Presentation
Entanglement Capacity Estimates and Throughput Measurements of Quantum Channels
SessionThe 11th Annual International Workshop on Innovating the Network for Data Intensive Science - INDIS
DescriptionThe throughput is an important performance metric of entangled qubit distribution quantum networks, and is characterized by the number of distributed entangled pairs of entanglement bits per second (ebps). It is measured over physical connections using specialized instruments, including photonic entanglement sources and single photon detectors. Extensive theory has been developed to estimate the entangled qubit capacity of quantum channels using abstractions of physical connections. These two quantities both characterize aspects of performance but in different ways, and typically have been hard to relate to each other. We describe measurements on physical testbed with fiber connections of lengths 0-75 kilometers. We obtain the normalized analytic capacity estimates using the transmissivity approximations derived using single photon coincidence measurements, and convert them to bounds on throughput (measured in ebps) using a multiplier derived from co-located detector measurements. The results indicate consistent throughput measurements upper-bounded by their analytical capacity estimates across all connections.