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Quantum metrology with a scanning probe atom interferometer.

Caspar F Ockeloen¹, Roman Schmied, Max F Riedel

¹Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland.

Physical Review Letters

|October 22, 2013

Summary

This summary is machine-generated.

Researchers developed a quantum sensor using entangled atoms to map microwave fields with micrometer resolution. This atom chip interferometer surpasses the standard quantum limit, achieving high sensitivity for quantum information processing applications.

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Area of Science:

Quantum physics
Atomic physics
Metrology

Background:

Microwave field mapping is crucial for developing advanced technologies.
Existing methods often lack the required spatial resolution.
Quantum phenomena offer potential for enhanced measurement precision.

Purpose of the Study:

To develop a high-resolution probe for mapping microwave fields.
To utilize quantum entanglement for improved interferometric sensitivity.
To demonstrate the application of quantum metrology in microscale field sensing.

Main Methods:

Employing a Bose-Einstein condensate on an atom chip as an interferometric probe.
Utilizing atomic entanglement to enhance interferometer performance beyond the standard quantum limit.
Scanning the probe to map microwave fields with micrometer resolution.

Main Results:

Achieved a 4 dB improvement over the standard quantum limit using atomic entanglement.
Demonstrated enhanced performance for interrogation times up to 10 ms.
Obtained a microwave magnetic field sensitivity of 77 pT/√Hz in a 20 μm³ probe volume.

Conclusions:

Quantum metrology with entangled atoms enables high-spatial-resolution measurements.
The developed technique is suitable for probing limited atom numbers in small volumes.
This method is vital for advancing integrated microwave circuits and quantum information technologies.