Skip to main content

Research Repository

Advanced Search

Accessible quantification of multiparticle entanglement

Cianciaruso, Marco; Bromley, Thomas R.; Adesso, Gerardo


Marco Cianciaruso

Thomas R. Bromley


Entanglement is a key ingredient for quantum technologies and a fundamental signature of quantumness in a broad range of phenomena encompassing many-body physics, thermodynamics, cosmology and life sciences. For arbitrary multiparticle systems, entanglement quantification typically involves nontrivial optimisation problems, and it may require demanding tomographical techniques. Here, we develop an experimentally feasible approach to the evaluation of geometric measures of multiparticle entanglement. Our framework provides analytical results for particular classes of mixed states of N qubits, and computable lower bounds to global, partial, or genuine multiparticle entanglement of any general state. For global and partial entanglement, useful bounds are obtained with minimum effort, requiring local measurements in just three settings for any N. For genuine entanglement, a number of measurements scaling linearly with N are required. We demonstrate the power of our approach to estimate and quantify different types of multiparticle entanglement in a variety of N-qubit states useful for uantum information processing and recently engineered in laboratories with quantum optics and trapped ion setups.


Cianciaruso, M., Bromley, T. R., & Adesso, G. (2016). Accessible quantification of multiparticle entanglement. npj Quantum Information, 2(1), Article 16030.

Journal Article Type Article
Acceptance Date Aug 28, 2016
Online Publication Date Oct 18, 2016
Publication Date Oct 18, 2016
Deposit Date Feb 24, 2017
Publicly Available Date Feb 24, 2017
Journal npj Quantum Information
Electronic ISSN 2056-6387
Publisher Nature Publishing Group
Peer Reviewed Peer Reviewed
Volume 2
Issue 1
Article Number 16030
Keywords Quantum Physics; Statistical Mechanics; High Energy Physics - Theory; Mathematical Physics; Optics
Public URL
Publisher URL
Related Public URLs


16NPJ_2_1630.pdf (1.2 Mb)

Copyright Statement
Copyright information regarding this work can be found at the following address:

You might also like

Downloadable Citations