Atomic Interferometry with Spin-Orbit-Coupled Spin-1 Condensates

TL;DR

This paper proposes a quantum interferometry scheme using spin-orbit-coupled Bose gases, enabling enhanced sensitivity and novel phase readout methods through controllable spin-mixing and spatial density modulations.

Contribution

It introduces a new interferometry approach with tunable spin-mixing and spatial readout in Raman-dressed spinor condensates, surpassing standard quantum limits.

Findings

Entanglement generation in critical regimes enhances sensitivity.

Spatial density modulations allow phase readout independent of spin observables.

Effective time reversal enables echo-type protocols for improved interferometry.

Abstract

We propose and analyze a quantum interferometry scheme based on a Raman-dressed Bose gas with spin-orbit coupling. In this system, the atom-light coupling mixes spin and momentum degrees of freedom, giving rise, in the low-energy regime, to an effective spinor condensate whose spin-mixing interaction can be tuned independently of the atomic density. This controllability enables a separation between state preparation and phase imprinting, and provides a natural route to echo-type protocols based on effective time reversal. Within this framework, critical regimes of the effective spinor Hamiltonian can be used to generate entanglement and enhance interferometric sensitivity beyond the standard quantum limit. In addition, the spin-momentum locking of the dressed modes gives access to spatial density modulations that provide an alternative readout of the interferometric phase. In particular, phase information can be extracted from the displacement of spin-orbit-induced density stripes even when conventional spin observables are insensitive within the effective spinor description. Our results identify Raman-dressed spinor gases as a flexible platform for nonlinear atomic interferometry, combining controllable spin-mixing dynamics with spatially resolved phase readout.