Enhancing Dynamic Range of Sub-Standard-Quantum-Limit Measurements via Quantum Deamplification

Area of Science:

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

Background:

• Achieving high sensitivity and broad dynamic range simultaneously is a key challenge in measurement science.
• Traditional quantum metrology often sacrifices dynamic range for enhanced sensitivity.
• Applications like atomic clocks require a large dynamic range for extended phase interrogation.

Purpose of the Study:

• To introduce a novel quantum deamplification mechanism for extending dynamic range in quantum metrology.
• To achieve extended dynamic range with minimal compromise to measurement sensitivity.
• To provide a scalable and noise-resilient pathway for entanglement-enhanced metrology.

Main Methods:

• Utilizing two sequential spin-squeezing operations to generate and detect an entangled probe state.
• Employing two-axis countertwisting dynamics to approach the optimal quantum interferometer limit.
• Implementing sequential quantum deamplification interspersed with phase encoding for further dynamic range expansion.

Main Results:

• Demonstrated a quantum deamplification mechanism that significantly extends dynamic range.
• Showcased that the optimal quantum interferometer limit can be approached via specific dynamics.
• Proposed a hybrid sensing scheme combining quantum deamplification and amplification for enhanced noise robustness.

Conclusions:

• The developed quantum deamplification protocol offers a scalable pathway for entanglement-enhanced metrology.
• The technique is compatible with state-of-the-art atomic-molecular-optical platforms.
• This approach provides a noise-resilient method for improving measurement capabilities in sensitive applications.