AI Article Synopsis
- The study explores the capabilities of continuous-variable quantum networks in enhancing quantum metrology, specifically for distributed quantum displacement sensing.
- It shows that these networks can achieve Heisenberg scaling in sensitivity due to the entanglement of quantum states across distant nodes, surpassing the limits of unentangled states.
- The researchers demonstrate that local operations can be performed after entanglement is established, and they identify a photon-loss rate that still allows for quantum benefits, even in scenarios with local beam splitters in the network.
Article Abstract
We investigate the quantum metrological power of typical continuous-variable (CV) quantum networks. Particularly, we show that most CV quantum networks provide an entanglement to quantum states in distant nodes that enables one to achieve the Heisenberg scaling in the number of modes for distributed quantum displacement sensing, which cannot be attained using an unentangled probe state. Notably, our scheme only requires local operations and measurements after generating an entangled probe using the quantum network. In addition, we find a tolerable photon-loss rate that maintains the quantum enhancement. Finally, we numerically demonstrate that even when CV quantum networks are composed of local beam splitters, the quantum enhancement can be attained when the depth is sufficiently large.
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| http://dx.doi.org/10.1103/PhysRevLett.128.180503 | DOI Listing |
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