Project

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Entanglement on Atom Chips

Applicant Treutlein Philipp
Number 132519
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 01.10.2010 - 30.09.2013
Approved amount 779'367.00
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Keywords (11)

ultracold atoms; atom chips; entanglement; quantum metrology; quantum information processing; Bose-Einstein condensation; quantum coherence; atomic clock; quantum computing; quantum simulation; spin-squeezing

Lay Summary (English)

Lead
Lay summary
Entanglement is one of the most fascinating concepts of physics. It lies at the very heart of quantum physics and still poses many puzzling questions to scientists and philosophers alike. Recently it has been realized that entanglement is a resource that could revolutionize our way of computing, measuring, and communicating. In particular, entangled states of ultracold atomic ensembles could allow one to improve the precision of atomic clocks and interferometers.In this project, we investigate entanglement with ultracold atoms on an atom chip. We focus both on the fundamental physics of entangled states of the atoms as well as on potential applications in chip-based atomic clocks or quantum computers. On an atom chip, ultracold atoms are trapped by electromagnetic fields from microfabricated wires and electrodes. Atom chips thus provide a compact, robust and scalable technological platform for experiments with ultracold atoms. A robust scheme for generating and manipulating entanglement on atom chips could thus lead to the development of portable atomic clocks and interferometric sensors that employ entanglement to enhance measurement precision.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
Imaging of Relaxation Times and Microwave Field Strength in a Microfabricated Vapor Cell
Horsley Andrew, Du Guan-Xiang, Pellaton Matthieu, Affolderbach Christoph, Mileti Gaetano, Treutlein Philipp (2013), Imaging of Relaxation Times and Microwave Field Strength in a Microfabricated Vapor Cell, in Phys. Rev. A, 88, 063407.
Quantum Metrology with a Scanning Probe Atom Interferometer
Ockeloen Caspar F., Schmied Roman, Riedel Max F., Treutlein Philipp (2013), Quantum Metrology with a Scanning Probe Atom Interferometer, in Phys. Rev. Lett., 111, 143001-143001.
Spin squeezing and Einstein-Podolsky-Rosen entanglement of two bimodal condensates in state-dependent potentials
Kurkjian Hadrien, Pawłowski Krzysztof, Sinatra Alice, Treutlein Philipp (2013), Spin squeezing and Einstein-Podolsky-Rosen entanglement of two bimodal condensates in state-dependent potentials, in Phys. Rev. A, 88(4), 043605-043605.
Simple microwave field imaging technique using hot atomic vapor cells
Böhi Pascal, Treutlein Philipp (2012), Simple microwave field imaging technique using hot atomic vapor cells, in Appl. Phys. Lett., 101, 181107-181107-4.
Atom Chip Fabrication
Folman Ron, Treutlein Philipp, Schmiedmayer Jörg (2011), Atom Chip Fabrication, in Reichel Jakob and Vuletic Vladan (ed.), Wiley-VCH, Weinheim, Germany, 61-117.
Cold atoms image microwave fields
Böhi Pascal, Riedel Max F., Treutlein Philipp (2011), Cold atoms image microwave fields, in SPS Communications, 33, 10-12.
Quantum computing implementations with neutral particles
Negretti Antonio, Treutlein Philipp, Calarco Tommaso (2011), Quantum computing implementations with neutral particles, in Quantum Information Processing, 10, 721-753.
Quantum Information Processing with Atom Chips
Treutlein Philipp, Negretti Antonio, Calarco Tommaso (2011), Quantum Information Processing with Atom Chips, in Reichel Jakob and Vuletic Vladan (ed.), Wiley-VCH, Weinheim, Germany, 283-308.
Tomographic reconstruction of the Wigner function on the Bloch sphere
Schmied Roman, Treutlein Philipp (2011), Tomographic reconstruction of the Wigner function on the Bloch sphere, in New Journal of Physics, 13, 065019-18pp.

Collaboration

Group / person Country
Types of collaboration
Université de Neuchâtel Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
University of Trento Italy (Europe)
- in-depth/constructive exchanges on approaches, methods or results
ENS Paris France (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
MPQ/LMU München Germany (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
Conference on Fundamentals and Applications of Ultra-cold Matter Talk given at a conference Quantum Metrology and Entanglement on Atom Chips 16.09.2013 Hannover, Germany Treutlein Philipp;
QIPC 2013, International Conference on Quantum Information Processing and Communication Talk given at a conference Quantum metrology with a scanning probe atom interferometer 30.06.2013 Firenze, Italy Ockeloen Caspar Frederik;
IonTech: Techniques for Trapped Ions 2012 Talk given at a conference Generation, control, guiding and imaging of microwaves 08.05.2012 Siegen, Germany Treutlein Philipp;
QIPC 2011, International Conference on Quantum Information Processing and Communication Talk given at a conference Quantum metrology with ultracold atoms on a chip 08.09.2011 Zürich, Switzerland Treutlein Philipp; Ockeloen Caspar Frederik; Riedel Max;
ICOLS 2011 International Conference on Laser Spectroscopy student workshop Talk given at a conference Atom-chip-based generation of entanglement for quantum metrology 08.06.2011 Hannover, Germany Treutlein Philipp;
Quantum Science and Technologies Conference Talk given at a conference Quantum metrology with ultracold atoms on a chip 10.05.2011 Rovereto, Italy Ockeloen Caspar Frederik; Treutlein Philipp;
Symposium on Quantum Dynamics of Ultracold Atoms Talk given at a conference Atom-chip-based generation of entanglement for quantum metrology 09.12.2010 Guangzhou, China, China Treutlein Philipp;


Self-organised

Title Date Place
Workshop on "Atom Chips" 22.06.2011 Basel, Switzerland

Communication with the public

Communication Title Media Place Year
Talks/events/exhibitions Café Scientifique: Quantencomputer German-speaking Switzerland 2011
Media relations: print media, online media Ideen für neue Sensoren Chemie Plus 3/2011 German-speaking Switzerland 2011
Talks/events/exhibitions Saturday Morning Physics: Ultrakalte Atome - die kälteste Materie des Universums German-speaking Switzerland 2011
Talks/events/exhibitions Vorträge in Schulen: Ultrakalte Atome - die kälteste Materie des Universums German-speaking Switzerland 2011

Associated projects

Number Title Start Funding scheme
149901 Many-particle entanglement on atom chips 01.10.2013 Project funding (Div. I-III)
144979 Mode-locked laser for fast quantum state manipulation 01.01.2013 R'EQUIP

Abstract

Entanglement-based technologies, such as quantum information processing, quantum simulations, and quantum metrology, have the potential to revolutionize our way of computing and measuring, and help to clarify the puzzling concept of entanglement itself. Ultracold atoms on atom chips are an attractive system for their implementation, as they provide control over quantum systems in compact, robust, and scalable setups. This proposal consists of three projects investigating entanglement on atom chips, focusing on both fundamental physics and possible applications: The study of multi-particle entanglement for quantum metrology, the development of novel techniques for chip-based quantum state control, and the realization of a two-qubit quantum gate.Research on multi-particle entanglement for quantum metrology (project A) currently receives great interest. Such entanglement, e.g. in the form of spin-squeezed states, provides a way to overcome the standard quantum limit of interferometric measurement, which is reached in today's best atomic clocks. We propose to study multi-particle entanglement in an ensemble of ultracold atoms, using a technique that is entirely chip-based and relies on collisions in a state-dependent potential. We will thoroughly study this technique and explore its usefulness for chip-based atomic clocks operating beyond the standard quantum limit. The nature of entanglement between indistinguishable particles, such as the atoms in a Bose-Einstein condensate, is much less understood than entanglement between individually addressable particles. We propose to study measures of entanglement which allow to better identify and quantify such entanglement and understand its relation to indistinguishability. Sophisticated techniques for quantum state control on atom chips (project B) are essential for the generation and manipulation of entanglement. We propose to further develop such techniques based on microwave near-fields on atom chips. We intend to perform a full characterization of microwave near-field potentials, to use microwave near-fields for coherent manipulation of vibrational qubits, and to develop techniques for the addressing and independent coherent manipulation of multiple ensembles of atoms on the same chip. The demonstration of a fundamental two-qubit quantum gate (project C) is an important milestone on the way to atom chip based quantum computing. In a first step, we propose to entangle two small ensembles of ultracold atoms using the techniques developed in project B. In a second step, which will be carried out in collaboration with the group of Prof. Jakob Reichel in Paris, we intend to realize a quantum gate between two individual atoms on an atom chip. The main applicant, Prof. Dr. Philipp Treutlein, is a young assistant professor in the Department of Physics at the University of Basel. He is currently designing a new ultracold atom laboratory, which will be completed in fall 2010. He has 10 years of experience in ultracold atom experiments, obtained in some of the world-leading laboratories at Stanford, Konstanz, and Munich. His expertise in atom chips comes from 7 years at MPQ and LMU Munich, where he was first a doctoral student with Dr. Jakob Reichel and Prof. Theodor W. Hänsch and later became the leader of the atom chip experiments. In Basel, we propose to set up an experiment that is unique in Switzerland, and with our Swiss and international collaborators we form a competitive team to investigate entanglement for chip-based quantum technologies.
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