2025
- Symmetry-Protected Topological Haldane Phase on a Qudit Quantum Processor
C.L. Edmunds, E. Rico, I. Arrazola, G.K. Brennen, M. Meth, R. Blatt, M. Ringbauer
PRX Quantum 6, 020349, (2025), arXiv:2408.04702 [quant-ph] - Controlling the spontaneous emission of trapped ions
Tommaso Faorlin, Benjamin Yadin, Yannick Weiser, Gabriel Araneda, Stefan Nimmrichter, Lorenz Panzl, Thomas Lafenthaler, Rainer Blatt, Thomas Monz, Giovanni Cerchiari
New Journal of Physics 27, 064107, (2025), arXiv:2501.08627 [quant-ph] - Simulating two-dimensional lattice gauge theories on a qudit quantum computer
Michael Meth, Jinglei Zhang, Jan F. Haase, Claire Edmunds, Lukas Postler, Andrew J. Jena, Alex Steiner, Luca Dellantonio, Rainer Blatt, Peter Zoller, Thomas Monz, Philipp Schindler, Christine Muschik, Martin Ringbauer
Nature Physics 21, 570–576, (2025), arXiv:2310.12110 [quant-ph]
2009
- Realization of Universal Ion-Trap Quantum Computation with Decoherence-Free Qubits
T. Monz, K. Kim, A. S. Villar, P. Schindler, M. Chwalla, M. Riebe, C. F. Roos, H. Häffner, W. Hänsel, M. Hennrich, R. Blatt
Physical Review Letters 103, 200503, (2009), arXiv:0909.3715 [quant-ph] - Deterministic reordering of 40Ca+ ions in a linear segmented Paul trap
F Splatt, M Harlander, M Brownnutt, F Zähringer, R Blatt, W Hänsel
New Journal of Physics 11, 103008, (2009), arXiv:0906.5335 [quant-ph] - Deterministic single-photon source from a single ion
H G Barros, A Stute, T E Northup, C Russo, P O Schmidt, R Blatt
New Journal of Physics 11, 103004, (2009), arXiv:0905.2885 [quant-ph] - Wiring up trapped ions to study aspects of quantum information
N Daniilidis, T Lee, R Clark, S Narayanan, H Häffner
Journal of Physics B: Atomic, Molecular and Optical Physics 42, 154012, (2009), arXiv:0903.3834 [quant-ph] - State-independent experimental test of quantum contextuality
G. Kirchmair, F. Zähringer, R. Gerritsma, M. Kleinmann, O. Gühne, A. Cabello, R. Blatt, C. F. Roos
Nature 460, 494–497, (2009), arXiv:0904.1655 [quant-ph], Nature News & Views, synopsis of the work - Raman spectroscopy of a single ion coupled to a high-finesse cavity
C. Russo, H. G. Barros, A. Stute, F. Dubin, E. S. Phillips, T. Monz, T. E. Northup, C. Becher, T. Salzburger, H. Ritsch, P. O. Schmidt, R. Blatt
Applied Physics B 95, 205–212, (2009), arXiv:0810.2792 [quant-ph] - Intensity-Field Correlation of Single-Atom Resonance Fluorescence
S. Gerber, D. Rotter, L. Slodička, J. Eschner, H. J. Carmichael, R. Blatt
Physical Review Letters 102, 183601, (2009), arXiv:0901.3979 [quant-ph] - Deterministic entanglement of ions in thermal states of motion
G Kirchmair, J Benhelm, F Zähringer, R Gerritsma, C F Roos, R Blatt
New Journal of Physics 11, 023002, (2009), arXiv:0810.0670 [quant-ph] - High-fidelity entanglement of hyperfine clock states
G. Kirchmair, J. Benhelm, F. Zähringer, R. Gerritsma, C. F. Roos, R. Blatt
Physical Review A 79, 020304, (2009), arXiv:0812.1976 [quant-ph] - Theory of Cross Phase Modulation for the Vibrational Modes of Trapped Ions
X. Rebecca Nie, Christian F. Roos, Daniel F. V. James
Physics Letters A 373, 422–425, (2009), arXiv:0810.1496 [quant-ph] - Absolute frequency measurement of the 40Ca+ S1/2 - D5/2 clock transition
M. Chwalla, J. Benhelm, K. Kim, G. Kirchmair, T. Monz, M. Riebe, P. Schindler, A. S. Villar, W. Haensel, C. F. Roos, R. Blatt, M. Abgrall, G. Santarelli, G. D. Rovera, Ph Laurent
Physical Review Letters 102, 023002, (2009), arXiv:0806.1414 [physics] - Optimal control of entangling operations for trapped-ion quantum computing
V. Nebendahl, H. Häffner, C. F. Roos
Physical Review A 79, 012312, (2009), arXiv:0809.1414 [quant-ph] - Quantum interference from remotely trapped ions
S Gerber, D Rotter, M Hennrich, R Blatt, F Rohde, C Schuck, M Almendros, R Gehr, F Dubin, J Eschner
New Journal of Physics 11, 013032, (2009), arXiv:0810.1847 [quant-ph] - Realization of the Quantum Toffoli Gate with Trapped Ions
T. Monz, K. Kim, W. Hänsel, M. Riebe, A. S. Villar, P. Schindler, M. Chwalla, M. Hennrich, R. Blatt
Physical Review Letters 102, 040501, (2009), arXiv:0804.0082 [quant-ph], synopsis of the work
2008
- Quantum computing with trapped ions
H. Häffner, C. F. Roos, R. Blatt
Physics Reports 469, 155–203, (2008), arXiv:0809.4368 [quant-ph] - Precision measurement of the branching fractions of the 4p 2P3/2 decay of Ca II
R. Gerritsma, G. Kirchmair, F. Zähringer, J. Benhelm, R. Blatt, C. F. Roos
The European Physical Journal D 50, 13–19, (2008), arXiv:0807.2905 [physics] - Deterministic entanglement swapping with an ion-trap quantum computer
M. Riebe, T. Monz, K. Kim, A. S. Villar, P. Schindler, M. Chwalla, M. Hennrich, R. Blatt
Nature Physics 4, 839–842, (2008), synopsis of the work - Quantum Control of a Trapped Electron Spin in a Quantum Dot Using Photon Polarization
François Dubin, Monique Combescot, Gavin K. Brennen, Romain Melet
Physical Review Letters 101, 217403, (2008) - The conversion of phase to amplitude fluctuations of a light beam by an optical cavity
Alessandro S. Villar
American Journal of Physics 76, 922–929, (2008), arXiv:0805.0528 [quant-ph] - The many-body physics of composite bosons
Monique Combescot, Odile Betbeder-Matibet, François Dubin
Physics Reports 463, 215–320, (2008) - Towards fault-tolerant quantum computing with trapped ions
Jan Benhelm, Gerhard Kirchmair, Christian F. Roos, Rainer Blatt
Nature Physics 4, 463–466, (2008), arXiv:0803.2798 [quant-ph], synopsis of the work - Experimental quantum-information processing with ions
J. Benhelm, G. Kirchmair, C. F. Roos, R. Blatt
Physical Review A 77, 062306, (2008), arXiv:0804.1261 [quant-ph] - Entangled states of trapped atomic ions
Rainer Blatt, David Wineland
Nature 453, 1008–1015, (2008) - Geometric phase gate on an optical transition for ion trap quantum computation
K. Kim, C. F. Roos, L. Aolita, H. Häffner, V. Nebendahl, R. Blatt
Physical Review A 77, 050303, (2008), arXiv:0710.3950 [quant-ph] - Monitoring a single ion's motion by second-order photon correlations
D Rotter, M Mukherjee, F Dubin, R Blatt
New Journal of Physics 10, 043011, (2008) - Nonlinear coupling of continuous variables at the single quantum level
C. F. Roos, T. Monz, K. Kim, M. Riebe, H. Häffner, D. F. V. James, R. Blatt
Physical Review A 77, 040302, (2008), arXiv:0705.0788 [quant-ph] - Dynamics of entanglement
Christian Roos
Nature Physics 4, 97–98, (2008) - Scalable continuous-variable entanglement of light beams produced by optical parametric oscillators
Katiuscia N. Cassemiro, Alessandro S. Villar
Physical Review A 77, 022311, (2008), arXiv:0801.2706 [quant-ph] - Ion trap quantum gates with amplitude-modulated laser beams
Christian F Roos
New Journal of Physics 10, 013002, (2008), arXiv:0710.1204 [quant-ph]
2007
- Precision spectroscopy with two correlated atoms
M. Chwalla, K. Kim, T. Monz, P. Schindler, M. Riebe, C.F. Roos, R. Blatt
Applied Physics B 89, 483–488, (2007), arXiv:0706.3186 [quant-ph] - High-fidelity ion-trap quantum computing with hyperfine clock states
L. Aolita, K. Kim, J. Benhelm, C. F. Roos, H. Häffner
Physical Review A 76, 040303, (2007), arXiv:0707.3916 [quant-ph] - Single-Ion Two-Photon Source
F. Dubin, D. Rotter, M. Mukherjee, S. Gerber, R. Blatt
Physical Review Letters 99, 183001, (2007) - Mixture of composite-boson molecules and the Pauli exclusion principle
M. Combescot, O. Betbeder-Matibet, F. Dubin
Physical Review A 76, 033601, (2007) - Quantum teleportation with atoms: quantum process tomography
M Riebe, M Chwalla, J Benhelm, H Häffner, W Hänsel, C F Roos, R Blatt
New Journal of Physics 9, 211, (2007), arXiv:0704.2027 [quant-ph] - Transfer of trapped atoms between two optical tweezer potentials
M. Schulz, H. Crepaz, F. Schmidt-Kaler, J. Eschner, R. Blatt
Journal of Modern Optics 54, 1619–1626, (2007), arXiv:quant-ph/0606018 - Robust state preparation of a single trapped ion by adiabatic passage
Chr. Wunderlich, Th. Hannemann, T. Körber, H. Häffner, Ch. Roos, W. Hänsel, R. Blatt, F. Schmidt-Kaler
Journal of Modern Optics 54, 1541–1549, (2007), arXiv:quant-ph/0508159 - Photon Correlation versus Interference of Single-Atom Fluorescence in a Half-Cavity
François Dubin, Daniel Rotter, Manas Mukherjee, Carlos Russo, Jürgen Eschner, Rainer Blatt
Physical Review Letters 98, 183003, (2007), arXiv:quant-ph/0610065 - Universal quantum computation in decoherence-free subspaces with hot trapped ions
Leandro Aolita, Luiz Davidovich, Kihwan Kim, Hartmut Häffner
Physical Review A 75, 052337, (2007), arXiv:0706.0203 [quant-ph] - Tomografie eines Quantenzustands – Verschränkung und Reinheit
O. Gühne, H. Häffner
e & i Elektrotechnik und Informationstechnik 124, 131–136, (2007) - Measurement of the hyperfine structure of the transition in
J. Benhelm, G. Kirchmair, U. Rapol, T. Körber, C. F. Roos, R. Blatt
Physical Review A 75, 032506, (2007), arXiv:physics/0611134
2006
- Process Tomography of Ion Trap Quantum Gates
M. Riebe, K. Kim, P. Schindler, T. Monz, P. O. Schmidt, T. K. Körber, W. Hänsel, H. Häffner, C. F. Roos, R. Blatt
Physical Review Letters 97, 220407, (2006) - Generalized spin-squeezing inequalities in -qubit systems: Theory and experiment
J. K. Korbicz, O. Gühne, M. Lewenstein, H. Häffner, C. F. Roos, R. Blatt
Physical Review A 74, 052319, (2006), arXiv:quant-ph/0601038 - ‘Designer atoms’ for quantum metrology
C. F. Roos, M. Chwalla, K. Kim, M. Riebe, R. Blatt
Nature 443, 316–319, (2006), arXiv:quant-ph/0701215 - The exciton many-body theory extended to any kind ofcomposite bosons
M. Combescot, O. Betbeder-Matibet, F. Dubin
The European Physical Journal B - Condensed Matter and Complex Systems 52, 181–189, (2006), arXiv:cond-mat/0604311 - Feedback Cooling of a Single Trapped Ion
Pavel Bushev, Daniel Rotter, Alex Wilson, François Dubin, Christoph Becher, Jürgen Eschner, Rainer Blatt, Viktor Steixner, Peter Rabl, Peter Zoller
Physical Review Letters 96, 043003, (2006), arXiv:quant-ph/0509125
2005
- Scalable multiparticle entanglement of trapped ions
H. Häffner, W. Hänsel, C. F. Roos, J. Benhelm, D. Chek-al-kar, M. Chwalla, T. Körber, U. D. Rapol, M. Riebe, P. O. Schmidt, C. Becher, O. Gühne, W. Dür, R. Blatt
Nature 438, 643–646, (2005), arXiv:quant-ph/0603217 - Robust entanglement
H. Häffner, F. Schmidt-Kaler, W. Hänsel, C. F. Roos, T. Körber, M. Chwalla, M. Riebe, J. Benhelm, U. D. Rapol, C. Becher, R. Blatt
Applied Physics B 81, 151–153, (2005), arXiv:quant-ph/0508021 - Experimental and theoretical study of the 3d²D–level lifetimes of ⁴⁰Ca⁺
A. Kreuter, C. Becher, G. P. T. Lancaster, A. B. Mundt, C. Russo, H. Häffner, C. Roos, W. Hänsel, F. Schmidt-Kaler, R. Blatt, M. S. Safronova
Physical Review A 71, 032504, (2005) - Scalable ion trap quantum computing without moving ions
L. Tian, R. Blatt, P. Zoller
The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics 32, 201–208, (2005), arXiv:quant-ph/0412186 - Single photons on demand from 3D photonic band-gap structures
M. Florescu, S. Scheel, H. Häffner, H. Lee, D. Strekalov, P. L. Knight, J. P. Dowling
Europhysics Letters 69, 945, (2005)
2004
- A single-photon source based on a single Ca+ ion
Christian Maurer, Christoph Becher, Carlos Russo, Jürgen Eschner, Rainer Blatt
New Journal of Physics 6, 94, (2004) - Bell States of Atoms with Ultralong Lifetimes and Their Tomographic State Analysis
C. F. Roos, G. P. T. Lancaster, M. Riebe, H. Häffner, W. Hänsel, S. Gulde, C. Becher, J. Eschner, F. Schmidt-Kaler, R. Blatt
Phys. Rev. Lett. 92, 220402, (2004), synopsis of the work - Forces between a Single Atom and Its Distant Mirror Image
Pavel Bushev, Alex Wilson, Jürgen Eschner, Christoph Raab, Ferdinand Schmidt-Kaler, Christoph Becher, Rainer Blatt
Physical Review Letters 92, 223602, (2004), arXiv:quant-ph/0311023 - Deterministic quantum teleportation with atoms
M. Riebe, H. Häffner, C. F. Roos, W. Hänsel, J. Benhelm, G. P. T. Lancaster, T. W. Körber, C. Becher, F. Schmidt-Kaler, D. F. V. James, R. Blatt
Nature 429, 734–737, (2004), Science Perspectives, synopsis of the work - Interfacing Quantum-Optical and Solid-State Qubits
L. Tian, P. Rabl, R. Blatt, P. Zoller
Physical Review Letters 92, 247902, (2004), arXiv:quant-ph/0310057 - Spontaneous Emission Lifetime of a Single Trapped Ion in a High Finesse Cavity
A. Kreuter, C. Becher, G. P. T. Lancaster, A. B. Mundt, C. Russo, H. Häffner, C. Roos, J. Eschner, F. Schmidt-Kaler, R. Blatt
Physical Review Letters 92, 203002, (2004) - Quantized AC-Stark shifts and their use for multiparticle entanglement and quantum gates
F. Schmidt-Kaler, H. Häffner, S. Gulde, M. Riebe, G. Lancaster, J. Eschner, C. Becher, R. Blatt
Europhysics Letters 65, 587, (2004)
2003
- How to realize a universal quantum gate with trapped ions
F. Schmidt-Kaler, H. Häffner, S. Gulde, M. Riebe, G. P. T. Lancaster, T. Deuschle, C. Becher, W. Hänsel, J. Eschner, C. F. Roos, R. Blatt
Applied Physics B 77, 789–796, (2003), arXiv:quant-ph/0312162 - Vacuum-Field Level Shifts in a Single Trapped Ion Mediated by a Single Distant Mirror
M. A. Wilson, P. Bushev, J. Eschner, F. Schmidt-Kaler, C. Becher, R. Blatt, U. Dorner
Physical Review Letters 91, 213602, (2003), arXiv:quant-ph/0306159 - Doppler cooling a single Ca+ ion with a violet extended-cavity diode laser
G.P.T. Lancaster, H. Häffner, M.A. Wilson, C. Becher, J. Eschner, F. Schmidt-Kaler, R. Blatt
Applied Physics B 76, 805–808, (2003) - Laser cooling of trapped ions
Jürgen Eschner, Giovanna Morigi, Ferdinand Schmidt-Kaler, Rainer Blatt
J. Opt. Soc. Am. B 20, 1003–1015, (2003), Selected for the May 2003 issue of the Virtual Journal of Quantum Information - Precision Measurement and Compensation of Optical Stark Shifts for an Ion-Trap Quantum Processor
H. Häffner, S. Gulde, M. Riebe, G. Lancaster, C. Becher, J. Eschner, F. Schmidt-Kaler, R. Blatt
Physical Review Letters 90, 143602, (2003), arXiv:physics/0212040, Selected for the April 2003 issue of the Virtual Journal of Quantum Information - Sub-wavelength resolution of optical fields probed by single trapped ions: Interference, phase modulation, and which-way information
J. Eschner
The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics 22, 341–345, (2003) - Quantum dynamics of single trapped ions
D. Leibfried, R. Blatt, C. Monroe, D. Wineland
Reviews of Modern Physics 75, 281–324, (2003) - Realization of the Cirac–Zoller controlled-NOT quantum gate
Ferdinand Schmidt-Kaler, Hartmut Häffner, Mark Riebe, Stephan Gulde, Gavin P. T. Lancaster, Thomas Deuschle, Christoph Becher, Christian F. Roos, Jürgen Eschner, Rainer Blatt
Nature 422, 408–411, (2003), News & Views, Download parallel article from NIST group, synopsis of the work - Phonon–phonon interactions due to non-linear effects in a linear ion trap
C. Marquet, F. Schmidt-Kaler, D.F.V. James
Applied Physics B 76, 199–208, (2003), arXiv:quant-ph/0211079 - Coherent coupling of a single 40Ca+ ion to a high-finesse optical cavity
A. B. Mundt, A. Kreuter, C. Russo, C. Becher, D. Leibfried, J. Eschner, F. Schmidt-Kaler, R. Blatt
Applied Physics B 76, 117–124, (2003) - Is an ion string laser-cooled like a single ion?
Giovanna Morigi, Jürgen Eschner
Journal of Physics B: Atomic, Molecular and Optical Physics 36, 1041, (2003) - The coherence of qubits based on single Ca+ ions
F. Schmidt-Kaler, S. Gulde, M. Riebe, T. Deuschle, A. Kreuter, G. Lancaster, C. Becher, J. Eschner, H. Häffner, R. Blatt
Journal of Physics B: Atomic, Molecular and Optical Physics 36, 623, (2003) - Implementation of the Deutsch–Jozsa algorithm on an ion-trap quantum computer
Stephan Gulde, Mark Riebe, Gavin P. T. Lancaster, Christoph Becher, Jürgen Eschner, Hartmut Häffner, Ferdinand Schmidt-Kaler, Isaac L. Chuang, Rainer Blatt
Nature 421, 48–50, (2003)
2002
- Coupling a Single Atomic Quantum Bit to a High Finesse Optical Cavity
A. B. Mundt, A. Kreuter, C. Becher, D. Leibfried, J. Eschner, F. Schmidt-Kaler, R. Blatt
Phys. Rev. Lett. 89, 103001, (2002) - Optical decay from a Fabry–Perot cavity faster than the decay time
H. Rohde, J. Eschner, F. Schmidt-Kaler, R. Blatt
J. Opt. Soc. Am. B 19, 1425–1429, (2002)
2001
- Doppler cooling of a Coulomb crystal
Giovanna Morigi, Jürgen Eschner
Phys. Rev. A 64, 063407, (2001) - Light interference from single atoms and their mirror images
J. Eschner, Ch. Raab, F. Schmidt-Kaler, R. Blatt
Nature 413, 495–498, (2001) - Delicate information
Rainer Blatt
Nature 412, 773–773, (2001) - Laser cooling with electromagnetically induced transparency: application to trapped samples of ions or neutral atoms
F. Schmidt-Kaler, J. Eschner, G. Morigi, C. F. Roos, D. Leibfried, A. Mundt, R. Blatt
Applied Physics B 73, 807–814, (2001) - Simple and efficient photo-ionization loading of ions for precision ion-trapping experiments
S. Gulde, D. Rotter, P. Barton, F. Schmidt-Kaler, R. Blatt, W. Hogervorst
Applied Physics B 73, 861–863, (2001) - Sympathetic ground-state cooling and coherent manipulation with two-ion crystals
H. Rohde, S. T. Gulde, C. F. Roos, P. A. Barton, D. Leibfried, J. Eschner, F. Schmidt-Kaler, R. Blatt
Journal of Optics B: Quantum and Semiclassical Optics 3, S34, (2001)
2000
- Experimental Demonstration of Ground State Laser Cooling with Electromagnetically Induced Transparency
C. F. Roos, D. Leibfried, A. Mundt, F. Schmidt-Kaler, J. Eschner, R. Blatt
Phys. Rev. Lett. 85, 5547–5550, (2000) - Ground State Laser Cooling Using Electromagnetically Induced Transparency
Giovanna Morigi, Jürgen Eschner, Christoph H. Keitel
Phys. Rev. Lett. 85, 4458–4461, (2000), arXiv:quant-ph/0005009 - Speed of ion-trap quantum-information processors
A. Steane, C. F. Roos, D. Stevens, A. Mundt, D. Leibfried, F. Schmidt-Kaler, R. Blatt
Phys. Rev. A 62, 042305, (2000) - Motional Sidebands and Direct Measurement of the Cooling Rate in the Resonance Fluorescence of a Single Trapped Ion
Ch. Raab, J. Eschner, J. Bolle, H. Oberst, F. Schmidt-Kaler, R. Blatt
Phys. Rev. Lett. 85, 538–541, (2000) - Push-button entanglement
Rainer Blatt
Nature 404, 231–232, (2000) - Investigating a qubit candidate: Spectroscopy on the to transition of a trapped calcium ion in a linear Paul trap
H. C. Nägerl, Ch. Roos, D. Leibfried, H. Rohde, G. Thalhammer, J. Eschner, F. Schmidt-Kaler, R. Blatt
Phys. Rev. A 61, 023405, (2000)
1999
- Quantum State Engineering on an Optical Transition and Decoherence in a Paul Trap
Ch. Roos, Th. Zeiger, H. Rohde, H. C. Nägerl, J. Eschner, D. Leibfried, F. Schmidt-Kaler, R. Blatt
Phys. Rev. Lett. 83, 4713–4716, (1999) - Individual addressing and state readout of trapped ions utilizing rf micromotion
D. Leibfried
Physical Review A 60, R3335–R3338, (1999) - Laser addressing of individual ions in a linear ion trap
H. C. Nägerl, D. Leibfried, H. Rohde, G. Thalhammer, J. Eschner, F. Schmidt-Kaler, R. Blatt
Phys. Rev. A 60, 145–148, (1999) - Laser cooling of two trapped ions: Sideband cooling beyond the Lamb-Dicke limit
G. Morigi, J. Eschner, J. I. Cirac, P. Zoller
Phys. Rev. A 59, 3797–3808, (1999)
1998
- Ion strings for quantum gates
H. C. Nägerl, W. Bechter, J. Eschner, F. Schmidt-Kaler, R. Blatt
Applied Physics B 66, 603–608, (1998) - Coherent excitation of normal modes in a string of Ca ions
H. C. Nägerl, D. Leibfried, F. Schmidt-Kaler, J. Eschner, R. Blatt
Opt. Express 3, 89–96, (1998) - Diode laser spectrometer at 493 nm for single trapped Ba+ ions
C. Raab, J. Bolle, H. Oberst, J. Eschner, F. Schmidt-Kaler, R. Blatt
Applied Physics B 67, 683–688, (1998)
1996
- Trapped ions in the strong-excitation regime: Ion interferometry and nonclassical states
J. F. Poyatos, J. I. Cirac, R. Blatt, P. Zoller
Phys. Rev. A 54, 1532–1540, (1996) - Quantum tricks in ion traps
Rainer Blatt
Physics World 9, 25, (1996) - Quantengatter für Quantenrechner
R. Blatt, P. Zoller
Physikalische Blätter 52, (1996)
- Motion tomography of a single trapped ion
J. F. Poyatos, R. Walser, J. I. Cirac, P. Zoller, R. Blatt
Phys. Rev. A 53, R1966–R1969, (1996)
