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Many-particle entanglement on atom chips

Applicant Treutlein Philipp
Number 149901
Funding scheme Project funding (Div. I-III)
Research institution Departement Physik Universität Basel
Institution of higher education University of Basel - BS
Main discipline Other disciplines of Physics
Start/End 01.10.2013 - 30.09.2016
Approved amount 741'820.00
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Keywords (7)

entanglement; Bose-Einstein condensation; quantum metrology; quantum state tomography; phase coherence; atom chips; ultracold atoms

Lay Summary (German)

Lead
Die quantenmechanische Verschränkung ist eines der faszinierendsten und herausforderndsten Konzepte der Physik. Neben ihrer Bedeutung für unser wissenschaftliches Weltbild ist sie die Grundlage für eine neue Generation von Quantentechnologien wie beispielsweise die Quanteninformationsverarbeitung und die Quantenmetrologie. Während Verschränkung von zwei Teilchen vergleichsweise gut verstanden ist, gibt es noch viele offene Fragen zur Verschränkung in Vielteilchensystemen und deren Anwendungen.
Lay summary

Inhalt und Ziel des Forschungsprojekts

Ziel dieses Projekts ist die Erzeugung und Untersuchung von Vielteilchenverschränkung in atomaren Bose-Einstein-Kondensaten auf einem Atomchip. Bose-Einstein-Kondensate aus ultrakalten Atomen sind ein ausserordentlich gut kontrollierbares quantenmechanisches Vielteilchensystem. Atomchips stellen ein Quantenlabor auf einem Mikrochip dar, mit dessen Hilfe sich Atome gezielt verschränken und untersuchen lassen. Mit diesem System werden wir einerseits fundamentale Fragen zur Vielteilchenverschränkung untersuchen und andererseits Anwendungen in der Quantentechnologie erforschen. Eine damit verwandte Fragestellung, die ebenfalls untersucht werden soll, betrifft die fundamentalen Grenzen der Phasenkohärenz von Bose-Einstein-Kondensaten.

Wissenschaftlicher und gesellschaftlicher Kontext des Forschungsprojekts

Die Konzepte und Technologien die in diesem Projekt untersucht werden sind für die Entwicklung der Quantentechnologie relevant. Mögliche Anwendungen sind insbesondere kompakte Atomuhren, die mit verschränkten Atomen arbeiten, sowie Atominterferometer für die präzise Vermessung von elektromagnetischen Feldern, der Gravitation und anderer fundamentaler Grössen.

 

Direct link to Lay Summary Last update: 03.10.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
Bell correlations in a Bose-Einstein condensate
Schmied Roman, Bancal Jean-Daniel, Allard Baptiste, Fadel Matteo, Scarani Valerio, Treutlein Philipp, Sangouard Nicolas (2016), Bell correlations in a Bose-Einstein condensate, in Science, 352, 441.
Frequency-tunable microwave field detection in an atomic vapor cell
Horsley Andrew, Treutlein Philipp (2016), Frequency-tunable microwave field detection in an atomic vapor cell, in Applied Physics Letters, 108, 211102.
Quantum state tomography of a single qubit: comparison of methods
Schmied Roman (2016), Quantum state tomography of a single qubit: comparison of methods, in Journal of Modern Optics, 63, 1744.
Sideband Rabi spectroscopy of finite-temperature trapped Bose gases
Allard Baptiste, Fadel Matteo, Schmied Roman, Treutlein Philipp (2016), Sideband Rabi spectroscopy of finite-temperature trapped Bose gases, in Physical Review A, 93, 043624.
Imaging Microwave and DC Magnetic Fields in a Vapor-Cell Rb Atomic Clock
Affolderbach Christoph, Du Guan-Xiang, Bandi Thejesh, Horsley Andrew, Treutlein Philipp, Mileti Gaetano (2015), Imaging Microwave and DC Magnetic Fields in a Vapor-Cell Rb Atomic Clock, in IEEE Transactions on Instrumentation and Measurement, 64(12), 3629-3629.
Widefield microwave imaging in alkali vapor cells with sub-100 $μ$m resolution
Horsley Andrew, Du Guan-Xiang, Treutlein Philipp (2015), Widefield microwave imaging in alkali vapor cells with sub-100 $μ$m resolution, in New Journal of Physics, 17, 112002.

Collaboration

Group / person Country
Types of collaboration
Prof. Dr. Valerio Scarani / National University of Singapore Singapore (Asia)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Prof. Dr. Stefan Willitsch / University of Basel Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Research Infrastructure
- Exchange of personnel
Prof. Dr. Nicolas Sangouard / University of Basel Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Exchange of personnel
Prof. Dr. Alice Sinatra / ENS Paris France (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Exchange of personnel
Prof. Dr. Gaetano Mileti, University of Neuchatel Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Exchange of personnel
Prof. Dr. Johann W. Blatter / ETH Zürich Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
12th European Conference on Atoms Molecules and Photons (ECAMP) Talk given at a conference Bell correlations in a Bose-Einstein condensate 05.09.2016 Frankfurt, Germany Treutlein Philipp;
QCMC 2016 – 13th Intl. Conference on Quantum Communication, Measurement and Computing Talk given at a conference Bell correlations in a Bose-Einstein condensate 06.07.2016 Singapur, Singapore Schmied Roman;
International Conference on the Frontiers in Atomic, Molecular, and Optical Physics Talk given at a conference Detection of Bell correlations in a spin-squeezed Bose-Einstein condensate 23.05.2016 Shanghai, China Fadel Matteo;
Department seminar Individual talk Bell correlations in a Bose-Einstein condensate 11.03.2016 Stanford University, United States of America Treutlein Philipp;
Recent Advances in Quantum Metrology Talk given at a conference Bell correlations in a Bose-Einstein condensate 02.02.2016 Warszawa, Poland Treutlein Philipp;
AMOP colloquium Individual talk Bell correlations in a Bose-Einstein condensate 18.01.2016 Cambridge University, Great Britain and Northern Ireland Treutlein Philipp;
Winter Colloquium on the Physics of Quantum Electronics Talk given at a conference Non-Locality in a Bose-Einstein condensate 05.01.2016 Snowbird, United States of America Schmied Roman;
Workshop on Quantum Nonlocality, Causal Structures and Device-independent Quantum Information Talk given at a conference Bell Correlations in a Bose-Einstein condensate 12.12.2015 National Cheng Kung University, Taiwan Schmied Roman;
602. WE-Heraeus-Seminar Microwaves Go Quantum Talk given at a conference Bell correlations and quantum metrology on a microwave atom chip 18.11.2015 Bad Honnef, Germany Treutlein Philipp;
22nd Central European Workshop on Quantum Optics Talk given at a conference Nonlocality in a Bose-Einstein condensate 10.07.2015 Warszawa, Poland Treutlein Philipp;
International Conference on Quantum Systems and Technology Talk given at a conference Nonlocality in a Bose-Einstein condensate 09.06.2015 Monte Verita, Switzerland Treutlein Philipp;
589. Heraeus seminar on Continuous Variable Entanglement in Atomic Systems Talk given at a conference Nonlocality in a Bose-Einstein condensate 12.05.2015 Bad Honnef, Germany Schmied Roman;
576th Heraeus-Seminar on Designed Quantum States of Matter Talk given at a conference Quantum metrology and entanglement on an atom chip 05.12.2014 Bad Honnef, Germany Treutlein Philipp;
Frontiers of Matter Wave Optics Talk given at a conference Quantum metrology with Bose-Einstein condensates on an atom chip 08.10.2014 Kreta, Greece Treutlein Philipp;


Self-organised

Title Date Place

Communication with the public

Communication Title Media Place Year
Talks/events/exhibitions Münstergymnasium Basel: Die Grenzen der Messbarkeit. Der Zufall in der Quantenphysik German-speaking Switzerland 2016
Talks/events/exhibitions Novartis Science Day: Quantum randomness and the world’s best clocks German-speaking Switzerland 2016
Talks/events/exhibitions Quanten- und Nanowelten Gelterkinden: Die Grenzen der Messbarkeit. Der Zufall in der Quantenphysik German-speaking Switzerland 2016
Media relations: print media, online media Quantenkollektiv in ungekannter Größe Spektrum.de International 2016
Talks/events/exhibitions Saturday Morning Physics: Die Grenzen der Messbarkeit. Der Zufall in der Quantenphysik German-speaking Switzerland 2016
Media relations: print media, online media Spukhafte Vielwirkung pro-physik.de International 2016
Talks/events/exhibitions Ringvorlesung zum internationalen Jahr des Lichts: Licht als Werkzeug German-speaking Switzerland 2015
Talks/events/exhibitions Samstagsuniversität Basel: Was ist Licht? Erkenntnisse der Quantenphysik. German-speaking Switzerland 2015
Talks/events/exhibitions Hochrhein Seminar Waldshut: Ultrakalte Atome – die kälteste Materie der Welt International 2014
Talks/events/exhibitions Seniorenuniversität Basel: Ultrakalte Atome – die kälteste Materie der Welt German-speaking Switzerland 2013

Awards

Title Year
Best poster prize at the 28th European Frequency and Time Forum 2014
Best poster prize at the Australian Institute of Physics Congress 2014

Associated projects

Number Title Start Funding scheme
132519 Entanglement on Atom Chips 01.10.2010 Project funding (Div. I-III)
169591 Bell correlations in Bose-Einstein condensates 01.10.2016 Project funding (Div. I-III)
157770 Basel Shared Frequency Comb Facility 01.12.2014 R'EQUIP

Abstract

Entanglement is one of the most fascinating and at the same time puzzling concepts of physics. Besides being of fundamental interest, it is at the heart of quantum technologies such as quantum information processing and quantum metrology, which are expected to have a strong impact on our future way of computing and measuring. While entanglement of two particles is a relatively well-studied concept, entanglement in many-body systems is much less understood. Many different classes of entangled states exist and it is important to investigate which classes offer advantages in performing a given technological task, such as a high-precision measurement. In this project, we use small atomic Bose-Einstein condensates on an atom chip - an exceptionally well-controlled quantum many-body system - to perform fundamental studies of many-particle entangled states and to explore their usefulness for quantum technology. Moreover, we will investigate the fundamental limits of phase coherence in atomic Bose-Einstein condensates and study the implications of these limits. The concepts and technologies investigated in this project are relevant for compact atomic clocks and atom interferometers measuring electromagnetic fields, gravity, and other fundamental quantities.
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