last week i was in leiden, attending a workshop on post-quantum crytpography and quantum algorithms at the lorentz center. it was a collection of talks and working in smaller groups, where we discussed certain topics, such as quantum attacks on ideal lattices in more detail, trying to find a way to use quantum computers to speed up attacks against primitives of post-quantum cryptography. as this is somewhat close to my research – i work on analyzing a quantum algorithm with pawel wocjan and am working on lattices and lattice reductions – i was very happy to attend this meeting. especially since there were not just some mathematicians, but also a lot of experts on various aspect of quantum computers and quantum algorithms. now i also know a lot more about quantum computing, both from the theoretical side – like having been explained grover’s algorithm, which is another of the fundamental quantum algorithms next to the period-finding algorithm family starting with shor’s algorithm – and the practical side – what the current technology with regard to building quantum computers is, and how people writing compilers for quantum computers can suffer and how complicated it can be to turn a “simple” algorithm into a circuit. i think this was one of the most productive workshops i’ve ever attended.
unfortunately, i neither took my camera with me (the little one i had with me last week, since it is somewhat broken (the sd card slot won’t keep the card anymore, similar to what is described here), nor did i really had time to take any pictures, as i spend most awake hours doing mathematics. i took a few shots with my mobile phone on the excursion/conference dinner on wednesday, which happend to be on a boat going through grachten around leiden and the city and also happened to be a very decicious and very spicy asian food buffet. and later, there was a great dessert buffet. one of the best and original conference dinners i had for quite some time :)

this week, i was attending a conference on monte verità in ticino.

ascona.

on tuesday we shifted the afternoon lectures by two hours to be able to exploit the great weather to visit ascona:

bellinzona.

on wednesday, we went on an excursion to bellinzona. unfortunately, the weather was not so great. we began with a tour through castelgrande and continued with a short city tour. here are some impressions:

last weekend we travelled to dresden. with perfect weather, we (re-)explored the city and parts of the sächsische schweiz. we first started with a hop-on/hop-off sightseeing tour which led us among other things to the blue wonder, schwebebahn dresden, the funicular railway, the “balcony of dresden” (luisenhof), the dresden-neustadt station’s entrance hall and the “toilet cinema”. some impressions from these places can be seen below:

here are also some shots from during the night, mainly showing dresden downtown:

finally, we did an excursion to the sächsische schweiz, namely to the bastei and the adjacent neurathen castle. from there, we descended down to rathen and took a paddle wheeler from there back to dresden. here are some impressions. (you can see “our” paddle wheeler in the photos above, it was the “pillnitz”.)

as you can see, we had a great time with perfect weather. most of the time during the excursion, there wasn’t a single cloud on the sky!

yesterday we were on an excursion, which led us from our home to some nice places between lake constance and schaffhausen with a final stop in baden before we returned home.

we first traveled to tägerwilen to look at a small design settlement with eight houses, where different materials were used. unfortunately, the weather wasn’t very great at that point, and it was not very easy to take good pictures there anyway… afterwards, we walked over to gottlieben and waited for our boat.

we traveled by boat on lake constance and the rhine to schaffhausen. the weather was still not great, it was cloudy, but at least it wasn’t raining. when approaching schaffhausen, the clouds started to rip apart.

in schaffhausen, the clouds began to clear up. we explored the old town a bit.

finally, we walked up to the munot, a fortification built during the 16th century. from there we had a great view – some of the above photos were taken from there or from the way up/down.

finally, we proceeded by train to waldshut to drink coffee, and continued by train to baden to eat dinner. at least, that was what we planned to do in baden. turns out that the city center is essentially dead from 6 pm on, except fast food “restaurants” or pubs. we had to walk quite some distance outside of the city center to find something to eat; we ended up in an italian restaurant chain near the kantonsschule. on the way back, two of us who had to travel westwards wanted to take bus 3, which would have allowed them to arrive home earlier than if they would take the later bus which would be perfect for us. bus 3 is supposed to leave at the same stop. unfortunately, unknown to us and also to google maps, apple maps, map.search.ch etc., there are two stops called “kantonsschule”. at the time we located the second stop on a map, their bus was already gone… really great. anyway, we eventually got back to the main station, and were able to depart in direction of our beds after this long day…

yesterday, when the weather was surprisingly beautiful, we were outside. me, mostly hanging around with my telephoto lens, watching the kittens play, hide, and explore.

later, on the inside, i took some photos of the older cats as well, while they were waiting for food:

they had to wait a bit longer. first, we did some cooking: a vegetarian zürcher geschnetzeltes (based on dinki) with rösti. won’t be the last time we had that :)