Generalizing primordial gravitational waves to a three-mode Bogoliubov transformation yields classical behavior via quantum discord for large squeeze parameters when only two of three modes are considered, while the quantum Poincare sphere shows non-classicality for positive squeeze or nonzero cosθ,
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Non-classicality of Primordial Gravitational Waves in Three-mode Representation Through Quantum Poincare Sphere
Generalizing primordial gravitational waves to a three-mode Bogoliubov transformation yields classical behavior via quantum discord for large squeeze parameters when only two of three modes are considered, while the quantum Poincare sphere shows non-classicality for positive squeeze or nonzero cosθ,