Nagi Rao is a Corporate Fellow at Oak Ridge National Laboratory, where he joined in 1993. His research interests include high-performance and quantum networking, instrument-computing networks, and domain-informed machine learning. He developed custom networking and machine learning solutions under projects funded by DOD, DOE and NSF. He received PhD from Louisiana State University and ME from Indian Institute of Science, both in computer science. He is a Life Fellow of IEEE.
Presentation Title:
Entanglement Throughput Over Fiber Connections:Â Measurements and Capacity Estimates
Presentation Abstract:
The throughput of entangled qubit pairs per second (eqps) is a basic performance metric of quantum networks. It is measured using specialized instruments, including photonic entanglement sources and single-photon detectors. Extensive theory has been developed to estimate the capacity of a generic quantum channel, which specifies the maximum achievable eqps over a fiber connection. However, there is a gap in relating these two characterizations due to the disparate nature of mathematical formulae of the channel capacity and specialized eqps measurements. We describe eqps measurements collected over connections of lengths up to 65 km composed of aerial-inground loops, fiber spools, and their hybrid compositions. We estimate the normalized capacity using the transmissivity parameter derived from single photon detector measurements. The results indicate consistency between eqps measurements and their capacity estimates across all three types of fiber connections and provide insights into relating the parameters of analytic capacity estimates to physical measurements.