Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Viewpoint: Squeezing Out More Information About Entanglement

Otfried Gühne, Tobias Moroder

Published Jul 15, 2013• 0 citations
OpenAlex

Abstract

An experimental demonstration of a novel quantum analysis tool will allow diagnosis of entanglement in a much broader set of states.

Related papers

Squeezing Out More Information About Entanglement

Otfried Gühne, Tobias Moroder

An experimental demonstration of a novel quantum analysis tool will allow diagnosis of entanglement in a much broader set of states.

Physics•Jul 15, 2013•0 citations

Efficient non-tomographic tools for the characterization of multipartite entanglement

Witlef Wieczorek, Nikolai Kiesel, Christoph Schmid +1 more

Entanglement is the crucial resource in the field of quantum information processing and consequently a better understanding of its properties is very desirable. While for bipartite entangled qubit states many tools for characterization exist and also the experimental implementation of the tools is feasible, the situation for multipartite entangled states is different: The available tools have to be suited for a much greater diversity of entanglement properties, e.g. to analyze all the different entanglement classes [1]. A full experimental characterization via state tomography is increasingly difficult as the number of necessary measurement settings grows exponentially with the number of particles. In this contribution we focus on efficient, non-tomographic methods to characterize experimentally observed, multipartite entangled states. First steps towards this goal were demonstrated recently, for instance, for the proof of genuine multipartite entanglement [2] or for the analysis of the persistency of entanglement under loss [3]. Such methods can be further optimized by tailoring them to particular properties of states. We show how three important characteristic quantities, the fidelity, the non-separability and the permutation symmetry, can be evaluated with a significantly lower number of measurement settings than required for a complete tomography. Although the determination of these particular properties provides less information than the reconstruction of the complete density matrix, it allows to judge how well state characteristics are reproduced experimentally. This might be important with respect to an experimental application of states in quantum information. Exemplarily we apply the analysis tools to two genuinely four-qubit entangled states: the Dicke state with two excitations |D 4 〉 [4] and the cluster state |C4 〉 [5, 6]. These states are relevant for particular tasks: The state |D 4 〉 is a resource for telecloning [7], cluster states find an application in one-way quantum computation [6, 8] and are a subgroup of graph states, which play an important role for quantum error correction.

•Jan 1, 2007•0 citations

Verifying Entanglement with Limited Data

Ryan Wilkinson

A new technique efficiently detects quantum entanglement using just a small set of measurements.

Physics•Apr 29, 2026•0 citations

How Can One Measure Quantum Entanglement

Prashanna Simkhada, Jean-François S. Van Huele

Bulletin of the American Physical Society•Oct 22, 2011•0 citations

基于非线性量子纠缠的拓扑结构分析

Jincheng Zhang

This paper investigates the application of non-linear quantum entanglement to improve the efficiency and accuracy of topological structure analysis. Traditional methods often struggle with complex systems, while our framework offers a fundamentally new approach leveraging the unique properties of entangled quantum states to enhance analysis. We explore a novel methodology utilizing entangled qubit states to uncover subtle topological features within data sets, ultimately providing a more robust and insightful tool for modeling complex systems. The core claim centers on the potential to significantly accelerate and refine topological structure analysis through the integration of quantum entanglement. This work presents a theoretical framework and preliminary experimental demonstrations focusing on the analysis of graph networks, demonstrating promising results in identifying critical topological structures. The paper concludes with a discussion of future research directions and the potential impact of this approach on various fields.

•Aug 31, 2026•0 citations

Verifying cross-Kerr induced number squeezing: a case study

David Schmid, Kevin Marshall, Daniel F. V. James

We analyse an experimental method for creating interesting nonclassical states by processing the entanglement generated when two large coherent states interact in a cross-Kerr medium. We specifically investigate the effects of loss and noise in every mode of the experiment, as well as the effect of ‘binning’ the post-selection outcomes. Even with these imperfections, we find an optimal set of currently achievable parameters which would allow a proof-of-principle demonstration of number squeezing in states with large mean photon number. We discuss other useful states which can be generated with the same experimental tools, including a class of states which contain coherent superpositions of differing photon numbers, e.g. good approximations to the state 12(|0⟩+|20⟩). Finally, we suggest one possible application of this state in the field of optomechanics.

arXiv:1706.03136•Journal of Modern Optics•Aug 4, 2017•4 citations
Entanglement is the crucial resource in the field of quantum information processing and consequently a better understanding of its properties is very desirable. While for bipartite entangled qubit states many tools for characterization exist and also the experimental implementation of the tools is feasible, the situation for multipartite entangled states is different: The available tools have to be suited for a much greater diversity of entanglement properties, e.g. to analyze all the different entanglement classes [1]. A full experimental characterization via state tomography is increasingly difficult as the number of necessary measurement settings grows exponentially with the number of particles. In this contribution we focus on efficient, non-tomographic methods to characterize experimentally observed, multipartite entangled states. First steps towards this goal were demonstrated recently, for instance, for the proof of genuine multipartite entanglement [2] or for the analysis of the persistency of entanglement under loss [3]. Such methods can be further optimized by tailoring them to particular properties of states. We show how three important characteristic quantities, the fidelity, the non-separability and the permutation symmetry, can be evaluated with a significantly lower number of measurement settings than required for a complete tomography. Although the determination of these particular properties provides less information than the reconstruction of the complete density matrix, it allows to judge how well state characteristics are reproduced experimentally. This might be important with respect to an experimental application of states in quantum information. Exemplarily we apply the analysis tools to two genuinely four-qubit entangled states: the Dicke state with two excitations |D 4 〉 [4] and the cluster state |C4 〉 [5, 6]. These states are relevant for particular tasks: The state |D 4 〉 is a resource for telecloning [7], cluster states find an application in one-way quantum computation [6, 8] and are a subgroup of graph states, which play an important role for quantum error correction.
This paper investigates the application of non-linear quantum entanglement to improve the efficiency and accuracy of topological structure analysis. Traditional methods often struggle with complex systems, while our framework offers a fundamentally new approach leveraging the unique properties of entangled quantum states to enhance analysis. We explore a novel methodology utilizing entangled qubit states to uncover subtle topological features within data sets, ultimately providing a more robust and insightful tool for modeling complex systems. The core claim centers on the potential to significantly accelerate and refine topological structure analysis through the integration of quantum entanglement. This work presents a theoretical framework and preliminary experimental demonstrations focusing on the analysis of graph networks, demonstrating promising results in identifying critical topological structures. The paper concludes with a discussion of future research directions and the potential impact of this approach on various fields.
We analyse an experimental method for creating interesting nonclassical states by processing the entanglement generated when two large coherent states interact in a cross-Kerr medium. We specifically investigate the effects of loss and noise in every mode of the experiment, as well as the effect of ‘binning’ the post-selection outcomes. Even with these imperfections, we find an optimal set of currently achievable parameters which would allow a proof-of-principle demonstration of number squeezing in states with large mean photon number. We discuss other useful states which can be generated with the same experimental tools, including a class of states which contain coherent superpositions of differing photon numbers, e.g. good approximations to the state 12(|0⟩+|20⟩). Finally, we suggest one possible application of this state in the field of optomechanics.