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Improving metrology with quantum scrambling
Zeyang Li1, Simone Colombo1, Chi Shu1,2
1Department of Physics, MIT-Harvard Center for Ultracold Atoms, Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Science (New York, N.Y.)
|June 29, 2023
Summary
Quantum scrambling, the spreading of quantum information, was studied near a bistable point. This research demonstrates its utility in entanglement-enhanced metrology, achieving significant gains beyond the standard quantum limit.
Area of Science:
- Quantum physics
- Quantum information science
Background:
- Quantum scrambling explains information delocalization in quantum systems, relevant to thermalization and black hole information paradox.
- Understanding scrambling dynamics is crucial for quantum information processing.
Purpose of the Study:
- To investigate exponential quantum scrambling in a multiparticle system near a phase space bistable point.
- To utilize quantum scrambling for entanglement-enhanced metrology.
- To experimentally verify the link between quantum metrology and quantum information scrambling.
Main Methods:
- Probing exponential scrambling dynamics near a bistable point.
- Employing a time-reversal protocol.
- Measuring out-of-time-order correlators (OTOCs).
Main Results:
- Observed simultaneous exponential growth of metrological gain and OTOCs.
- Demonstrated rapid scrambling dynamics enabling fast entanglement generation.
- Achieved a 6.8(4)-decibel gain in metrology beyond the standard quantum limit.
Conclusions:
- Experimental verification of the relationship between quantum metrology and quantum information scrambling.
- Rapid quantum scrambling dynamics are beneficial for practical metrology applications.
- Quantum scrambling offers a pathway to surpass classical measurement limits.
