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Towards long-distance quantum networks with superconducting processors and optical links

Kumar, Sourabh and Lauk, Nikolai and Simon, Christoph (2019) Towards long-distance quantum networks with superconducting processors and optical links. Quantum Science and Technology, 4 (4). Art. No. 045003. ISSN 2058-9565.

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We design a quantum repeater architecture, necessary for long distance quantum networks, using the recently proposed microwave cat state qubits, formed and manipulated via interaction between a superconducting nonlinear element and a microwave cavity. These qubits are especially attractive for repeaters because in addition to serving as excellent computational units with deterministic gate operations, they also have coherence times long enough to deal with the unavoidable propagation delays. Since microwave photons are too low in energy to be able to carry quantum information over long distances, as an intermediate step, we expand on a recently proposed microwave to optical transduction protocol using excited states of a rare-earth ion (Er^(3+)) doped crystal. To enhance the entanglement distribution rate, we propose to use spectral multiplexing by employing an array of cavities at each node. We compare our achievable rates with direct transmission and with two other promising repeater approaches, and show that ours could be higher in appropriate regimes, even in the presence of realistic imperfections and noise, while maintaining reasonably high fidelities of the final state. Thus, in the short term, our work could be directly useful for secure quantum communication, whereas in the long term, we can envision a large scale distributed quantum computing network built on our architecture.

Item Type:Article
Related URLs:
URLURL TypeDescription
Kumar, Sourabh0000-0003-4112-0896
Additional Information:© 2019 IOP Publishing Ltd. Received 2 January 2019; Accepted 25 June 2019; Accepted Manuscript online 26 June 2019; Published 30 July 2019.
Funding AgencyGrant Number
Alberta Innovates - Technology FuturesUNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
University of CalgaryUNSPECIFIED
INtelligent Quantum NEtworks and Technologies (INQNET)UNSPECIFIED
Issue or Number:4
Record Number:CaltechAUTHORS:20190730-085231671
Persistent URL:
Official Citation:Sourabh Kumar et al 2019 Quantum Sci. Technol. 4 045003
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97509
Deposited By: Tony Diaz
Deposited On:30 Jul 2019 16:00
Last Modified:31 Jan 2020 21:18

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