Spin-exchange collisions in hot vapors create and sustain bipartite entanglement

Abstract

Spin-exchange collisions in alkali or alkali/noble gas vapors are at the basis of quantum sensing, nucleon structure studies, tests of fundamental symmetries, and medical imaging. We here show that spin-exchange collisions in hot alkali vapors naturally produce strong bipartite entanglement, which we explicitly quantify using the tools of quantum information science. This entanglement is shown to have a lifetime at least as long as the spin-exchange relaxation time, and to directly affect measurable spin noise observables. This is a formal theoretical demonstration that a hot and dense atomic vapor can support longlived bipartite and possibly higher-order entanglement.

arXiv comment5 pages, 2 figures

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Cited by in corpus (11)

• Strong coupling of alkali spins to noble-gas spins with hour-long coherence time
• Inter-species spin-noise correlations in hot atomic vapors
• Critical dynamics and phase transition of a strongly interacting warm spin-gas
• Spin noise spectroscopy of an alignment-based atomic magnetometer
• Collision-induced spin noise
• Quantum thermodynamic derivation of the energy resolution limit in magnetometry
• Anomalous noise spectra in a spin-exchange-relaxation-free alkali-metal vapor
• Zero-field spin noise spectrum of an alkali vapor with strong spin-exchange coupling
• Magnetic-field-independent spin-exchange relaxation-free magnetometer
• Anomalous high-density spin noise in a strongly interacting atomic vapor
• Optical protection of alkali-metal atoms from spin relaxation