Seminar
Optical interfaces for quantum communications: spectral multiplexing and hybrid protocols
Speaker: Tanmoy Chakraborty (Delft University of Technology, Netherlands)
Abstract: Multiplexed quantum repeater architectures require an optical interface that comprises multiplexed sources of photon pairs and photon detection mechanisms that can distinguish between the multiple modes of the photons. I will present the development of a novel alignment-free, spectrally multiplexed photon pair source that is based on cavity-enhanced spontaneous parametric down-conversion (SPDC) in a nonlinear crystal and is easy to integrate with a practical quantum repeater. I will also present the design and implementation of a novel demultiplexing setup for spectrally-resolved detection of the photons. I will show the characterization of multiple pairs of spectrally-resolved modes and demonstrate a spectrally-resolved optical interface of our single photon source with thulium-doped lithium niobate crystal, a candidate for multiplexed quantum memory. Moreover, I will present hybrid quantum interfaces between a nitrogen vacancy (NV) center in diamond-based quantum network node and 795 nm photonic time-bins, compatible with thulium and rubidium quantum memories.
***** सभी का स्वागत है / All Are Welcome *****