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Distributed quantum sensing of multiple phases with fewer photons
Dong-Hyun Kim1,2, Seongjin Hong3, Yong-Su Kim1,4
1Center for Quantum Information, Korea Institute of Science and Technology (KIST), Seoul, 02792, Korea.
Nature Communications
|January 11, 2024
Summary
This study demonstrates distributed quantum sensing using fewer photons than parameters, achieving enhanced sensitivity. This breakthrough enables large-scale quantum sensing with existing entangled sources.
Area of Science:
- Quantum physics
- Metrology
- Quantum sensing
Background:
- Distributed quantum metrology offers enhanced parameter estimation beyond classical limits.
- Current methods often require a high number of entangled photons, limiting scalability.
Purpose of the Study:
- To present a novel distributed quantum sensing scheme.
- To achieve quantum-enhanced sensitivity with fewer photons than parameters.
- To demonstrate the feasibility of large-scale distributed quantum sensing.
Main Methods:
- Utilized a two-photon entangled state for distributed phase estimation.
- Experimentally demonstrated the scheme over a 3 km distance.
- Compared results against the standard quantum limit.
Main Results:
- Achieved quantum-enhanced sensitivity with fewer photons than parameters.
- Demonstrated a 2.2 dB sensitivity enhancement beyond the standard quantum limit.
- Confirmed Heisenberg scaling is possible under these conditions.
Conclusions:
- The proposed scheme overcomes the photon-number limitation of previous methods.
- Enables practical, large-scale distributed quantum sensing using current entangled sources.
- Paves the way for advancements in quantum metrology and sensing networks.
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