Weblog Yuli Nazarov
Stevan Nadj-Perge
born in Kikinda, Serbia, has secured his Ph.D. title yesterday.
The promotor was Leo Kouwenhoven. The back side of the thesis showed a quantum yo-yo, an indespensible component of quantum calculations. The title of the thesis was “Single Spins in Semiconductor Nanowires”
During the event, the “dark years” have been mentioned many times: 2,5 years Stevan has spent in clean room trying to fabricate, for no avail. The sucsess has come relatively recently, and the thesis contains several important achivements, including of course the “Disentangling”, the topic we have collaborated on.
Good luck, Stevan, with futher carrier. Many remember your perfect smile that persisted even during “dark years”. I was impressed with your propositions: they were so correctly unpractical or, to formulate it better, so unpractically correct. I could sign every of them, provided I’m a bit yonger and can afford being unpractical.
St. Nicholas day
is today (according to our Church calendar).
St. Nicholas is patron saint of Amsterdam and Russia, so naturally our parish is the St. Nicholas parish. There must be a big feast over there today. We wished to attend this, but we cannot: 10 cm snow has fallen tonight, and public transportation does not like this. A bit dissapointed, we celebrate at home.
This is the name day of my handicapped son, who will turn seventeen soon. This is also the name day of an old Russian surgeon who has saved life of my wife about thirty years ago.
Holy father Nicholas, defender and wonderworker, recall them and all us seeking your help in your prayers.
Matti Laakso
my Finnish collaborator, was visiting Delft in the week past. Unfortunately, it was rather busy and chaotic week and I cannot work with him as much as I wanted. Still, we were able to achieve some serious progress regarging the processes that determine overheating in superconductor-insulator-normal metal-insulator-superconductor structures (SINIS, it only sounds that long and artificial, it fact, this is a very natural structure and is relatively easy to make).
Matti is going to complete his PhD thesis in coming year.
On his way back, he had a mixture of trouble and luck. There was again a snowfall on Friday, and again the transport managers have been caught unguarded (what is going on with this country anyway…) Three thousand people have been stranded at Schiphol airport, and estimated three thousand could not reach it at all. On this background, Matti was relatively fortunate. He’s only spent an hour in a train that has stuck in Schiphol tunnel, waited three extra hours for his flight (the only one within Europe that has not been cancelled) and managed to get home on the same night.
So I wish him best luck with his PhD thesis as well.
Roma, citta di eterno amore
I’ve promised a nice trip to my mother on occasion of her birthday. That should have happen in April, but the volcano has cancelled our trip. So this was a second attempt.
In the beginning, it was not better than the first one. We were to depart on Saturday Dec. 4, and there was a catastrophy: a snowfall. Notwithstanding the fact that such phenomena occur in this country with strange regularity, nobody seemed to be expecting this. The public transportation was paralyzed. Our train trip to Schiphol took three hours. It could take five, but we took a taxi cab from Amsterdam Zuid. With a great moral and financial effort, we have arrived on time for our flight. Our happiness did not last long: the flight has been cancelled, nobody could overbook it and nobody could even free our laggage trapped in Schiphol catacombs. To make a long story short, we have arrived to the Eternal city only on Sunday 23:55, to learn that there are no regular ways to leave the airport that late…
Anyway, we had Monday, Tuesday and most of Wednesday to enjoy Roma. It was warm and reasonably dry. Since my mother was there for the first time, we did all usual touristic things like jumping over stones of Forum, queuing to St. Peter’s cathedral, rushing through Borghese gallery. Less touristic things included the visit to Sancta Sanctorum where I contributed to polishing of Scala Santa with my knees, and unplanned encounter with the Pope on piazza Spagna on occasion of the feast of Immaculate Conception (being Orthodox, we were not even aware of the feast).
The way back was not trivial either. It looks like if one takes a taxi in the beginning of the trip, one keeps taking it till the end, and missed trains and trams just provide a good excuse to enjoy this kind of transportation.
Visit NEC Tsukuba
I reserved a day, my last day in Japan, to visit NEC Tsukuba, were Jaw-Shen Tsai, Yasunobu Nakamura, Yuri Pashkin and Oleg Astafiev do almost unbelivable things about quantum manipulation. Their (pioneering) works with qubits are well-known, now in addition to it they do nanomechanics, non-linear quantum optics with microwaves and always eager to talk about new things, like phase-slips etc.
I was trying to promote the phase-slips in my talk but they’ve already did some preliminary experiments and were dissappointed. Perhaps Oleg will be able to combat this feeling. Anyway, there were more than many discussion topics, and I’ve spent the whole day talking
We’ve rounded the day with a nice party: thanks so much, my hosts.
Good time at NTT
It is more than a week I am back from NTT. It was a very good visit, both productive and informative. Here are some highlights.
With Yasuhiro Tokura, we have started collaboration on nuclear punping effects on transport in quantum dots. With Toshihiro Kubo, we have started collaboration on mesoscopic interference effects in two quantum dots. I hope very much we can bring these challenging and interesting projects to the end.
Makoto Yamashita has explained me his research in cold atoms, in particular, his studies of Bose shells. Tetsuya Mukai has shared his ideas of atom chip where several atoms are trapped above the surface of a superconductor with magnetic field of superconducting currents.
I listened to the talk of Fumiki Yoshihara from NEC Tsukuba: he presented a long-awaited experimental charactetization of flux noise in superconducting qubits. The noise seems to come from the surface. Hayato Nakano gave a detailed review of his work on “practical” measurement, theoretical research on details of collective quantum mechanics of a qubit and a detector.
Hiroshi Yamaguchi has open me new horizons in nanomechanics: he has original thoughts and plans that differ from those I accustom to. How about a computer solely based on non-linearities of nanomechanical resonators?
Many if not most discussions have been with Koji Muraki, the head of quantum dot group, his students and postdocs. I have learned about the gap at nu=2/5, was updated on charge qubits, charge measurement, exotic Kondo and, of course, on nuclear pumping effects. Here, I guess, Tokura and me were able to contribute to understanding of the experiment
Michael Tinkham
is not with us anymore. This has happened two weeks ago, but I’ve learned about it only today. He was 82, and our last scientific communication was less than four years ago.
Michael Tinkham was not just a classic writer and pioneer of the superconductivity: for me, it was like the superconductivity itself. His ability to comphrehend the things about it, and his taste for novelty and unusual аspects of physical phenomena were almost beyond imagination. In his advanced ages, he looked nothing like a monument to his own merits: rather, he acted as a person in very beginning of his scientific carrier, looking for news and being eager to learn.
Our last communication was about quantum phase slips: he wanted to achieve an unambiguous experimental proof of their existence.
Grant rest, o Lord, to the soul of Thy servant Michael.
Nuclear spin pumping and electron spin susceptibilities
was a topic of our deep considerations with Jeroen Danon. These considerations have started when Jeroen was a second-year ph.d. student, and now, as Jeroen is already more than a year in Berlin, finally converged to a form of a paper submitted. You can find it here.
Hakone
Tokura-sensei was so kind as to drive me and Kubo-san to Hakone on Saturday, Nov. 13. Hakone (箱根 ) is a mountainous area west of Atsugi. Hakone checkpoint used to protect the only pass connecting Kyoto and Tokyo plain areas. Hakone houses many hot spring resorts, offers astonishing views of lakes and mountains, Fuji-yama included, and is a popular destination for domestic and foreign tourists.
So we hiked over mountain trails that were enhanced with bamboo trunks but did not get any easier. We smelled sulfur of volcanic vapour. We got into unearthy valley of Owakudani where smoke, hot water and heat come from the ground. We ate famous black eggs cooked in sulfur-reach naturally-boiling water. We took a cable car to get the views of Fuji and the lake Ani. We ate observing lavish pirate ships that cruised the lake. We took a good stroll along the lake shore.
It was a wonderful day, I am thankful for that.
O-yama and Shonan
This is a report of my activities in the weekend 6-7 november. I found myself in a semi-urban- semi-rural area of far Tokyo suburbs that spread tens of kilometers in any direction. The area is pleasantly exotic and convenient (you kind of cannot get lost in mountain taiga), so eventualy I opted for long walks.
My Saturday destination was O-yama, 大山, that is, “Big mountain”. Ten years ago I sucsessfully climbed it, and that was my intention for this time as well. However, I could not find the path I took ten years ago (they say it used to be female path to this holy mountain). I took the main path starting by the cable car station, male one, one who everybody takes. It was rather crowded. The path eventually consisted an ancient-looking stone stair that interrupted and changed directions randomly, following the slopes. After some time, I have reached lower shrine, at half-way climb, where everybody has been going. There was crowded, one can enjoy magnificient views of the valley below, or temples around. After resting a bit, I got a strange thought: perhaps, I do not have to get to the top at all. Perhaps, after tramping 17 kilometers of suburbs and hopping the stone stairs it won’t be such a joyful adventure. And I followed the thought. Getting wiser?
On Sunday I headed straight south. I seldom get to Pacific ocean and did not see it for ages. So it was 15 kilometer walk to Hiratsuka, to famous Shōnan (湘南 ) beaches. Several kilometers south to Atsugi I was able to get a glimpse of Fuji mountain, first time in my life. Hiratsuka appeared to be a nice and clean resort city, somehow resembling Schevingen. The beaches were good, also of Schevingen type. The difference was the sand color: volcanic activity in the area made it black. You guessed it correctly: it was rather crowded. People have been playing volleyball, fishing, some teenagers have been actively surfing ( ocean waves). Nobody swam, though the weather was fine and water did not feel too cold. So I also suppressed this natural desire (getting yet wiser?).