Squeezed Phonon States: Modulating Quantum Fluctuations of Atomic Displacements

TL;DR

This paper explores the generation and detection of squeezed phonon states, which can reduce quantum noise in atomic displacements, using phonon-phonon interactions and reflectivity measurements.

Contribution

It introduces a method to generate squeezed phonon states via three-phonon parametric amplification and proposes a detection scheme based on reflectivity measurements.

Findings

Demonstrated the possibility of modulating quantum fluctuations below zero-point noise.

Calculated expectation values and fluctuations of atomic displacement and lattice amplitude.

Proposed a feasible detection scheme for squeezed phonon states.

Abstract

We study squeezed quantum states of phonons, which allow the possibility of modulating the quantum fluctuations of atomic displacements below the zero-point quantum noise level of coherent phonon states. We calculate the corresponding expectation values and fluctuations of both the atomic displacement and the lattice amplitude operators, and also investigate the possibility of generating squeezed phonon states using a three-phonon parametric amplification process based on phonon-phonon interactions. Furthermore, we also propose a detection scheme based on reflectivity measurements.