‘Don’t go to the US – not with Trump in charge’: the UK tourist with a valid visa detained by ICE for six weeks Karen Newton was in America on the trip of a lifetime when she was shackled, transported and held for weeks on end. With tourism to the US under increasing strain, she says, ‘If it can happen to me, i...

Scientific conferences must not be held in the US until it is safe to travel there.

www.theguardian.com/us-news/2026...

We're a group of fun, loving, and fun-loving people welcoming more :)

Appreciate the gracious invitation and a wonderful conference!

Efficiently computing the Uhlmann fidelity for density matrices We consider the problem of efficiently computing the Uhlmann fidelity in the case when explicit density matrix descriptions are available. We derive an alternative formula which is simpler to evaluate...

The fidelity

F(ρ,σ) = tr[√(√(ρ)σ√(ρ))] = ||√(ρ)√(σ)||_1

of two quantum states ρ and σ can also be expressed as

F(ρ,σ) = tr(√(ρσ)).

Not sure how well-known this is! It is proved in arxiv.org/abs/2211.02623 (or the older arxiv.org/abs/1503.00304).

When in Canada, use a hockey stick! @markwilde.bsky.social delivers his talk on quantum hypothesis exclusion at the Perimeter Institute with a true Canadian twist 🏒