Journal
PHYSICAL REVIEW LETTERS
Volume 128, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.128.180503
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Funding
- National Research Foundation of Korea [NRF-2019M3E4A1080074, NRF-2020R1A2C1008609, NRF-2020K2A9A1A06102946]
- Institute of Information & Communications Technology Planning & Evaluation (IITP) - Korea government (MSIT) [IITP-2021-0-01059, IITP-2022-2020-0-01606]
- Ministry of Science and ICT [NRF-2020M3E4A1077861]
- KIAS Individual Grant [CG073301]
- ARO [W911NF-18-1-0020, W911NF-18-1-0212]
- ARO MURI [W911NF-16-1-0349, W911NF-21-1-0325]
- AFOSR MURI [W911NF-16-1-0349, W911NF-21-1-0325, FA9550-19-1-0399]
- DoE Q-NEXT, NSF [EFMA-1640959, OMA-1936118, EEC-1941583, OMA-2137642]
- NTT Research
- Packard Foundation [2013-39273]
- National Research Foundation of Korea [2020K2A9A1A06102946] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The quantum metrological power of typical continuous-variable quantum networks is investigated in this study. It is shown that these networks can enable Heisenberg scaling in the number of modes for distributed quantum displacement sensing by providing entanglement to quantum states in distant nodes. The quantum enhancement can be achieved using local operations and measurements.
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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