ForschungTopical Groups
Non-classical Light

Non-classical Light

The generation of squeezed states of light and the application in quantum metrology, measurement induced entanglement and high-precision spectroscopy.


  • 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


Heinze J, Danzmann K, Willke B, Vahlbruch H. 10 dB Quantum-Enhanced Michelson Interferometer with Balanced Homodyne Detection. Physical review letters. 2022 Jul 15;129(3). 031101.

Heinze J, Willke B, Vahlbruch H. Observation of Squeezed States of Light in Higher-Order Hermite-Gaussian Modes with a Quantum Noise Reduction of up to 10 dB. Physical review letters. 2022 Feb 25;128(8). 083606.

Junker J, Wilken D, Johny N, Steinmeyer D, Heurs M. Frequency-Dependent Squeezing from a Detuned Squeezer. Physical review letters. 2022 Jul 14;129(3). 033602.

Meylahn F, Willke B, Vahlbruch H. Squeezed States of Light for Future Gravitational Wave Detectors at a Wavelength of 1550 nm. Physical review letters. 2022 Sep 16;129(12). 121103.

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.


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.

Nery MT, Venneberg JR, Aggarwal N, Cole GD, Corbitt T, Cripe J et al. Laser power stabilization via radiation pressure. Optics letters. 2021 Apr 14;46(8):1946-1949.

Trad Nery M. Laser power stabilization via radiation pressure. Nature Reviews Physics. 2021 Okt;3(10):677.


Vermeulen SM, Relton P, Grote H, Raymond V, Affeldt C, Bergamin F et al. Direct limits for scalar field dark matter from a gravitational-wave detector. NATURE. 2021 Dez 16;600(7889):424-428.

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.



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.

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.

Nery MT, Danilishin SL, Venneberg JR, Willke B. Fundamental limits of laser power stabilization via a radiation pressure transfer scheme. Optics letters. 2020 Jul 10;45(14):3969-3972.

Zhao Y, Aritomi N, Capocasa E, Leonardi M, Eisenmann M, Guo Y et al. Frequency-Dependent Squeezed Vacuum Source for Broadband Quantum Noise Reduction in Advanced Gravitational-Wave Detectors. Physical review letters. 2020 Mai 1;124(17). 171101.

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.

Mehmet M, Vahlbruch H. High-efficiency squeezed light generation for gravitational wave detectors. Classical and Quantum Gravity. 2019 Jan 10;36(1). 015014.

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.

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