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Updated: Jun 14, 2026
07:56
A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
Quantum-Enhanced Sensing Enabled by Scrambling-Induced Genuine Multipartite Entanglement
Guantian Hu1,2, Wenxuan Zhang2,3, Zhihua Chen4
1Nanjing University, National Laboratory of Solid State Microstructures, School of Physics, Nanjing 210093, China.
Physical Review Letters
|June 12, 2026
Summary
Researchers demonstrate a new quantum sensing method using information scrambling. This approach enhances phase sensitivity beyond the standard quantum limit, offering a scalable path for quantum-enhanced sensing in complex systems.
Area of Science:
- Quantum physics
- Quantum information science
- Metrology
Background:
- Quantum sensing utilizes quantum phenomena to exceed classical measurement limits.
- Existing methods often require complex entangled states and Hamiltonian engineering, limiting scalability.
- Information scrambling offers a novel approach to quantum-enhanced sensing.
Purpose of the Study:
- To experimentally implement and validate a universal butterfly metrology protocol.
- To demonstrate quantum-enhanced phase sensitivity using information scrambling.
- To explore the connection between scrambling dynamics and entanglement in enhancing sensitivity.
Main Methods:
- Experimental implementation on a superconducting quantum processor.
- Utilizing many-body information scrambling via a universal butterfly metrology protocol.
- Measuring out-of-time-order correlators to analyze scrambling dynamics.
Main Results:
- Observed quantum-enhanced phase sensitivity surpassing the standard quantum limit.
- Achieved scaling close to the Heisenberg limit for systems up to 10 qubits.
- Established an experimental link between enhanced sensitivity and out-of-time-order correlator dynamics.
- Demonstrated that scrambling-induced genuine multipartite entanglement drives the sensitivity enhancement.
Conclusions:
- The butterfly metrology protocol provides a scalable approach for quantum-enhanced sensing.
- Information scrambling and multipartite entanglement are key resources for improving sensor precision.
- This work paves the way for practical quantum-enhanced sensing in interacting many-body systems.
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