Tootfinder

We've got buried treasure on view in a new display at the museum. Thanks to a recent gift and the work of a consultant and a staff member, we're displaying mingqi, or "spirit goods," in two adjoining cases in the permanent collection. Read on to learn more about how this grouping of well-preserved objects came together.

Save the date: 3./4. November in Köln
» Caring Communities «
"In welcher Gesellschaft wollen Sie, wollen wir leben? Wie kümmern wir uns künftig um die Schwerstkranken, die Sterbenden, die Trauernden und um uns selbst?"
➡️ https://caringcommunity-kongress.org/
In Köln is…

🇺🇦 #NowPlaying on KEXP's #VarietyMix
Crown Heights Affair:
🎵 Galaxy Of Love
#CrownHeightsAffair
https://samshelley.bandcamp.com/track/crown-heights-affair-galaxy-of-love-sam-shelley-re-edit
https://open.spotify.com/track/195mwsLM34pO9WOrA88mzt

Forbidden configurations for coherency
Victoria Gould, Marianne Johnson
https://arxiv.org/abs/2506.11321 https://arxiv.org/pdf/2506.1…

Forbidden configurations for coherency
Right (and left) coherency and right (and left) weak coherency are natural finitary conditions for monoids, however, determining whether a given monoid is right, or dually left, coherent turns out to be hard and disparate techniques have been developed to show that certain classes of monoids are (or are not) right coherent. We exhibit a particular configuration of elements in a monoid subsemigroup of a right (respectively, left) $E$-Ehresmann monoid, relative to the Ehresmann structure of the o…

Coherence monotones of quantum channels based on two generalized quantum relative entropies
Jiaorui Fan, Zhaoqi Wu, Shao-Ming Fei
https://arxiv.org/abs/2506.10810

Coherence monotones of quantum channels based on two generalized quantum relative entropies
By using the Choi-Jamiołkowski isomorphism, we propose two classes of coherence monotones of quantum channels based on the unified $(r,s)$-relative entropy and the sandwiched Rényi relative entropy. Elegant properties of the coherence monotones for quantum channels are explored. Moreover, we present the upper bounds of the coherence monotones and derive the explicit formulas of the coherence monotones for qubit unitary channels.

Trump and his allies wasted little time in branding the people protesting against immigration enforcement raids in Los Angeles as “insurrectionists”.
Stephen Miller, the White House deputy chief of staff for policy
– particularly the vindictive kind
– spoke darkly of a “violent insurrection”.
JD Vance, the vice-president, inveighed against “insurrectionists carrying foreign flags” on the streets of the nation’s second-biggest city.
It didn’t escape notice that …

No Kings protests Bay Area: Tens of thousands flooded S.F. Civic Center (San Francisco Chronicle)
https://www.sfchronicle.com/bayarea/article/no-kings-protest-updates-20373171.php
http://www.memeorandum.com/250615/p8#a250615p8

Quantum Resource Complementarity in Finite-Dimensional Systems
Justin K. Edmondson
https://arxiv.org/abs/2506.11741 https://arxiv.org…

Quantum Resource Complementarity in Finite-Dimensional Systems
Quantum resources such as entanglement, information redundancy, and coherence enable revolutionary advantages but obey fundamental tradeoffs. We present a unified geometric constraint governing three core operational tasks: teleportation ($q_1$), cloning ($q_2$), and coherence-based metrology ($q_3$). For any tripartite quantum state $ρ_{ABC}$, we show the tight inequality $q_1^2 + q_2^2 + q_3^2 \leq 1$ confines all physically achievable resources to the positive octant of the unit ball. This …

Quantifying coherence of quantum channels based on the generalized $\alpha$-$z$-relative R\'{e}nyi entropy
Jiaorui Fan, Zhaoqi Wu, Shao-Ming Fei
https://arxiv.org/abs/2506.10796

Quantifying coherence of quantum channels based on the generalized $α$-$z$-relative Rényi entropy
By using the Choi-Jamiołkowski isomorphism, we propose a well-defined coherence measure of quantum channels based on the generalized $α$-$z$-relative Rényi entropy. In addition, we present an alternative coherence measure of quantum channels by quantifying the commutativity between the channels and the completely dephasing channels with the generalized $α$-$z$-relative Rényi entropy. Some elegant properties of the measures are illustrated in detail. Explicit formulas of these coherence mea…