Post:	Marie Curie Excellence Grant Team Leader
Location:	Pevensey 2 3A8
Email:	W.Lange@sussex.ac.uk
Telephone numbers
Internal:	3171
UK:	(01273) 873171
International:	+44 1273 873171

Biography

Education

• Physics Diploma, Technische Universität München, 1988
• PhD in Physics (Coherently excited Rydberg atoms in a cavity-modified vacuum-field), Ludwig-Maximilians-Universität München, 1994
• Habilitation (Single atoms and ions in quantized fields), Ludwig-Maximilians-Universität München, 2003

Positions

• 1988-1994   Research Assistant, Ludwig-Maximilians-Universität München
• 1994-1996   Research Fellow, California Institute of Technology
• 1996-2004   Research Scientist, Max-Planck-Institut für Quantenoptik
• 2003-2004   Lecturer, Ludwig-Maximilians-Universität München
• since 2004   Professor, University of Sussex

Role

• Professor of Atomic, Molecular and Optical Physics
• Marie Curie Excellence Team Leader
• Head of the Atomic, Molecular and Optical Physics group

Research

 

Single Ion Cavity-QED

 

Miniature ion traps are an ideal tool for storing and manipulating single atomic particles. Combined with laser cooling, we can control the ions' position on the nanometer scale. The light field in our experiments is also confined, using two mirrors with ultra-high reflectivity forming an optical cavity. With this setup, the coupling between ions and photons is hugely enhanced, giving us unprecedented control over the light-matter interaction. We can induce an ion to emit precisely one single photon at an exactly specified time and even cast it to an arbitrary temporal shape. Such a single-photon source is an important building block in schemes for efficient quantum information processing. The goal of our research is to implement large scale quantum networks in which ion-based quantum information is distributed by single photons. This may one day lead to a quantum version of the internet.

Here are a few of the subjects we investigate in the laboratory: 

• Quantum-interface between ion and photon quantum bits
• Ion-photon and photon-mediated ion-ion entanglement
• Probabilistic entanglement of ions coupled to a cavity
• Cluster-state generation in long ion chains
• Microscopic and integrated ion-cavity designs

Teaching

Presently taught courses: 

• M-Level: Atom-Light Interactions (F3150)

Formerly taught courses:

• M-Level: Atomic Structure and Angular Momentum (F3113)
• Level 3: MPhys Advanced Experimental Laboratory
• Level 3: Introduction to C
• Level 2: Year 2 Physics Laboratory
• Level 1: Oscillations and Waves

Selected publications

2007

Stable long-term coupling of a single ion to a cavity mode (with Matthias Keller, Lange, B, Hayasaka, K and Walther, H) in Journal of Modern Optics

2005

Long-term stability of continuous-wave emission from an ion-cavity system (with Matthias Keller, Lange, B, Hayasaka, K and Walther, H) in European Physical Journal D Volume 32 pp. 161-166

2004

A calcium ion in a cavity as a controlled single-photon source (with Matthias Keller, Lange, B, Hayasaka, K and Walther, H) in New Journal of Physics Volume 6 pp. 95-116

Continuous generation of single photons with controlled waveform in an ion-trap cavity system (with Matthias Keller, Lange, B, Hayasaka, K and Walther, H) in Nature Volume 431 pp. 1075-1078

Deterministic coupling of single ions to an optical cavity (with Lange, B, Hayaska, K and Walther, H) in Applied Physics B Volume 76 pp. 125-128

2003

Deterministic cavity quantum electrodynamics with trapped ions (with Matthias Keller, Lange, B, Hayasaka, K and Walther, H) in Journal of Physics B Volume 36 pp. 613-622

2001

A single ion as a nanoscopic probe of an optical field (with Matthias Keller, Guthöhrlein, G R, Hayasaka, K and Walther, H) in Nature Volume 414 pp. 49-51

Raman sideband cooling in the presence of multiple decay channels (with Morigi, G, Baldauf, H and Walther, H) in Optics Communications Volume 187 pp. 171-177