Ultra-strong Quantum Squeezing Mediated by Plasma Waves

TL;DR

This paper demonstrates that plasma waves can mediate ultra-strong quantum squeezing via stimulated Raman scattering, enabling high photon number squeezed states with remarkable thermal noise tolerance, surpassing conventional solid-state limits.

Contribution

It introduces a plasma-based method for ultra-strong quantum squeezing using high-intensity lasers, surpassing traditional solid-state media limitations.

Findings

Achieved up to ultrastrong squeezing with $10^{16} Wcm^{-2}$ pump lasers.

Generated quantum-correlated photon pairs via phonon-mediated four-wave mixing.

Demonstrated high thermal noise tolerance in plasma-mediated squeezing.

Abstract

Quantum squeezed states enable precision measurements beyond the standard quantum limit, but conventional solid-state media fundamentally limit pump intensities to the ionization threshold. We demonstrate that plasma waves can mediate ultra-strong two-mode squeezing through stimulated Raman scattering, achieving up to ultrastrong squeezing using $10^{16}{Wcm^{-2}}$ pump lasers. Employing two copropagating pump beams with frequency difference matching twice the plasma frequency, we generate quantum-correlated photon pairs through phonon-mediated four-wave mixing. The process exhibits remarkable thermal noise tolerance, allowing strong squeezing even with large thermal phonon numbers. This plasma-based approach produces squeezed states with ultrahigh photon numbers, opening new possibilities for strong-field applications across optical to X-ray wavelengths.