2 research outputs found
Optimizing single-photon-source heralding efficiency at 1550 nm using periodically poled lithium niobate
We explore the feasibility of using high conversion-efficiency
periodically-poled crystals to produce photon pairs for photon-counting
detector calibrations at 1550 nm. The goal is the development of an appropriate
parametric down-conversion (PDC) source at telecom wavelengths meeting the
requirements of high-efficiency pair production and collection in single
spectral and spatial modes (single-mode fibers). We propose a protocol to
optimize the photon collection, noise levels and the uncertainty evaluation.
This study ties together the results of our efforts to model the single-mode
heralding efficiency of a two-photon PDC source and to estimate the heralding
uncertainty of such a source.Comment: 14 pages, 2 tables and 3 figures, final version accepted by
Metrologi
Narrowband polarization-entangled photon pairs distributed over a WDM link for qubit networks
We present a bright, narrowband, portable, quasi-phase-matched two-crystal
source generating polarization-entangled photon pairs at 809 nm and 1555 nm at
a maximum rate of 1.2 10^6 s-1 THz-1 mW-1 after coupling to single-mode fiber.
The quantum channel at 1555 nm and the synchronization signal gating the single
photon detector are multiplexed in the same optical fiber of length 27 km by
means of wavelength division multiplexers (WDM) having 100 GHz (0.8 nm) spacing
between channels. This implementation makes quantum communication applications
compatible with current high-speed optical networks.Comment: 8 pages, 4 figure