Farzin Salek
@fsalek.bsky.social
Quantum info fellow @Perimeter Institute
Reposted by Farzin Salek
We're a group of fun, loving, and fun-loving people welcoming more :)
November 7, 2025 at 3:45 PM
We're a group of fun, loving, and fun-loving people welcoming more :)
Reposted by Farzin Salek
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).
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).
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...
arxiv.org
March 14, 2025 at 2:34 PM
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).
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 🏒
January 17, 2025 at 8:12 PM
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 🏒