Rostock 2019 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 8: Quantum Optics and Photonics I
Q 8.5: Vortrag
Montag, 11. März 2019, 11:30–11:45, S Ex 04 E-Tech
Broad-angle SU(1,1) interferometer with bright squeezed vacuum — •Gaetano Frascella1,2, Eugeniy E. Mikhailov3, Naoto Takanashi4, Roman T. Zakharov5,6, Olga V. Tikhonova5,6, and Maria V. Chekhova1,2,5 — 1Max-Planck Institute for the Science of Light, Erlangen, Germany — 2Univ. of Erlangen-Nuremberg, Erlangen, Germany — 3Department of Physics, College of William & Mary, Williamsburg, Virginia, USA — 4School of Engineering, Univ. of Tokyo, Tokyo, Japan — 5Physics Department, Moscow State Univ., Moscow, Russia — 6Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State Univ., Moscow, Russia
Bright squeezed vacuum raises interest due to its nonclassical features, like the macroscopic photon-number entanglement, and due to the potential applications ranging from imaging to remote sensing and quantum communication.
We produce this state of light through the high-gain parametric down conversion (PDC) in a nonlinear crystal and, using a double-pass configuration, we build a broad-angle SU(1,1) interferometer. The correction of the angular divergence of PDC in the first pass enables the phase-sensitive amplification/de-amplification of the spatially multimode radiation, while the mode content remains stable as the phase changes. In comparison to previous arrangements, our construction features a richer spatial mode structure.
We prove the quantum signature of the interferometer by measuring quadrature squeezing of 3.9 dB with optical parametric amplification, which amplifies one quadrature while attenuating the other.