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Driving Enhanced Quantum Sensing in Partially Accessible Many-Body Systems
Utkarsh Mishra1, Abolfazl Bayat1
1Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, China.
Physical Review Letters
|September 3, 2021
Summary
Quantum sensing with partially accessible systems can be improved using periodic driving. This method achieves super-Heisenberg scaling by utilizing a local steady state, outperforming ground-state criticality.
Area of Science:
- Quantum Information Science
- Condensed Matter Physics
- Quantum Sensing
Background:
- Ground-state criticality in many-body systems offers Heisenberg precision limits for quantum sensing when the entire system is accessible.
- Partial accessibility of a spin system in its ground state limits sensing capabilities to the sub-Heisenberg precision.
- Existing quantum sensing protocols often require global access to the system, limiting practical applications.
Purpose of the Study:
- To investigate methods for enhancing quantum sensing precision in many-body systems with partial accessibility.
- To explore the potential of using driven Hamiltonians and local steady states for improved quantum sensing.
- To understand the underlying mechanisms responsible for precision enhancement in driven quantum systems.
Main Methods:
- Analysis of sensing capabilities in partially accessible spin systems at ground-state criticality.
- Implementation of periodic driving of the Hamiltonian to create a local steady state for sensing.
- Investigation of the Floquet quasienergy gap dynamics and its relation to sensing precision.
Main Results:
- Partial accessibility reduces ground-state sensing precision to the sub-Heisenberg limit.
- Periodic driving and utilizing a local steady state significantly enhance sensing precision compared to ground-state sensing.
- Super-Heisenberg scaling is achieved for low driving frequencies, linked to the closing of the Floquet quasienergy gap.
Conclusions:
- Periodic driving offers a viable strategy to overcome precision limitations in partially accessible quantum sensing.
- The observed precision enhancement is analogous to the vanishing energy gap at criticality in globally accessible systems.
- The proposed method is general for integrable models and compatible with current quantum devices.
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