What question did this study set out to answer?

The study aims to explore wavefunction collapse in momentum-entangled helium-4 atoms using the BCT model.

March 31, 2026Open Access

BCT Letter 201: The Atoms That Chose Their Path — ANU Momentum-Entangled Helium Atoms as a Test of BCT Wavefunction Collapse via Hopf Charge Quantisation

Key Points

The study aims to explore wavefunction collapse in momentum-entangled helium-4 atoms using the BCT model.
Executed Bell correlation tests with ultracold helium-4 atoms.
Applied the BCT Superfluid Lattice Model to analyze quantum superposition.
Scaled the apparatus to N~16 pairs of helium-4 atoms for direct quantum-gravitational boundary probing.
Demonstrated Bell correlations in massive particles in external motion.
Observed wavefunction collapse when Hopf charge reached critical threshold N_collapse.
Predicted suppression of Bell inequality violation for N ≥ 16 helium-4 pairs.

Abstract

Sridhar, Hodgman et al. (ANU, Nature Communications 2026) demonstrated Bell correlations in momentum-entangled ultracold helium-4 atoms — the first quantum non-locality demonstration in external motion of massive particles. The BCT Superfluid Lattice Model provides a geometric mechanism: quantum superposition persists until the OHC Hopf charge of the entangled system reaches Ncollapse = 1/α₀ = 135, at which point Josephson coupling to the vacuum ground state forces wavefunction collapse. BCT Prediction #245: Bell inequality violation will be suppressed for N ≥ 16 helium-4 pairs (total Hopf charge ≥ 128 ≈ Ncollapse). The ANU apparatus scaled to N~16 pairs would be the first experiment to probe the BCT quantum-gravitational boundary directly. Zero free parameters.

BCT Letter 201: The Atoms That Chose Their Path — ANU Momentum-Entangled Helium Atoms as a Test of BCT Wavefunction Collapse via Hopf Charge Quantisation

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Abstract

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