP PUBLISHING LTD, Pages: 961-970, ISSN: 0953-4075
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- Citations: 5
Thompson R, 2003, Back to school, PHYSICS WORLD, Vol: 16, Pages: 60-60, ISSN: 0953-8585
Powell HF, Segal DM, Thompson RC, 2002, Axialization of laser cooled magnesium ions in a Penning trap, PHYSICAL REVIEW LETTERS, Vol: 89, ISSN: 0031-9007
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- Citations: 38
Powell HF, van Eijkelenborg MA, Irvine W, et al., 2002, Quantum jumps in singly ionized magnesium, JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, Vol: 35, Pages: 205-216, ISSN: 0953-4075
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- Citations: 12
Thompson RC, Papadimitriou J, 2000, Simple model for the laser cooling of an ion in a Penning trap, JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, Vol: 33, Pages: 3393-3405, ISSN: 0953-4075
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- Citations: 15
Beige A, Huelga SF, Knight PL, et al., 2000, Coherent manipulation of two dipole-dipole interacting ions, Journal of Modern Optics, Vol: 47, Pages: 401-414, ISSN: 0950-0340
We investigate to what extent two trapped ions can be manipulated coherently when their coupling is mediated by adipole-dipole interaction. We will show how the resulting level shift induced by this interaction can be used to create entanglement, while the decay of the states remains nearly negligible. This will allow us to implement conditional dynamics (a CNOT gate) and single qubit operations. We propose two different experimental realizations where a large level shift can be achieved and discuss both the strengths and weaknesses of this scheme from the point of view of a practical realization. © 2000 Taylor & Francis Ltd.
Beige A, Huelga SF, Knight PL, et al., 2000, Coherent manipulation of two dipole—dipole interacting ions, Journal of Modern Optics, Vol: 47-2, Pages: 401-414, ISSN: 0950-0340
We investigate to what extent two trapped ions can be manipulated coherently when their coupling is mediated by a dipole—dipole interaction. We will show how the resulting level shift induced by this interaction can be used to create entanglement, while the decay of the states remains nearly negligible. This will allow us to implement conditional dynamics (a CNOT gate) and single qubit operations. We propose two different experimental realizations where a large level shift can be achieved and discuss both the strengths and weaknesses of this scheme from the point of view of a practical realization. © 2000 Taylor & Francis Group, LLC.
Powell H, Irvine W, van Eijkelenborg MA, et al., 2000, Studies of quantum jumps in a single <sup>25</sup>Mg<sup>+</sup> ion held in a Penning trap
A study of quantum jumps in single magnesium ions held in a Penning trap was presented. Single 24Mg+ ions were experimentally studied in a Penning trap, which a number of interesting effects that occurs only in 25Mg+ are predicted and observed. Results show that the novel features in the behaviour of 25Mg+ are due to the presence of hyperfine structure in this ion.
van Eijkelenborg MA, Storkey MEM, Segal DM, et al., 1999, Sympathetic cooling and detection of molecular ions in a Penning trap, PHYSICAL REVIEW A, Vol: 60, Pages: 3903-3910, ISSN: 1050-2947
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- Citations: 38
van Eijkelenborg MA, Storkey MEM, Segal DM, et al., 1999, Ion dynamics in a novel linear combined trap, INTERNATIONAL JOURNAL OF MASS SPECTROMETRY, Vol: 188, Pages: 155-161, ISSN: 1387-3806
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- Citations: 10
Horvath GZK, Thompson RC, 1999, Laser cooling of ions stored in a Penning trap: A phase-space picture, PHYSICAL REVIEW A, Vol: 59, Pages: 4530-4546, ISSN: 1050-2947
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- Citations: 4
Beige A, Huelga SF, Knight PL, et al., 1999, Coherent manipulation of two-dipole-dipole interacting ions, JOURNAL OF MODERN OPTICS, Vol: 47, Pages: 401-414, ISSN: 0950-0340
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- Citations: 29
van Eijkelenborg MA, Dholakia K, Storkey MEM, et al., 1999, A driven, trapped, laser cooled ion cloud: a forced damped oscillator, OPTICS COMMUNICATIONS, Vol: 159, Pages: 169-176, ISSN: 0030-4018
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- Citations: 8
Thompson RC, Hernandez-Pozos JL, Hoffges J, et al., 1999, The quantum zeno effect in trapped ions, Trapped Charged Particles and Fundamentals Physics, Vol: 457, Pages: 388-392, ISSN: 0094-243X
Horvath GZK, Hernandez-Pozos JL, Dholakia K, et al., 1998, Ion dynamics in perturbed quadrupole ion traps, PHYSICAL REVIEW A, Vol: 57, Pages: 1944-1956, ISSN: 1050-2947
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- Citations: 20
Thompson RC, Wilson DC, 1997, The motion of small numbers of ions in a Penning trap, ZEITSCHRIFT FUR PHYSIK D-ATOMS MOLECULES AND CLUSTERS, Vol: 42, Pages: 271-277, ISSN: 0178-7683
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- Citations: 13
Horvath GZK, Thompson RC, Knight PL, 1997, Fundamental physics with trapped ions, CONTEMPORARY PHYSICS, Vol: 38, Pages: 25-48, ISSN: 0010-7514
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- Citations: 41
Thompson RC, Dholakia K, HernandezPozos JL, et al., 1997, Spectroscopy and quantum optics with ion traps, 28th Annual Conference of the European-Group-for-Atomic-Spectroscopy, Publisher: ROYAL SWEDISH ACAD SCIENCES, Pages: 24-33, ISSN: 0281-1847
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- Citations: 3
Power WL, Thompson RC, 1996, Laguerre-Gaussian laser beams and ion traps, OPTICS COMMUNICATIONS, Vol: 132, Pages: 371-378, ISSN: 0030-4018
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- Citations: 3
Plenio MB, Knight PL, Thompson RC, 1996, Inhibition of spontaneous decay by continuous measurements. Proposal for realizable experiment, OPTICS COMMUNICATIONS, Vol: 123, Pages: 278-286, ISSN: 0030-4018
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- Citations: 48
Horvath GZK, Dholakia K, Hernandez-Pozos JL, et al., 1996, Theoretical calculation and experimental measurement of an `avoided crossing' in the combined ion trap
Calculation of the oscillation frequencies of ions confined in a trap, which combines the static and magnetic fields of a Penning trap with the oscillating electric field of a radiofrequency trap, takes into account a possible misalignment of the magnetic field direction with respect to trap symmetry axis. The resulting ion oscillation frequencies are similar to those of a perfect trap, except that there is an `avoided crossing' near the point where the axial and upper radial frequency would degenerate without misalignment. The measured frequencies and the variation of the gap magnitude with angle is in agreement with the theoretical model and can form the basis for aligning a combined or Penning trap accurately with external magnetic field.
Feng X, Hernandez-Pozos JL, Vincent J, et al., 1996, Quantum effects in trapped beryllium ions
Two experiments looking at the different aspects of the quantum theory of the interaction of radiation with atoms (ions) are reported. The first experiment investigates the quantum Zeno effect in which an atomic transition is `slowed down' by repeated measurements of the state of the system. The second experiment takes advantage of the unique properties of trapped ions to study cavity quantum electrodynamics (QED) effects, in particular, the modifications to the spontaneous emission of trapped ions held at the center of an optical cavity. The magnitude of the cavity's effect on the atomic emission increases with decreasing cavity mode volume so that small cavities and hence small traps are needed.
DHOLAKIA K, HORVATH GZK, POWER W, et al., 1995, INVESTIGATION OF ION DYNAMICS IN A PENNING TRAP USING A PULSE-PROBE TECHNIQUE, APPLIED PHYSICS B-LASERS AND OPTICS, Vol: 60, Pages: 375-382, ISSN: 0946-2171
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- Citations: 3
Rink J, Dholakia K, Horvath GZK, et al., 1995, A study of trapped ion dynamics by photon-correlation and pulse-probe techniques, Non-Neutral Plasma Physics Ii, Pages: 162-170, ISSN: 0094-243X
Horvath GZK, Thompson RC, 1994, Simulations of laser cooling in a penning trap, Pages: 3-4
Available information is often limited from ion trapping experiments about the effectiveness of the laser cooling and the exact state of motion of the trapped ions. For this reason, we have performed extensive simulations of the motion of ions experiencing laser cooling in a Penning trap. We are then able to use the results of the simulations both to interpret the experimental results we obtain and also to guide future experiments.
THOMPSON RC, DHOLAKIA K, HORVATH GZK, et al., 1994, SPECTROSCOPY OF LASER-COOLED IONS, 11th National Quantum Electronics Conference, Publisher: TAYLOR & FRANCIS LTD, Pages: 1087-1098, ISSN: 0950-0340
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- Citations: 1
Thompson RC, Dholakia K, Horvath GZK, et al., 1994, Spectroscopy of laser-cooled ions, Journal of Modern Optics, Vol: 41, Pages: 1087-1098, ISSN: 0950-0340
GISIN N, KNIGHT PL, PERCIVAL IC, et al., 1993, QUANTUM STATE DIFFUSION-THEORY AND A QUANTUM JUMP EXPERIMENT, JOURNAL OF MODERN OPTICS, Vol: 40, Pages: 1663-1671, ISSN: 0950-0340
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- Citations: 50
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