High-Purity Entanglement of Hot Propagating Modes Using Nonreciprocity

L. Orr, Saeed A. Khan, N. Buchholz, S. Kotler, A. Metelmann

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Distributed quantum information processing and communication protocols demand the ability to generate entanglement among propagating modes. However, thermal fluctuations can severely limit the fidelity and purity of propagating entangled states, especially for low-frequency modes relevant for radio-frequency (rf) signals. Here, we propose nonreciprocity as a resource to render continuous-variable entanglement of propagating modes robust against thermal fluctuations. By utilizing a cold-engineered reservoir, we break the symmetry of reciprocity in a standard two-mode squeezing interaction between a low- and a high-frequency mode and show that the rerouting of thermal fluctuations allows the generation of flying entangled states with high purity. Our approach requires only pairwise Gaussian interactions and is thus ideal for parametric circuit-QED implementations.

Original languageAmerican English
Article number020344
JournalPRX Quantum
Issue number2
StatePublished - Apr 2023

Bibliographical note

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© 2023 authors. Published by the American Physical Society.


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