Entangling Superconducting Qubits over Optical Fiber – Towards Optimization and Implementation

Published

November 22, 2022

Author(s)

Curtis Rau, Akira Kyle, Alexander Kwiatkowski, Will Warfield, Jacob Davidson, Maxime Nurwubusa, John Teufel, Ezad Shojaee, Konrad Lehnert, Tasshi Dennis

Abstract

A quantum network linking superconducting quantum computers would enable highly sought-after applications such as distributed quantum computing. Optical photons are the natural way of encoding information for long distance communication; however, exchanging quantum information between optical and microwave domains requires a quantum transducer. There are many ways transducers could be integrated into a network which leads to the question: Which network is most tolerant of current transducers which are far from perfect? A logical metric for optimizing the first quantum networks is the entanglement threshold which is necessary and sufficient condition on network parameters for microwave-microwave entanglement. Here we first address the problem of finding the network with the least restrictive entanglement threshold on physical parameters. For tractability we restrict our study to networks containing only gaussian states, operations, and measurements which are among the most readily experimentally accessible options. Within this vast space of possible network configurations, we identify a small set of topologies which we believe to be optimal. We find that with previously reported technology some of these topologies are capable of entangling remote microwave modes, despite imperfections in current transduction technology. Finally, progress towards a physical implementation of one of these topologies is discussed.

Proceedings Title

Proceedings of IEEE International Conference on Quantum Computing and Engineering

Conference Dates

September 18-23, 2022

Conference Location

Broomfield, CO, US

Conference Title

IEEE International Conference on Quantum Computing and Engineering - QCE22

Pub Type

Conferences

Download Paper

https://doi.org/10.1109/QCE53715.2022.00112

Local Download

Keywords

quantum networks, quantum computers, superconductors, entanglement, quantum transduction, optical communications, network topologies

Citation

Rau, C. , Kyle, A. , Kwiatkowski, A. , Warfield, W. , Davidson, J. , Nurwubusa, M. , Teufel, J. , Shojaee, E. , Lehnert, K. and Dennis, T. (2022), Entangling Superconducting Qubits over Optical Fiber – Towards Optimization and Implementation, Proceedings of IEEE International Conference on Quantum Computing and Engineering, Broomfield, CO, US, [online], https://doi.org/10.1109/QCE53715.2022.00112, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=935387 (Accessed January 16, 2025)