Certifying Quantum Network Functionality
October 16th, 2017 VICTORIA LIPINSKA QUTech

Quantum communication is a core element of quantum information science. The most general communication scenario involves separated nodes exchanging quantum information at a large distance, which defines a quantum network. Recently, various operational stages of network functionality were defined in terms of classes of protocols that can be performed with certain resources. Importantly, there exists a class of protocols, involving e.g. blind quantum computing or generating anonymous entanglement, which crucially requires storing a quantum state while being able to perform universal local operations. However, state of the art implementations can only achieve either good local control or good quantum memory. We propose a simple testing protocol, which we call memory and control test, that provides an explicit certification of attainment of both tasks simultaneously. Specifically, we present a protocol based on multi-round teleportation in the presence of universal local gates. We adapt it to experimentally feasible scenarios, where imperfections naturally arise, and provide explicit parameters for estimating the quality of universal gates in the presence of noisy memory. Moreover, based on the test we estimate the performance of other protocols relevant for the stage.

Seminar, October 16, 2017, 12:00. ICFO’s Seminar Room

Hosted by Prof. Antonio Acín