physics
recent research
Continuousvariable qubit states
Please have a go with my cv qubit space flight simulator! It is science, it is fun  what can you lose?
Using a squeezed vacuum source and an advanced photon subtraction technique, we succeeded in generating a large range of different superpositions of squeezed vacuum and squeezed singlephoton states. These states can be interpreted as qubits with continuousvariable basis states.
The following animation illustrates this qubit space as a Bloch sphere. Each experimentally obtained state is represented by its Wigner function at the location on the Bloch sphere corresponding to its superposition parameters.
I have also developed an interactive applet that allows you to move around in the qubit space and investigate each state in detail. Go to the cv qubit applet here.
academic history
Full CV for download 1999–2003
 Bachelor studies in physics and mathematics at University of Copenhagen.
 2003–2005
 Master studies in physics. My thesis work was carried out in the Quantop group at the Niels Bohr Institute, University of Copenhagen.
 2005–2008
 PhD studies in experimental quantum optics at Quantop under the supervision of Prof. Eugene Polzik.
 March–May 2006
 Research exchange student in the Furusawa laboratory at the University of Tokyo.
 October 2008–September 2011
 Limited term researcher (post doc) in the Quantum ICT Group at NICT (National Institute of Information and Communications Technology) in Koganei, Tokyo.
 September 2011–
 Post doc in the Quantum Information Group at DTU (Technical University of Denmark) in Lyngby, Denmark.
My theses for download
 Master thesis
 Nonclassical light source for quantum networks [ pdf, 3.4 MB ]
 PhD thesis
 Generation of single photons and Schrödinger kitten states of light
[ DOI:10.6074/m9.figshare.1328405  pdf, 11.2 MB ]
publications
Journal articles

Increasing the photon collection rate from a single NV center with a silver mirror

Assessments of macroscopicity for quantum optical states

Heralded generation of a micromacro entangled state

Quantum teleamplification with a continuousvariable superposition state

Amplification of realistic Schrödingercatstatelike states by homodyne heralding

Displacementenhanced entanglement distillation of singlemodesqueezed entangled states

Breakdown of the classical description of a local system

Photon subtraction from traveling fields  recent experimental demonstrations
 pdf ©NII

Engineering of optical continuousvariable qubits via displaced photon subtraction: multimode analysis
 pdf ©T&F

Optical continuousvariable qubit

Entanglement distillation from Gaussian input states

Time gating of heralded single photons for atomic memoriesDiscussed in Editor's Choice in Science 327 no. 5963.

High purity bright single photon source

Timegated EinsteinPodolskyRosen correlation

Generation of a superposition of odd photon number states for quantum information networks
In conference proceedings, etc.

Continuous variable qubit state engineering
 pdf ©AIP

Quantum interface between light and atomic ensemblesLaser Spectroscopy. Proceedings of the XVIII ICOLS 2007, Eds. L. Hollberg, J. Bergquist, M. Kasevich, World Scientific (2008)

Narrow bandwidth optical Schrödinger kitten states and single photonsProceedings of the 8th International Conference on QCMC 2006, Eds. O. Hirota, J. H. Shapiro, and M. Sasaki (2007)
Other articles

Two become oneNews & Views article covering the paper Joining the quantum state of two photons into one by Vitelli et al.

Bridging discrete and continuous variables in quantum informationOptics in 2010 special issue that "highlights the most exciting peerreviewed optics research to have emerged over the past 12 months," with our figure on the front cover and with a link to the interactive applet we made to illustrate the experiment and data.