Optical systems are the most suitable physical systems for transmitting quantum information over large distance. What is more, recent years have seen a remarkable progress in the understanding of performing precise quantum state manipulation of optical systems, both in the discrete variable setting involving polarization or time-bin encoding as well as so-called continuous variables. We are concerned with understanding what quantum state manipulation is possible after all, often in close collaboration with leading experimentalists.
Selected group publications
Reliable quantum certification for photonic quantum technologies
Nature Communications 6, 8498 (2015)
Experimental implementation of the optimal linear-optical controlled phase gate
Physical Review Letters 106, 013602 (2011)
Directly estimating non-classicality
Physical Review Letters 106, 010403 (2011)
Photonic polarization gears for ultra-sensitive angular measurements
Nature Communications 4, 2432 (2013)
Optical generation of matter qubit graph states
New Journal of Physics 7, 194 (2005)
Optimizing linear optics quantum gates
Physical Review Letters 95, 040502 (2005)
Measuring measurement
Nature Physics 5, 27 (2009)
Distillation of continuous-variable entanglement with optical means
Annals of Physics (NY) 311, 431 (2004)
Driving non-Gaussian to Gaussian states with linear optics
Physical Review A 67, 062320 (2003)
The entangling power of passive optical elements
Physical Review Letters 90, 047904 (2003)
Gaussification and entanglement distillation of continuous variable systems: a unifying picture
Physical Review Letters 108, 020501 (2012)
Group reviews