Entanglement-Enhanced Quantum Sensing via Optimal Global Control with Neutral Atoms in a Cavity

Area of Science:

• Quantum Information Science
• Atomic, Molecular, and Optical Physics
• Quantum Sensing

Background:

• Entangled states are crucial for advancing quantum technologies.
• Quantum sensing aims to surpass classical precision limits.
• Dicke states offer unique properties for multi-qubit systems.

Purpose of the Study:

• To present a deterministic protocol for preparing entangled Dicke states.
• To achieve enhanced precision in quantum sensing beyond the standard quantum limit.
• To address noise and loss in quantum systems.

Main Methods:

• Utilizing a novel geometric phase gate for unitary synthesis.
• Developing an analytic solution for noisy quantum channel dynamics.
• Applying optimal control methods for state preparation.

Main Results:

• Successfully prepared entangled states in the symmetric Dicke subspace.
• Demonstrated quantum sensing precision significantly better than the standard quantum limit.
• The protocol is robust against photon cavity loss, spontaneous emission, and dephasing.

Conclusions:

• The developed protocol enables entanglement-enhanced quantum sensing with cold atoms in cavities.
• The method is extendable to other spin-boson coupled systems.
• This work paves the way for practical applications of quantum sensing.