Quadrature entanglement in the microwave domain with a phase locking protocol

Entanglement has attracted great attention in the past few decades due to its potential applications in the field of quantum information protocols. From now, achieving excellent phase locking in entanglement generation is significant yet a challenging task in cryogenic quantum technology. In this wo...

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Bibliographic Details
Published in:Europhysics letters 2022-05, Vol.138 (3), p.38001
Main Authors: Wei, Tianli, Wu, Dewei, Miao, Qiang, Yang, Chunyan
Format: Article
Language:English
Subjects:
Error signals
Locking
Microwaves
Parametric amplifiers
Quadratures
Quantum entanglement
Quantum phenomena
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Summary:Entanglement has attracted great attention in the past few decades due to its potential applications in the field of quantum information protocols. From now, achieving excellent phase locking in entanglement generation is significant yet a challenging task in cryogenic quantum technology. In this work, we propose and demonstrate a comprehensive paradigm of phase locking protocol for quadrature entanglement at the microwave wavelengths. We carry out a theoretical derivation of the quadrature entangled microwaves generated based on Josephson parametric amplifiers (JPAs), and the phase locking error signal, which is used to lock the relative phase of zero between the two quadrature squeezed microwaves. Simulating data for the phase locking scheme are shown under different parameter settings for comparison. Finally, we use the proposed phase locking scheme to enable a stable output of quadrature entangled microwave.
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/ac3bdb