8 research outputs found
Photonic Controlled-Phase Gates Through Rydberg Blockade in Optical Cavities
We propose a novel scheme for high fidelity photonic controlled phase gates
using Rydberg blockade in an ensemble of atoms in an optical cavity. The gate
operation is obtained by first storing a photonic pulse in the ensemble and
then scattering a second pulse from the cavity, resulting in a phase change
depending on whether the first pulse contained a single photon. We show that
the combination of Rydberg blockade and optical cavities effectively enhances
the optical non-linearity created by the strong Rydberg interaction and thereby
reduces the requirements for photonic quantum gates. The resulting gate can be
implemented with cavities of moderate finesse which allows for highly efficient
processing of quantum information encoded in photons. As a particular example
of this, we show how the gate can be employed to increase the communication
rate of quantum repeaters based on atomic ensembles.Comment: main manuscript 5 pages with 11 pages of supplementary informatio
Photonic crystal nanobeam cavities with optical resonances around 800 nm
We report on the design and the fabrication of 1D photonic crystal (PhC)
nanobeam cavities with optical resonances around 800 nm, compatible with
Rubidium, Cesium or Argon atomic transitions. The cavities are made of Indium
Gallium Phosphide (InGaP) material, a III-V semi-conductor compound which has a
large index of refraction () favoring strong optical confinement
and small mode volumes. Nanobeam cavities with inline and side coupling have
been designed and fabricated, and quality factors up to have
been measured