Highlight

Hologram of a Single Photon

Date: 
2016-01-11
Author(s): 

Radosław Chrapkiewicz, Michał Jachura, Konrad Banaszek, Wojciech Wasilewski

The spatial structure of single photons is becoming an extensively explored resource used for facilitating the free-space quantum key distribution and quantum computation as well as for benchmarking the limits of quantum entanglement generation with orbital angular momentum modes or reduction of the photon free-space propagation speed.

Mode engineering for realistic quantum-enhanced interferometry

Date: 
2016-04-29
Author(s): 

Michał Jachura, Radosław Chrapkiewicz, Rafał Demkowicz-Dobrzański, Wojciech Wasilewski, Konrad Banaszek

Reference: 

Nature Communications 7, 11411 (2016) http://arxiv.org/pdf/1504.05435.pdf

Quantum metrology overcomes standard precision limits by exploiting collective quantum superpositions of physical systems used for sensing, with the prominent example of non-classical multiphoton states improving interferometric techniques. Practical quantum-enhanced interferometry is, however, vulnerable to imperfections such as partial distinguishability of interfering photons. Here we introduce a method where appropriate design of the modal structure of input photons can alleviate deleterious effects caused by another, experimentally inaccessible degree of freedom.

Nonlinear quantum optics mediated by Rydberg interactions

Date: 
2016-02-19
Author(s): 

Ofer Firstenberg, Charles S. Adams, Sebastian Hofferberth

Reference: 

arXiv:1602.06117v1

URL: 

arXiv:1602.06117v1

By mapping the strong interaction between Rydberg excitations in ultra-cold atomic ensembles onto single photons via electromagnetically induced transparency it is now possible to realize a nonlinear optical medium which can modify light on the level of individual photons.

SIQS 2016 workshop

Date: 
2016-03-14 - 2016-03-18
Place: 
Venice International University - San Servolo - Venice

Annual gathering of all the groups involved in the Project SIQS

 

See attachment for the workshop schedule

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.

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