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Full Name: 
Bright Squeezed Vacuum and its Applications
Dr. Maria Chekhova


Max Planck Institute for the Science of Light
Günther-Scharowsky-Str. 1 Bulding 24
49° 34' 28.452" N, 11° 0' 32.868" E
Running time: 
2012-12-01 - 2015-11-30

Currently, a widely accepted viewpoint is that only microscopic objects behave in a truly quantum way. As a collaboration of research teams from Germany, Italy, Russia, Czech Republic and Poland the project BRISQ2 aims at investigating the properties of a new state of quantum light, the bright squeezed vacuum, being a counter-example to this opinion.

The bright squeezed vacuum emerges at the output of an unseeded parametric amplifier. It is called vacuum because it has zero mean values of electric and magnetic fields or, in other words, it contains only fluctuations. However, these fluctuations amount to macroscopic numbers of photons and are therefore bright. More importantly, bright squeezed vacuum consists of light beams with perfect correlations in photon numbers (photon-number squeezing).

BRISQ2 will study the amount of quantum features (nonclassicality, entanglement) contained in bright squeezed vacuum, its mode structure and the perspectives of engineering or filtering this structure. Furthermore, the project implies application of bright squeezed vacuum to quantum imaging, quantum metrology, and quantum key distribution.

In the long term, BRISQ2 will lead to the full integration of bright squeezed vacuum into quantum information technology, where it will be used both for processing and carrying of quantum information.

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