3:30pm - 4:00pmInvitedID: 474
/ TOM6 S04: 1
TOM 6 Nonlinear and Quantum Optics
Spatially entangled states of light in nonlinear waveguide arrays
Arnault Raymond1, Saverio Francesconi1, José Palomo2, Pascal Filloux1, Martina Morassi3, Aristide Lemaître3, Fabrice Raineri3,4, Maria Amanti1, Sara Ducci1, Florent Baboux1
1Université Paris Cité, France; 2LPENS, Université PSL, France; 3Université Paris-Saclay, CNRS, France; 4Université Côte d’Azur, France
We demonstrate a nonlinear AlGaAs photonic chip generating biphotons with nonclassical spatial correlations. Photon pairs are generated by parametric down conversion in a waveguide array and simultaneously spread through quantum walks along the various waveguides. This concept implements a compact and versatile source of spatially entangled states, operating at room temperature and telecom wavelength, that could serve as a workbench for simulating condensed matter problems on-chip.
4:00pm - 4:15pmID: 175
/ TOM6 S04: 2
TOM 6 Nonlinear and Quantum Optics
Broadband biphoton generation and polarization splitting in a monolithic AlGaAs chip
Othmane Meskine1, Félicien Appas1,2, Aristide Lemaître3, José Palomo4, Florent Baboux1, Maria I. Amanti1, Sara Ducci1
1Université Paris Cité, CNRS, Laboratoire Matériaux et Phénomènes Quantiques, 75013 Paris, France; 2ICFO - Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Castelldefels (Barcelona) 08860, Spain; 3Université Paris-Saclay, CNRS, Centre de Nanosciences et de Nanotechnologies, 91120, Palaiseau, France; 4Laboratoire de Physique de l’École normale supérieure, ENS, Université PSL, CNRS, Sorbonne Université, Université Paris Cité, 75005 Paris, France
Integrated quantum photonics is a key tool towards large scale quantum technologies. In this work we present an AlGaAs-based photonic circuit for the on-chip generation of broadband orthogonally polarized photons and the deterministic separation of the photons into separate spatial modes, facilitating their further use in protocols. We demonstrate that 85% of the pairs are deterministically separated by the chip over a full 60 nm bandwidth and we assess the chip operation in the quantum regime via a Hong-Ou-Mandel experiment displaying a raw visibility of 75.5% over the same full bandwidth.
4:15pm - 4:30pmID: 117
/ TOM6 S04: 3
TOM 6 Nonlinear and Quantum Optics
Local sampling of the SU(1,1) Wigner function
Nicolas Fabre1, Andrei Klimov2, Gerd Leuchs3,4, Luis Sanchez Soto3,5
1Telecom Paris, France; 2Departamento de Física, Universidad de Guadalajara, 44420 Guadalajara, Jalisco, Mexico; 3Max-Planck-Institut für die Physik des Lichts, 91058 Erlangen, Germany; 4Institut für Optik, Information und Photonik, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany; 5Departamento de Óptica, Universidad Complutense, 28040 Madrid, Spain
The Wigner phase-space formulation for systems possessing SU(1,1) symmetry has been defined by Seyfarth et al. [Quantum 4, 317 (2020)] tackling the difficulty in defining a suitable operational definition of the Wigner function. To further investigate this formulation, we propose a non-linear optical setup that incorporates photon-number-resolving detectors, which would enable a direct and comprehensive point-by-point sampling of the SU(1,1) Wigner function. We discuss the visualization of various two-mode quantum states and the effect of the losses in such a detection scheme.
4:30pm - 4:45pmID: 160
/ TOM6 S04: 4
TOM 6 Nonlinear and Quantum Optics
Making entanglement between photonic Orbital Angular Momenta by Spontaneous Four Wave Mixing in an atomic vapor
Laurence Pruvost, Myrann Abobaker
LCPMR, CNRS, Sorbonne-Université, France
Spontaneous Four Wave Mixing (SFWM) which generates photonic pairs is studied if it is addressed by optical vortices carrying an orbital angular momentum (OAM). We show that the output beams are OAM-correlated and that the entanglement depends on the 4-level scheme used to realize SFWM.
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