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Journal Article

Quantum-Dense Metrology

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons1464

Steinlechner,  Sebastian
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons40427

Bauchrowitz,  Jöran
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons40482

Müller-Ebhardt,  Helge
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons40437

Danzmann,  Karsten
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons40490

Schnabel,  Roman
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Fulltext (public)

1211.3570.pdf
(Preprint), 342KB

nphoton.2013.150.pdf
(Any fulltext), 547KB

Supplementary Material (public)
There is no public supplementary material available
Citation

Steinlechner, S., Bauchrowitz, J., Meinders, M., Müller-Ebhardt, H., Danzmann, K., & Schnabel, R. (2013). Quantum-Dense Metrology. Nature Photonics, 7: 150, pp. 626-630. doi:10.1038/nphoton.2013.150.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0013-7681-7
Abstract
Quantum metrology utilizes entanglement for improving the sensitivity of measurements. Up to now the focus has been on the measurement of just one out of two non-commuting observables. Here we demonstrate a laser interferometer that provides information about two non-commuting observables, with uncertainties below that of the meter's quantum ground state. Our experiment is a proof-of-principle of quantum dense metrology, and uses the additional information to distinguish between the actual phase signal and a parasitic signal due to scattered and frequency shifted photons. Our approach can be readily applied to improve squeezed-light enhanced gravitational-wave detectors at non-quantum noise limited detection frequencies in terms of a sub shot-noise veto-channel.