The Integrated Quantum Optics group sent a large contingent to this year’s DPG spring meeting of the Atomic, Molecular, Plasma Physics and Quantum Optics Section (SAMOP) in Mainz. Eight PhD students, five Master students, one postdoc, and one junior professor attended.
Prof. Dr. Christine Silberhorn konnten kürzlich erstmals Bandbreitenkompression für Einzelphotonen mit hocheffizienter Frequenzkonversion kombinieren. Die Versuchsanordnung basiert auf nichtlinearen Wellenleitern in Lithiumniobat, die die Gruppe selbst in Paderbornb herstellt. Die spektralen Eigenschaften von Einzelphotonenquellen im Telecom-Band können damit besser als zuvor an die von atomaren Systemen im sichtbaren und nah-infraroten…
Direct probing scheme. Two-mode squeezed states are generated with the process of parametric down-conversion. One of the two modes is overlapped with a reference beam at a beam splitter. Both modes are then measured with photon-number detectors. From their statistics, the amplitude correlations and hence the squeezing can be inferred.
The characterization of quantum states is an essential part of quantum optics. One particular task is the estimation of squeezing in so called two-mode squeezed states.
In a recent publication in Physical Review Letters*, researchers from the integrated quantum optics group in Paderborn in collaboration with theoretical physicists from Olomouc in the Czech Republic and Madrid in Spain have demonstrated a method to measure such squeezing in a…
Response curves of the TES detector. Each of the 500 shown traces is a raw detection event. The traces already indicate the discretization of energy levels, i.e. the photon number of each input pulse. With further post processing of these traces, photon numbers up to 20 can be detected with single-photon resolution and up to 100 with a few-photon resolution.
The generation of macroscopic quantum states is a challenging goal throughout many fields of physics. Not only would it be fascinating to see quantum effects on a macroscopic scale, their generation is also a prerequisite if one wants to exploit quantum effects for real-world applications.
In a joint publication, recently published in Physical Review Letters*, scientists from two groups at the University of Paderborn, the IQO and the MQO, in…
