Quantum supremacy – or not?

Google recently published a paper in Nature entitled “Quantum supremacy using a programmable superconducting processor.” They claim to have used 53 qubits to solve a task that would take about 10,000 years on a classical supercomputer.

Some caution seems necessary in interpreting this claim, however. First, it does not refer to any of the practical tasks that people would like quantum computers to solve. And second, IBM claims that 2.5 days is a more realistic estimate for the time required on a classical supercomputer. It does seem that “quantum supremacy” is not quite here yet (see also what Scott Aaronson has to say).

Photo: IBM 50-qubit quantum computer (credit: Ian Hughes, 2018)

And returning him safely to the earth

In 1961, John F. Kennedy told Congress: “I believe that this nation should commit itself to achieving the goal, before this decade is out, of landing a man on the moon and returning him safely to the earth.

The Moon landing on 20 July 1969 achieved the first part of that goal. The second part was yet to come (in 1970, that would prove to be the hard part).

But on 21 July 1969, at 17:54 UTC, the spacecraft Eagle lifted its metaphorical wings and took off from the Moon (well, the upper ascent stage took off, as shown in the photograph below). There followed a rendezvous with Columbia, a flight back to Earth, and an eventual splashdown on 24 July. Mission accomplished.

The Eagle has landed!

Fifty years ago, on 20 July 1969, at 20:17:40 UTC, the spaceship Eagle landed on the Moon. Here is the landing site – below, as it was, and above, as seen by the Lunar Reconnaissance Orbiter Camera (LROC). Clearly visible in the LROC image, and illustrated with inset photographs from 1969, are:

A tale of two arrivals

Fifty years ago, on 19 July 1969, the spaceship duo Columbia / Eagle entered orbit around the Moon, roughly 3 days and 4 hours after its launch, as part of the Apollo 11 mission. Eagle (with Neil Armstrong and Buzz Aldrin) went on the land on the moon on 20 July while Columbia (with Michael Collins) continued to orbit the moon. When he announced the space programme, Kennedy had said:

We choose to go to the moon. We choose to go to the moon in this decade and do the other things, not because they are easy, but because they are hard, because that goal will serve to organize and measure the best of our energies and skills, because that challenge is one that we are willing to accept, one we are unwilling to postpone, and one which we intend to win, and the others, too.

Much can be learned from doing hard things, and an enormous amount was learned from the space programme. Solar car teams also learn a great deal from doing hard things. Fifty years after Columbia and Eagle entered orbit, also after hard effort, the University of Michigan Solar Team’s solar car Electrum arrived in public view (at 17:30 Michigan time). They intend to win too!

A tale of two launches

Fifty years ago, on 16 July 1969, a Saturn V rocket carrying three men (Neil Armstrong, Buzz Aldrin, and Michael Collins), plus the command module Columbia, and the lunar module Eagle, took off from Florida, en route to the first human landing on the moon (above).

Fifty years later, the Dutch Vattenfall Solar Team launched their 10th solar car, Nuna X (below). Catamaran-style solar cars seem to have reached an optimum: the front of Nuna X looks a lot like Nuna 9 and the rear looks a little like Twente’s Red E and Agoria’s Punch 2 – but only on the left side! The new car weighs just 135 kg (298 lbs), which is probably the lightest ever solar car. I think that Twente, Agoria, and everybody else will have their work cut out trying to outrace this latest car from Delft!


The 2019 Eurovision Song Contest is on right now. Above (click to zoom) is a combined word cloud for the songs (or English translations of the songs).

From the point of view of getting into the final, it seems to be bad to sing about Heaven (Montenegro, Portugal), war (Croatia, Finland), cell phones (Belgium, Portugal), or cold (Latvia, Poland, Romania). On the other hand, it’s good to sing about lights (Germany, Norway, Sweden).

Good luck to everyone for the final!

International Nurses Day

Sunday (May 12) is International Nurses Day, a day which marks the contributions that nurses make all around the world. The day is in fact the birthday of Florence Nightingale, who was a pioneer nurse as well as a pioneer of medical statistics. Nurses are multi-talented!

Thank you, all you nurses, for your contributions to the world!