ForschungTopical Groups
Non-classical Light

Non-classical Light


Generation of squeezed states of light tailored for the application in

  • Gravitational wave detectors
  • Sub-standard quantum limit interferometry
  • Quantum information
  • Measurement induced entanglement / entanglement swapping
  • Quantum teleportation
  • High-precision spectroscopy

Investigation of decoherence effects to go beyond the current limits.


  • Squeezed light generation at 1064nm and 1550nm
  • High bandwidth / low noise homodyne detection


Junker J, Wilken D, Huntington E, Heurs M. High-precision cavity spectroscopy using high-frequency squeezed light. Optics express. 2021 Feb 10;29(4):6053-6068. doi.org/10.1364/OE.416713

Lough JD, Schreiber E, Bergamin F, Grote H, Mehmet M, Vahlbruch H et al. First Demonstration of 6 dB Quantum Noise Reduction in a Kilometer Scale Gravitational Wave Observatory. Physical review letters. 2021 Jan 26;126(4). 041102. doi.org/10.1103/PhysRevLett.126.041102

Heinze J, Vahlbruch H, Willke B. Frequency-doubling of continuous laser light in Laguerre–Gaussian modes LG0,0 and LG3,3. Optics letters. 2020 Sep 15;45(18):5262-5265. doi.org/10.1364/OL.402371, doi.org/10.1364/OL.410805

Heinze J, Vahlbruch H, Willke B. Numerical analysis of LG3,3second harmonic generation in comparison to the LG0,0case. Optics express. 2020 Nov 10;28(24):35816-35832. doi.org/10.1364/OE.409507

Mehmet M, Vahlbruch H. The Squeezed Light Source for the Advanced Virgo Detector in the Observation Run O3. Galaxies. 2020 Nov 26;8(4):1-10. 79. doi.org/10.3390/galaxies8040079

Virgo Collaboration. Quantum Backaction on kg-Scale Mirrors: Observation of Radiation Pressure Noise in the Advanced Virgo Detector. Physical review letters. 2020 Sep 22;125(13). 131101. doi.org/10.1103/PhysRevLett.125.131101

Virgo Collaboration. Increasing the Astrophysical Reach of the Advanced Virgo Detector via the Application of Squeezed Vacuum States of Light. Physical review letters. 2019 Dez 5;123(23). 231108. doi.org/10.1103/PhysRevLett.123.231108

Involved QF Members
Members Institution Relevant Expertise
Henning Vahlbruch, LeaderAEI/LUHGeneration of squeezed states
Harald Lück AEI/LUHNext Generation Gravitational Wave Observatories; Sub-Standard Quantum Limit Interferometry
Benno WillkeAEI/LUHSqueezed Light Sources; Advanced Light Sources
Marina Trad NeryAEI/LUHAdvanced Light Sources
Moritz MehmetAEI/LUH Squeezed light sources
Joscha HeinzeAEI/LUHSqueezed light sources
Fabian MeylahnAEI/LUHSqueezed light sources
Jasper VennebergAEI/LUHSqueezed light sources
Michèle HeursAEI/LUHBackaction-Evading Techniques; Squeezed Light Sources
Jonas JunkerAEI/LUHBackaction-Evading Techniques; Squeezed Light Sources
Dennis WilkenAEI/LUHBackaction-Evading Techniques; Squeezed Light Sources