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Journal Article

Continuous-wave non-classical light with GHz squeezing bandwidth

MPS-Authors
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Ast,  Stefan
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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

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

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

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

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

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1201.5289
(Preprint), 537KB

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Citation

Ast, S., Samblowski, A., Mehmet, M., Steinlechner, S., Eberle, T., & Schnabel, R. (2012). Continuous-wave non-classical light with GHz squeezing bandwidth. Optics Letters, 37, 2367-2369. doi:10.1364/OL.37.002367.


Cite as: https://hdl.handle.net/11858/00-001M-0000-000E-EBCA-1
Abstract
Squeezed states can be employed for entanglement-based continuous-variable
quantum key distribution, where the secure key rate is proportional to the
bandwidth of the squeezing. We produced a non-classical continuous-wave laser
field at the telecommunication wavelength of 1550 nm, which showed squeezing
over a bandwidth of more than 2 GHz. The experimental setup used parametric
down-conversion via a periodically poled potassium titanyl phosphate crystal
(PPKTP). We did not use any resonant enhancement for the funda- mental
wavelength, which should in principle allow a production of squeezed light over
the full phase-matching bandwidth of several nanometers. We measured the
squeezing to be up to 0.3 dB below the vacuum noise from 50 MHz to 2 GHz
limited by the measuring bandwidth of the homodyne detector. The squeezing
strength was possibly limited by thermal lensing inside the non-linear crystal.