Highlight

Claude E. Shannon Award first time for QIPC researcher

Summary: 

Congratulations to Professor Alexander S. Holevo from Stekhlov Mathematical Institute in Moscow (Russia) who was selected to be awarded the prestiguous Claude E. Shannon Award 2016.

Congratulations to Professor Alexander S. Holevo from Stekhlov Mathematical Institute in Moscow (Russia) who was selected to be awarded the prestiguous Claude E. Shannon Award 2016.

QIPC Young Investigator Award 2015 goes to Oriol Romero Isart

Summary: 

We are ahppy to anounce that this year's winner of QIPC Young Investigator Award is Oriol Romero Isart from University of Innsbruck (https://iqoqi.at/en/romero-isart-gruppe/staff/oriol-romero-isart)

"for his seminal contributions to many interdisciplinary topics in quantum physics, which range from degenerate quantum gases to quantum nanooptics and opto-nanomechanics, and have opened new doors both for theory and for experiments."

Quantum many-body systems out of equilibrium

Date: 
2015-02-03
Author(s): 

J. Eisert, M. Friesdorf, C. Gogolin

Reference: 

Nature Physics 11, 124–130 (2015)

How do closed quantum many-body systems driven out of equilibrium eventually achieve equilibration? And how do these systems thermalize, given that they comprise so many degrees of freedom? Progress in answering these—and related—questions has accelerated in recent years—a trend that can be partially attributed to success with experiments performing quantum simulations using ultracold atoms and trapped ions.

Variational matrix product operators for the steady state of dissipative quantum systems

Date: 
2015-05-26
Author(s): 

Jian Cui, J. Ignacio Cirac, Mari Carmen Bañuls

Reference: 

Phys. Rev. Lett. (to appear, May 2015)

We present a new variational method, based on the matrix product operator (MPO) ansatz, for finding the steady state of dissipative quantum chains governed by master equations of the Lindblad form.

Subwavelength vacuum lattices and atom-atom interactions in photonic crystals

Date: 
2015-05-26
Author(s): 

A. González-Tudela, C.-L. Hung, D. E. Chang, J. I. Cirac, H. J. Kimble

Reference: 

Nature Photonics, 9, 320-325 (2015)

URL: 

10.1038/nphoton.2015.54

We propose the use of photonic crystal structures to design subwavelength optical lattices in two dimensions for ultracold atoms by using both Guided Modes and Casimir-Polder forces. We further show how to use Guided Modes for photon-induced large and strongly long-range interactions between trapped atoms. Finally, we analyze the prospects of this scheme to implement spin models for quantum simulation.

Gauging quantum states: From Global to Local Symmetries in Many-Body Systems

Date: 
2015-02-27
Author(s): 

J. Haegeman, K. Van Acoleyen, N. Schuch, J. I. Cirac, F. Verstraete

Reference: 

Phys. Rev. X 5, 011024

We present a mapping of quantum many body states with a global symmetry to states with local gauge symmetry. The prescription implements the principle of minimal coupling at the level of individual quantum states as opposed to Hamiltonians or Lagrangians. Using the formalism of projected entangled-pair states (PEPS), we construct an associated gauging map for Hamiltonians and show how this results in a frustration free gauge theory Hamiltonian.

Chiral projected entangled-pair state with topological order

Date: 
2014-12-03
Author(s): 

Shuo Yang, Thorsten B. Wahl, Hong-Hao Tu, Norbert Schuch, and J. Ignacio Cirac

Reference: 

Phys. Rev. Lett. 114, 106803 (2015)

We show that projected entangled-pair states (PEPS) can describe chiral topologically ordered phases. For that, we construct a simple PEPS for spin-1/2 particles in a two-dimensional lattice. We reveal a symmetry in the local projector of the PEPS that gives rise to the global topological character. We also extract characteristic quantities of the edge conformal field theory using the bulk-boundary correspondence.

Revealing Genuine Optical-Path Entanglement

Date: 
2015-05-01
Author(s): 

F. Monteiro, V. Caprara Vivoli, T. Guerreiro, A. Martin, J.-D. Bancal, H. Zbinden, R. T. Thew, and N. Sangouard

Reference: 

Phys. Rev. Lett. 114, 170504 (2015)

How can one detect entanglement between multiple optical paths sharing a single photon? We address this question by proposing a scalable protocol, which only uses local measurements where single photon detection is combined with small displacement operations. The resulting entanglement witness does not require postselection, nor assumptions about the photon number in each path. Furthermore, it guarantees that entanglement lies in a subspace with at most one photon per optical path and reveals genuinely multipartite entanglement.

Quantum seismology

E. G. Brow, W. Donnelly, A. Kempf, R. B. Mann, E. Martín-Martínez, and N. C. Menicucci
New Journal of Physics 16, 105020 (2014)

Entanglement farming is a protocol that involves successively sending pairs of “particle detectors” (such as atoms, ions, molecules, etc) transversely through an optical cavity. As pair after pair traverses the cavity, the field approaches a fixed-point state, where every pair of atoms emerges from the cavity in the same state, which is generically entangled. The fixed point is generally stable to small changes in the parameters.

Use of quantum error correction techniques to improve the sensitivity of quantum metrology in noisy scenarios

Increasing Sensing Resolution with Error Correction
G. Arrad, Y. Vinkler, D. Aharonov, A. Retzker
Phys. Rev. Lett. 112, 150801 (2014);
Quantum Error Correction for Metrology
E.  M. Kessler, I. Lovchinsky, A.  O. Sushkov, M.  D. Lukin
Phys. Rev. Lett. 112, 150802 (2014);
Improved Quantum Metrology Using Quantum Error Correction
W. Dür, M. Skotiniotis, F. Fröwis, B. Kraus
Phys. Rev. Lett. 112, 080801 (2014)

Syndicate content