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Implementation of a Reference Interferometer for Nanodetection

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Ultrasensitive two-mode interferometry with single-mode number squeezing.

Luca Pezzé¹, Augusto Smerzi

¹QSTAR, INO-CNR and LENS, Largo Enrico Fermi 2, 50125 Firenze, Italy.

Physical Review Letters

|May 18, 2013

Summary

This study introduces a novel method to enhance interferometer sensitivity beyond the shot-noise limit using particle-entangled states. The technique involves manipulating population fluctuations for improved phase estimation, achieving significant gains even with single-particle inputs.

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Area of Science:

Quantum optics
Quantum metrology

Background:

A key challenge in phase estimation is creating high-intensity entangled probe states.
Enhancing the sensitivity of two-mode interferometers beyond the standard quantum limit (shot-noise limit) is crucial for precision measurements.

Purpose of the Study:

To demonstrate a method for significantly enhancing interferometer sensitivity above the shot-noise limit.
To introduce a novel class of particle-entangled states for improved phase estimation.

Main Methods:

Squeezing the population fluctuations of a single input mode.
Measuring these fluctuations at the output of a two-mode interferometer.
Utilizing arbitrary non-vacuum states (e.g., coherent states) for the second input mode.

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Main Results:

Achieved a 2.4 dB gain above the shot-noise limit with a single-particle Fock state injection.
Demonstrated a novel class of particle-entangled states that are not spin squeezed.
Showcased the potential for reaching the Heisenberg limit with larger particle numbers and squeezed states.

Conclusions:

The proposed method effectively enhances interferometer sensitivity beyond the shot-noise limit.
This technique offers a pathway to higher precision phase estimation using particle-entangled states.
The protocol shows robustness against detection noise, indicating practical applicability.