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On the Stochastic Analysis of a Quantum Entanglement Switch

27 Mar
Wednesday, 03/27/2019 12:15pm to 1:15pm
Computer Science Building, Room 140
Theory Seminar
Speaker: Gayane Vardoyan

Entanglement is an essential component of quantum computation, information, and communication. Its applications range from cryptography (e.g. quantum key distribution, quantum error correction) to ensemble sensing (e.g. multipartite entanglement for quantum metrology and spectroscopy). These applications drive the increasing need for a quantum switching network that can supply end-to-end entanglements to groups of endpoints that request them. To this end, we study a quantum entanglement switch that serves users in a star topology. We model variants of the system using Markov chains and standard queueing theory and obtain expressions for switch capacity and the expected number of qubits stored in memory at the switch. Much of this work focuses on bipartite entanglement switching. For this case, we discover that in general, buffer size and decoherence have little effect on performance metrics when the links are homogeneous. When the links are heterogeneous, these effects are more significant. We also derive analytical results for the case of a tripartite entanglement switch and make a conjecture for the case of an n-partite entanglement switch. Finally, we explore a set of switching policies for a switch that can serve both bi- and tripartite entanglements.

This talk is aimed at a general audience and will cover basics of quantum computing. I will cover the main results from our recent work "On the Capacity Region of Bipartite and Tripartite Entanglement Switching" (arXiv:1901.06786) and "Performance  Evaluation of a Quantum Entanglement Switch" (arXiv:1903.04420).