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The recent trend towards integration of quantum optics experiments has produced a demand for on-chip single photon detectors with high quantum efficiencies. In previous work we demonstrated integrated photon number resolving detectors for use at telecommunications wavelengths [1], here we outline developments of this design which have enabled improvements in the quantum efficiency, permitting an on-chip...
We demonstrate an integrated photon-number resolving detector, operating in the telecom band at 1550 nm, employing an evanescently coupled design that allows the detector to be placed at arbitrary locations within a planar optical circuit. Up to 5 photons are resolved in the guided optical mode via absorption from the evanescent field into a tungsten transition-edge sensor. The detection efficiency...
Many free space quantum key distribution systems are restricted to operation at night. Implementing spectral, spatial and temporal filtering techniques, we were able to establish a secure key transmission over several days using entangled photons.
We provide expressions for the absolute emission rate of photon pairs produced in SPDC when all interacting fields are in a single transverse Gaussian mode.
Fast optical phase shifters and switches based on electro-optical materials are in widespread use. However, fast bulk or integrated optics devices typically work only for one polarization. We present a low-loss polarization independent device with a switching time of 1.6 ns at 100 kHz repetition rate based on a Sagnac topology.
An existing free space quantum key distribution system based on entangled photons is adapted for daylight operation. Filtering in spectral, spatial and temporal domain is optimized to maximize the signal to noise ratio so as to cope with sunlight conditions. Hardware and software are adapted for increased data processing requirements.
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