Microtrap Fabrication Technology for
Trapped Ion Quantum Information Science

Refer to News items for Microtrap publications

NPL:

Measurement of the electric quadrupole moment of the 4d²D_5/2 level in ⁸⁸Sr⁺
G P Barwood, H S Margolis, G Huang, P Gill and H A Klein Phys. Rev. Lett 93 133001 (2004)

Hertz-level measurement of the optical clock frequency in a single ⁸⁸Sr⁺ ion
H S Margolis, G P Barwood, G Huang, H A Klein, S N Lea, K Szymaniec, P Gill Science 306 1355 (2004)

Improved three-dimensional control of a single strontium ion in an endcap trap
AG Sinclair, MA Wilson and P Gill 2001 Opt Commun. 190, 193-203

Precision lifetime measurement of the metastable 4d²D_5/2 state in ⁸⁸Sr⁺ using a single trapped ion
V Letchumanan, M A Wilson, P Gill and A G Sinclair 2005 Phys. Rev. A 72 012509

Innsbruck:

Towards fault-tolerant quantum computing with trapped ions,
J. Benhelm, G. Kirchmair, C. F. Roos, R. Blatt, Nature Physics 4, 463 (2008)

Deterministic entanglement of ions in thermal states of motion,
G. Kirchmair, J. Benhelm, F. Zähringer, R. Gerritsma, C. F. Roos, R. Blatt, New. J. Phys. 11, 023002 (2009)

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 (2009

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, and R. Blatt, Phys. Rev. Lett. 97, 220407 (2006)

Teleportation with atoms: quantum process tomography,
M. Riebe, M. Chwalla, J. Benhelm, H. Häffner, W. Hänsel, C. F. Roos and R. Blatt, New J. Phys. 9, 211 (2007)

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, Phys. Rev. Lett. 102, 040501 (2009)

Deterministic entanglement swapping with an ion trap quantum computer,
M. Riebe, T. Monz, A. S. Villar, P. Schindler, M. Chwalla, M. Hennrich, R. Blatt, Nature Physics 4, 839 (2008)

Absolute frequency measurement of the ⁴⁰Ca⁺ 4s²S_1/2 - 3d²D_5/2 clock transition,
M. Chwalla, J. Benhelm, K. Kim, G. Kirchmair, T. Monz, M. Riebe, P. Schindler, A. S. Villar, W. Hänsel, C. F. Roos, R. Blatt, M. Abgrall, G. Santarelli, G. D. Rovera, Ph. Laurent, Phys. Rev. Lett. 102, 023002 (2009)

Aarhus:

Rotational state resolved photodissociation spectroscopy of translationally and vibrationally cold MgH+ ions: toward rotational cooling of molecular ions
Højbjerre K, Hansen A.K, Skyt P.S, Staanum PF. & Drewsen, M, New J. Phys. 11 055026 (2009).

Rotational cooling of molecular ions through laser-induced coupling to the collective modes of a two-ion Coulomb crystal
Vogelius I.S, Madsen L.B. and Drewsen M, J. Phys. B 39 S1267 (2006).

Observation of Three-Dimensional Long-Range Order in Small Ion Coulomb Crystals in an rf Trap,
Mortensen A, Nielsen E, Matthey T. and Drewsen M, 2006. Phys. Rev. Lett. 96 103001 (2006).

Radio frequency field-induced persistent long-range ordered structures in two-species ion Coulomb crystals
Mortensen A., Nielsen E, Matthey T and Drewsen M., J Phys. B 40 F223 (2007).

Realization of collective strong coupling with ion Coulomb crystals in an optical cavity,
Herskind P.F, Dantan A, Marler J.P, Albert M. and Drewsen M, Nat. Phys. 5 494 (2009).

Oxford:

How to build a 300 bit, 1 Giga-operation quantum computer
A. M. Steane, Quant.Inf.Comp.7, 171 (2007), quant-ph/0412165.

Deterministic entanglement and tomography of ion spin qubits
J. P. Home, M. J. McDonnell, D. M. Lucas, G. Imreh, B. C. Keitch, D. J. Szwer, N. R. Thomas, S. C. Webster, D. N. Stacey and A. M. Steane, New J. Phys. 8, 188 (2006).

Long-lived mesoscopic entanglement outside the Lamb-Dicke regime
M. J. McDonnell, J. P. Home, D. M. Lucas, G. Imreh, B. C. Keitch, D. J. Szwer, N. R. Thomas, S. C. Webster, D. N. Stacey, and A. M. Steane, Phys. Rev. Lett. 98, 063603 (2007).

A long-lived memory qubit on a low-decoherence quantum bus
D. M. Lucas, B. C. Keitch, J. P. Home, G. Imreh, M. J. McDonnell, D. N. Stacey, D. J. Szwer and A. M. Steane, arXiv:0710.4421v1 (2007).

Memory coherence of a sympathetically-cooled trapped-ion qubit
J. P. Home, M. J. McDonnell, D. J. Szwer, B. C. Keitch, D. M. Lucas, D. N. Stacey and A. M. Steane. Phys. Rev. A79, 050305 (2009).

Siegen:

Quantum measurements and new concepts for experiments with trapped ions,
Ch. Wunderlich, Ch. Balzer, Advances in Atomic, Molecular, and Optical Physics Vol. 49, Academic Press, 2003, 295-376.

Self-learning estimation of quantum states,
Th. Hannemann, D. Reiß, Ch. Balzer, W. Neuhauser, P. E. Toschek, and Ch. Wunderlich Phys. Rev. A 65, 050303 - 1-4 (Rapid Comm.) (2002).

Conditional spin resonance with trapped ions,
Ch. Wunderlich in Laser Physics at the Limit, Springer, Heidelberg-Berlin-New York, 2002, 261-271;

Ion trap quantum logic using long wavelength radiation,
F. Mintert and Ch. Wunderlich Phys. Rev. Lett. 87, 257904 (2001).

Two-dimensional cluster-state preparation with linear ion traps,
H. Wunderlich, Chr. Wunderlich, K. Singer and F. Schmidt-Kaler Physical Review A 79, 052324 (2009).

Quantum simulations with cold trapped ions,
M. Johanning, A. F. Varon, Chr. Wunderlich J. Phys. B 42, 154009 (2009)

Error-resistant single-qubit gates with trapped ions,
N. Timoney, V. Elman, S. Glaser et al, Phys. Rev. A 77, 052334 (2008)

Scrutinizing single-qubit quantum channels: Theory and experiment with trapped ions,
T. Hannemann, Chr. Wunderlich, M. Ziman, M. Plesch, and V. Buzek arXiv:0904.0923v1 (2009).

Ulm:

Realization of the Cirac-Zoller controlled-NOT quantum gate
F. Schmidt-Kaler, H. Häffner, M. Riebe, S. Gulde, G. P. T. Lancaster, T. Deuschle, C. Becher, C. F. Roos, J. Eschner, R. Blatt, Nature 422, 408 (2003).

Control and Measurement of Three-Qubit Entangled States,
C. Roos, M. Riebe, H. Häffner, W. Hänsel, J. Benhelm, G. Lancaster, C. Becher, F. Schmidt-Kaler, R. Blatt, Science 304, 1478 (2004).

Deterministic Quantum Teleportation with Atoms,
M. Riebe, H. Häffner, C. Roos, W. Hänsel, J. Benhelm, G. Lancaster, C. Becher, F. Schmidt-Kaler, D. James, R. Blatt, Nature 429, 734 (2004).

Tomography of entangled massive particles,
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).

Employing trapped cold ions to verify the quantum Jarzynski equality
G. Huber, F. Schmidt-Kaler, S. Deffner, E. Lutz, Phys. Rev. Lett. 101, 070403 (2008).

Deterministic Ultracold Ion Source Targeting the Heisenberg Limit
W. Schnitzler, N. M. Linke, R. Fickler, J. Meijer, F. Schmidt-Kaler, and K. Singer1, PRL 102, 070501 (2009).

Two-dimensional cluster-state preparation with linear ion traps
H. Wunderlich, C. Wunderlich, K. Singer, F. Schmidt-Kaler, Phys. Rev. A 79, 052324 (2009).