Continuous-Variable Square-Ladder Cluster States in a Microwave Frequency Comb
We describe an experiment demonstrating the generation of three independent square-ladder continuous-variable cluster states with up to 94 qumodes of a microwave frequency comb. This entanglement structure at a large scale is realized by injecting vacuum fluctuations into a Josephson Parametric Amplifier pumped by three coherent signals around twice its resonance frequency, each having a particular well-defined phase relation. We reach up to 1.4 dB of squeezing of the nullifier that verifies the cluster state on the square ladder graph. Our results are consistent with a more familiar measure of two-mode squeezing, where we find up to 5.42 dB for one pump, and up to 1 dB for three pumps.
Authors
- J. C. Rivera Hernández (ORCID: https://orcid.org/0000-0001-8004-9303)
- Fabio Lingua (ORCID: https://orcid.org/0000-0001-6395-1258)
- David B. Haviland (ORCID: https://orcid.org/0000-0001-8534-6577)
- Michele Cortinovis
Institutions
- KTH Royal Institute of Technology (SE)
- Politecnico di Milano (IT)
Publication Details
- Journal
- Physical Review Letters
- Published
- 2025-05-09
- DOI
- https://doi.org/10.1103/physrevlett.134.183602
- Citations
- 3
- Primary Topic
- Quantum Information and Cryptography
- Type
- article
- Field-Weighted Citation Impact
- 7.44
Funders
- Knut och Alice Wallenbergs Stiftelse
- National Institute of Standards and Technology
- Wallenberg Center for Quantum Technology, Chalmers University of Technology