Highlights for QUTE-EUROPE

Results tagged as highlights of the project.

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Apr 5, 2015

Observation of chiral currents with ultracold atoms in bosonic ladders

M. Atala, M. Aidelsburger, M. Lohse, J. T. Barreiro, B. Paredes, I. Bloch
Nature Physics 10, 588–593 (2014)

Apr 5, 2015

Measuring the Chern number of Hofstadter bands with ultracold bosonic atoms

M. Aidelsburger, M. Lohse, C. Schweizer, M. Atala, J. T. Barreiro, S. Nascimbène, N. R. Cooper, I. Bloch, N. Goldman
Nature Physics 11, 162-166 (2015), published online AOP 3171 (2014)

The quantum Hall effect has led to a deeper understanding of topological (or geometrical) effects in physics and has found generalizations in the spin quantum Hall effect and topological insulators. The plateaux in conductivity in this effect are attributed to the Chern numbers, a topological invariant characterizing the Bloch bands.

Apr 5, 2015

Experimental simulation of the Haldane model in two different platforms

Experimental realization of the topological Haldane model with ultracold fermions
G. Jotzu, M. Messer, R. Desbuquois, M. Lebrat, T. Uehlinger, D. Greif, T. Esslinger
Nature 515, 237–240 (2014);
Observation of topological transitions in interacting quantum circuits

Apr 5, 2015

Coherent suppression of electromagnetic dissipation due to superconducting quasiparticles

I. M. Pop, K. Geerlings, G. Catelani, R. J. Schoelkopf, L.I. Glazman, M. H. Devoret Nature 508, 369–372 (2014)

While superconducting qubits represent a promising technological platform for quantum computation, a good enough control of the mechanisms of decoherence and dissipation in these systems is still an experimental challenge. In particular, Josephson’s key theoretical prediction that quasiparticle dissipation should vanish in transport through a junction when the phase difference across the junction is π has never been observed.

Apr 5, 2015

Two implementations of quantum error-correcting techniques

Superconducting quantum circuits at the surface code threshold for fault tolerance
R. Barends, J. Kelly, A. Megrant, A. Veitia, D. Sank, E. Jeffrey, T. C. White, J. Mutus, A. G. Fowler, B. Campbell, Y. Chen, Z. Chen, B. Chiaro, A. Dunsworth, C. Neill, P. O’Malley, P. Roushan, A. Vainsencher, J. Wenner, A. N. Korotkov, A. N. Cleland, J. M. Martinis
Nature 508, 500-503 (2014);
Quantum computations on a topologically encoded qubit

Apr 5, 2015

Quantum control and process tomography of a semiconductor quantum dot hybrid qubit

D. Kim, Z. Shi, C. B. Simmons, D. R. Ward, J. R. Prance, T. S. Koh, J. K. Gamble, D. E. Savage, M. G. Lagally, M. Friesen, S. N. Coppersmith, M. A. Eriksson
Nature 511, 70-74 (2014)

Apr 5, 2015

Electron spins in silicon -- a promising candidate for fault-tolerant qubits

Electrical control of a long-lived spin qubit in a Si/SiGe quantum dot
E. Kawakami, P. Scarlino, D. R. Ward, F. R. Braakman, D. E. Savage, M. G. Lagally, M. Friesen, S. N. Coppersmith, M. A. Eriksson, L. M. K. Vandersypen
Nature Nanotechnology 9, 666-670 (2014);
An addressable quantum dot qubit with fault-tolerant control-fidelity
M. Veldorst, J. C. C. Hwang, C. H. Yang, A. W. Leenstra, B. de Ronde, J. P. Dehollain, J. T. Muhonen, F. E. Hudson, K. M. Itoh, A. Morello, A.S. Dzurak
Nature Nanotechnology 9, 981–985 (2014);

Mar 22, 2014

Deterministic quantum teleportation with feed-forward in a solid state system

L. Steffen, Y. Salathe, M. Oppliger, P. Kurpiers, M. Baur, C. Lang, C. Eichler, G. Puebla-Hellmann, A. Fedorov and A. Wallraff.
Nature 500, 319-322 (2013)

Demonstrations of primitive information processing elements with quantum bits (qubits) have been
implemented in many systems, but the requirements for precise quantum control, along with fast classical
feed-forward (conditioning future operations on measurement results) has proved challenging.

Mar 22, 2014

Room-Temperature Quantum Bit Storage Exceeding 39 Minutes Using Ionized Donors in Silicon-28

K. Saeedi, S. Simmons, J. Z. Salvail, P. Dluhy, H. Riemann, N. V. Abrosimov, P. Becker, H.-J. Pohl, J. L. Morten and M. L. W. Thewalt
Science 342, 830-833 (2013)

Mar 22, 2014

All-Optical Switch and Transistor Gated by One Stored Photon

W. Chen, K.M. Beck, R. Bücker, M. Gullans, M.D. Lukin, H. Tanji-Suzuki and V. Vuletić.
Science 341, 768-770 (2013).

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