Microwave Electrometry with Quantum-Limited Resolutions in a Rydberg-Atom Array

Area of Science:

• Quantum physics and metrology
• Electromagnetics and sensing technology
• Atomic physics and optical systems

Background:

• Classical microwave (MW) field sensing faces limitations in resolution and speed due to fundamental physical constraints.
• Existing antenna technologies struggle to achieve quantum-limited sensitivity and high spatial resolution simultaneously.
• Advancements in quantum sensing are crucial for pushing the boundaries of electromagnetic field measurement.

Purpose of the Study:

• To demonstrate a novel microwave electrometry system that overcomes the limitations of classical sensing.
• To utilize individual Rydberg atoms in optical tweezer arrays as highly sensitive and precise field sensors.
• To achieve quantum-limited sensitivity, ultra-fast response times, and submicrometer spatial resolution in MW field sensing.

Main Methods:

• Employing individual Rydberg atoms, prepared in optical tweezer arrays, as coherent sensors for microwave fields.
• Utilizing the quantum properties of Rydberg atoms to achieve enhanced field sensitivity and temporal response.
• Implementing in situ near-field mapping techniques with Rydberg atoms for high spatial resolution.

Main Results:

• Achieved a microwave field sensitivity within 1.0 dB (13%) of the standard quantum limit.
• Demonstrated a response time exceeding the Chu limit by over 11 orders of magnitude.
• Obtained submicrometer spatial resolution (λ/3000) for in situ near-field electromagnetic field mapping.

Conclusions:

• Rydberg atom arrays provide a powerful platform for advanced microwave electrometry.
• This approach unites quantum-limited sensitivity, nanosecond-scale response times, and submicrometer resolution.
• Opens new possibilities in quantum metrology and high-resolution electromagnetic field imaging.