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Negative Wigner function at telecommunication wavelength from homodyne detection

MPG-Autoren

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

Fiurasek,  Jaromir
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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1703.02786.pdf
(Preprint), 849KB

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Zitation

Baune, C., Fiurasek, J., & Schnabel, R. (2017). Negative Wigner function at telecommunication wavelength from homodyne detection. Physical Review A, 95(6): 061802. doi:10.1103/PhysRevA.95.061802.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-002D-AC3A-9
Zusammenfassung
Quantum states of light having a Wigner function with negative values represent a key resource in quantum communication and quantum information processing. Here, we present the generation of such a state at the telecommunication wavelength of 1550nm. The state is generated by means of photon subtraction from a weakly squeezed vacuum state and is heralded by the `click' of a single photon counter. Balanced homodyne detection is applied to reconstruct the Wigner function, also yielding the state's photon number distribution. The heralding photons are frequency up-converted to 532nm to allow for the use of a room-temperature (silicon) avalanche photo diode. The Wigner function reads W(0,0)=-0.063 +/- 0.004 at the origin of phase space, which certifies negativity with more than 15 standard deviations.