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Edge Theories in Projected Entangled Pair State Models

Date: 
2014-01-23
Author(s): 

S. Yang, L. Lehman, D. Poilblanc, K. Van Acoleyen, F. Verstraete, J. I. Cirac, and N. Schuch

Reference: 

Phys. Rev. Lett. 112, 036402

We analyze the low energy excitations of spin lattice systems in two dimensions at zero temperature within the framework of projected entangled pair state models. Perturbations in the bulk give rise to physical excitations located at the edge.

Observation of Quantized Conductance in Neutral Matter

Date: 
2015-01-08
Author(s): 

Sebastian Krinner, David Stadler, Dominik Husmann, Jean-Philippe Brantut, Tilman Esslinger

Reference: 

Nature 517, 64-67 (2015)

In transport experiments the quantum nature of matter becomes directly evident when changes in conductance occur only in discrete steps, with a size determined solely by Planck's constant h. The observations of quantized steps in the electric conductance have provided important insights into the physics of mesoscopic systems and allowed for the development of quantum electronic devices. Even though quantized conductance should not rely on the presence of electric charges, it has never been observed for neutral, massive particles.

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.

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)

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).

An Atomic Clock with 10–18 Instability

N. Hinkley, J. A. Sherman, N. B. Phillips, M. Schioppo, N. D. Lemke, K. Beloy, M. Pizzacaro, C. W. Oates and A. D. Ludlow
Science 341 1215-1218 (2013)

Atomic clocks have been instrumental in science and technology, leading to innovations such as global
positioning, advanced communications, and tests of fundamental constant variation. Timekeeping precision
at 1 part in 1018 enables new timing applications in relativistic geodesy, enhanced Earth- and space-based
navigation and telescopy, and new tests of physics beyond the standard model.

Enhanced sensitivity of the LIGO gravitational wave detector by using squeezed states of light

J. Aasi, et al.
Nature Photonics 7, 613–619 (2013)

A global network of observatories is seeking to directly detect gravitational waves using precision laser
interferometry. Photon shot noise, due to the quantum nature of light, imposes a fundamental limit on the
attometre-level sensitivity of the kilometre-scale Michelson interferometers deployed for this task.

Nondestructive Detection of an Optical Photon

A. Reiserer, S. Ritter and G. Rempe
Science 342, 1349-1351 (2013)

Photonic Floquet topological insulators

M. C. Rechtsman, J. M. Zeuner, Y. Plotnik, Y. Lumer, D. Podolsky, F. Dreisow, S. Nolte, M. Segev and A. Szameit
Nature 496, 196-200 (2013)

Macroscopic quantum self-trapping and Josephson oscillations of exciton polaritons

M. Abbarchi, A. Amo, V.G. Sala, D. Solnyshkov, H. Flayac, L. Ferrier, I. Sagnes, E. Galopin, A. Lemaitre, G. Malpuech and J. Bloch
Nature Physics 9, 275-279 (2013)

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