Quantum mechanics is at the heart of our technology and economy - the laser and the transistor are quantum devices - but its full potential is far from being realized. Recent technological advances in optics, nanoscience and engineering allow experimentalists to create artificial structures or put microscopic and mesoscopic systems under new manipulable conditions in which quantum phenomena play a fundamental role.

Quantum technologies exploit these effects with practical purposes. The objective of Quantum Science is to discover, study, and control quantum efects at a fundamental level. These are two sides of a virtuous circle: new technologies lead to the discovery and study of new phenomena that will lead to new technologies.

Our aim is  to control and understand quantum phenomena in a multidisciplinary intersection of  Quantum Information, Quantum optics and cold atoms, Quantum Control, Spintronics, Quantum metrology, Atom interferometry, Superconducting qubits and Circuit QED and Foundations of Quantum Mechanics.

QUINST is funded in part as a “Grupo Consolidado” from the Basque Government (IT472-10, IT986-16, IT1470-22)  and functions as a network of groups with their own funding, structure, and specific goals.  


Latest events

Seminar Seminar

Bernd Oliver Viehmann (U. of Regensburg & UPV/EHU)

When and where

From: 11/2010 To: 11/2016


2009/10/06,  Bernd Oliver Viehmann (U. of Regensburg & UPV/EHU)

Place: Sala de Seminarios del Departamento de Física Teórica e Historia de la Ciencia
Time: 12h.
Title: Theory of multipartite entanglement in terms of the tangle measures

Classification and quantification of multipartite entanglement can be tackled by means of certain locally SL-invariant polynomials in the coefficients of quantum states - the tangle measures. The entanglement of two- and three-qubit systems as measured by these quantities may be already considered as thoroughly understood. However, the major
challenges in this context are, first, the construction and interpretation of the corresponding polynomial invariants for more general Hilbert spaces, and, second, the explicit evaluation of the tangle measures for mixed states.

This talk tries to shed some light on both issues: The relation of polynomial invariants of four-qubit states and the so-called SLOCC classification of entanglement will be investigated. Furthermore, a theorem about the 1-tangle of rank two states will be presented.