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Gradient Echo Quantum Memory in Warm Atomic Vapor

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Published on: November 12, 2013

Single-ion quantum lock-in amplifier.

Shlomi Kotler¹, Nitzan Akerman, Yinnon Glickman

¹Department of Physics of Complex Systems, Weizmann Institute of Science, PO Box 26, Rehovot 76100, Israel. shlomi.kotler@weizmann.ac.il

|May 6, 2011

Summary

This summary is machine-generated.

Researchers developed a quantum lock-in amplifier using a single ion. This quantum sensor significantly boosts measurement sensitivity and extends coherence times for advanced quantum metrology applications.

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Area of Science:

Quantum Information Science
Atomic Physics
Quantum Metrology

Background:

Classical lock-in amplifiers enhance signal-to-noise ratios by spectrally separating signals from noise.
Improving measurement sensitivity in quantum systems often conflicts with reducing noise susceptibility.

Purpose of the Study:

To implement a quantum analogue of the classical lock-in amplifier.
To enhance the sensitivity and phase coherence of quantum sensors.

Main Methods:

Utilized non-commuting quantum operators on a single, trapped Strontium-88 ion's electronic spin state.
Performed modulation, detection, and mixing operations using quantum principles.

Main Results:

Achieved a three-orders-of-magnitude increase in phase coherence, exceeding one second.
Demonstrated frequency shift sensitivity of 0.42 Hz/Hz^(1/2), equivalent to 15 pT/Hz^(1/2) magnetic field sensitivity.
Obtained measurement uncertainty below 10 mHz (350 fT) after averaging.

Conclusions:

The quantum lock-in technique significantly enhances quantum sensor sensitivity, surpassing existing single-spin probe technologies by two orders of magnitude.
The demonstrated sensitivity is sufficient for applications like measuring parity non-conservation and detecting single electronic spin magnetic fields.
The quantum lock-in technique is a versatile method with potential to improve sensitivity across various quantum sensing modalities.