Waveguide integrated superconducting single photon detectors for efficient NV entanglement generation

Presenting Author: Srivatsa Chakravarthi, University of Washington
Contributing Author(s): Michael Gould, Kai-Mei Fu

Optically accessible solid-state defects are heralded as a promising platform for distributed quantum computation. The NV center in diamond is attractive due to its long electron spin-coherence time and access to multiple nuclear spins which could be utilized for topologically protected cluster-state generation. However, a complete platform to efficiently entangle multiple NV centers remains elusive. The entanglement generation rate is proportional to the square of the NV photon detection rate. Here we present recent results in a gallium phosphide(GaP)-on-diamond photonic platform designed for efficient NV photon detection rate. With a larger refractive index than diamond (3.3 vs. 2.4), GaP photonics allow efficient NV photon collection and routing. The ultra-smooth GaP surface profile allows integration of superconducting nanowire single photon detectors (SNSPD). We fabricated and characterized large number of niobium nitride SNSPDs coupled to waveguides and demonstrated on-chip photon detection from single photons. We will give an overview of our SNSPDs that have high detection efficiency, large maximum count rates(MHz) and low dark counts(<1Hz). We expect this technology to be a critical step toward efficient entanglement generation. All fabrication performed at Washington Nanofabrication Facility, University of Washington, Seattle an NSF NNCI node. work supported by the NSF under Grant No. (1640986, 1506473) and ) and the DARPA QUINESS Program.

(Session 5 : Thursday from 5:00pm - 7:00 pm)


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