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Squeezing on Momentum States for Atom Interferometry.

Leonardo Salvi¹, Nicola Poli¹, Vladan Vuletić²

¹Dipartimento di Fisica e Astronomia and LENS-Università di Firenze, INFN-Sezione di Firenze, Via Sansone 1, 50019 Sesto Fiorentino, Italy.

Physical Review Letters

|February 6, 2018

Summary

This summary is machine-generated.

We developed a method to create squeezed atomic states for atom interferometers, improving phase estimation by 20 dB beyond the standard quantum limit. This technique enhances measurement precision for atomic motion.

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Area of Science:

Quantum optics
Atomic physics
Interferometry

Background:

Atom interferometers are sensitive measurement tools.
Current limitations exist in phase estimation precision, often bound by the standard quantum limit.
Squeezed states of atomic motion can potentially enhance interferometer sensitivity.

Purpose of the Study:

To propose and analyze a novel method for generating squeezed states of atomic center-of-mass motion.
To enable the injection of these squeezed states into atom interferometers for improved performance.
To investigate the applicability and scaling of this method for enhanced phase resolution.

Main Methods:

Utilizing dispersive probing in a ring resonator on a narrow atomic transition.
Implementing a collective measurement of the relative population of two momentum states.
Applying atomic transparency to extend the method to various diffraction orders and atom numbers.

Main Results:

Demonstrated applicability to Bragg diffraction-based strontium atom interferometers.
Achieved a phase resolution scaling of Δϕ∼N^{-3/4} for large atom numbers.
Showcased a potential 20 dB gain in interferometer phase estimation compared to the standard quantum limit.

Conclusions:

The proposed method effectively generates squeezed atomic states for atom interferometry.
This technique offers significant improvements in phase estimation resolution and precision.
The method is versatile and applicable to various atomic species with suitable narrow transitions.