Erratum: “Two and three particles interacting in a one-dimensional trap” [Am. J. Phys. 85, 769 (2017)]

In our paper,¹ we used two different dimensionless interaction constants g₀ and $g ho$⁠. They are related to one another (see just below Eq. (25) in the original paper) by $g ho / g 0 = π / ( 2 ρ )$⁠, where $ρ ≡ E 1 / ( ℏ ω )$ relates the infinite square well energy scale to the harmonic oscillator energy scale. We inadvertently used the wrong labels in Figs. 1–4. In these figures, all occurrences of g₀ should be replaced by g_ho. To relate the two, use ρ = 1 in Figs. 1 and 2, and ρ = 50 remains for Figs. 3 and 4.

The matlab codes in the supplementary material are standalone. For simplicity, the code uses g₀ where the harmonic oscillator is not involved (and, therefore, we have replaced ifs_only_dirac_dist.m and ifs_only_dirac_bos.m),² reflecting Eq. (12). For the cases where the harmonic oscillator basis is used and the harmonic oscillator potential is embedded in the infinite square well potential, g_ho is used.

This mislabelling does not affect our qualitative results in any way but does adjust the scale of coupling strengths by a numerical factor. We wish to thank Paul Coones for alerting us to this error.