Can we freeze something at room temperature? Yes, quantum coherence!

 

Happy 2017 from the Quanta Rei team! We close the current year with a guest post from our former member, long-time friend and collaborator Dr Rosario Lo Franco |RLF>

 

From the dawn of agriculture until the industrial revolution, all over the world, human beings have been facing the problem of food preservation. We are now quite familiar with many techniques, most of which utilised in our own kitchens, to reach this fundamental goal for our existence on Earth. Efficient and very employed procedures are, for instance: drying, salting, smoking, cooling and freezing. Let us focus on the last one, which works well for a very wide variety of foods. We are aware that, in order to preserve foods for long times by freezing, our freezers and refrigerators must be able to maintain temperatures well under zero Celsius degrees, typically −18° C or below (0° Fahrenheit or below). Air at the poles of our planet would be an extremely efficient freezer for foods, although it is not a very pleasant environment where to fig1icemanlive (the average temperatures at North Pole and South Pole are, respectively: 0° C (32° F) and −28.2° C (−18° F) during summer; −40° C (−40° F) and −60° C (−76° F) during winter). There is therefore a continuous technological development in engineering efficient and eco-friendly freezing machines to assure a trustable and lasting food preservation. If someone comes and tells us that it is possible to preserve food by freezing at room temperature we wold not believe them, unless we are in front of Marvel’s Iceman (see picture aside).

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Posted in Dancing quanta, Interference, Quantum foundations, Quantum research, Superposition | 1 Comment

Rise and fall of the Ice King

Few people might have heard about Frederic Tudor before, but sometime in the early 1800s this Bostonian whiz kid had an idea that changed the world for ever. As most life-changing ideas, this was simple, groundbreaking, and completely crazy.

When young Tudor visited the West Indies for the first time, he was delighted by the warm Caribbean weather. He may have been sunbathing or walking on the beach when the idea struck him like a lightning. It was a new business model, completely overlooked, and extremely profitable: Why not cut ice in Boston, ship it to the tropics and sell it to local restaurants? They could start selling chilled drinks, or even ice-cream. Most people there had never seen ice before. They would go crazy about it!

I can imagine young Tudor considering with excitement the feasibility of his idea. Ice was free. At least in Boston. And there was plenty. One only needed to cut it in blocks. Ships were affordable at the time and, to keep the ice from melting, one could insulate it with sawdust, which was also essentially free. Believe it or not, nobody had thought about large scale commercial ice ventures before. Back then, ice was only used in small quantities wherever it was naturally available. But the idea of getting people to actually pay for ice was simply revolutionary.

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Posted in Miscellanea, Thermodynamics | Leave a comment

Would you rather be monogamous or faithful?

“When two systems enter into temporary physical interaction due to known forces between them, and when after a time of mutual influence the systems
separate again, then they can no longer be described in the same way as before. I would not call that one but rather the characteristic trait of quantum mechanics,the one that enforces its entire departure from classic lines of thought. By the interaction the two systems have become entangled”
[E. Schroedinger, 1935]

Being a physicist or a mathematician and living in the normal world is not a simple task. This is not only about physical aspect, conventions, or appearances.

Posted in Entanglement, Quantum research, Science & Society | Leave a comment

Peering through the fourth industrial revolution

One of the things I like most of my academic job is the opportunity to visit different places and interact with different communities. Already during my PhD at the University of Salerno, Italy, we had substantial funding to travel for workshops and conferences, and I exploited the opportunity as best as I could.. undoubtedly this helped me to promote my work and acquire networking skills that have played an important role in the development of my career. Today, I strongly encourage my students to do the same, and they are always happy to visit exotic locations for the sake of science. Moreover, we are ourselves, as a research group, creating such opportunities for a broader community of early career researchers. The most concrete example is the Quantum Roundabout postgraduate conference, which has become a tradition in Nottingham organised by my most junior students every other year. We are about to host the third edition on July 6th-8th, and I very much look forward to the scientific presentations and ideas exchange; Rosanna, Bartosz and Pietro are working so hard to make this a memorable event.

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This week I am away attending a different type of event, at least different compared to my usual scientific conferences. I have been honoured as Young Scientist by the World Economic Forum (WEF), which means I have been selected within a group of 45 scientists under 40 years of age, including a delegation of European Research Council (ERC) Grantees, to attend the 10th edition of the WEF Annual Meeting of the New Champions in Tianjin (China), also known as Summer Davos 2016. This events brings together our (relatively small) group of scientists, a group of Tech Pioneers (promising entrepreneurs at the initial stages of their ventures), a large number of companies, press, and financial delegates, and world leaders including the Chinese Premier, the Canadian Minister of Innovation, etc., for a total of over 2000 participants. In a beautifully designed Convention Centre, we have all sorts of sessions from 7.30am to 6pm to learn and discuss around the main theme: The Fourth Industrial Revolution and its Transformational Impact.

So what is this all about?

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Posted in Conferences, Quantum research, Science & Society | Leave a comment

There is no local realism within the quantum realm!

What is reality? Is there a mathematically rigorous way to define it? Following the German philosopher Immanuel Kant, we can at least start by vaguely identifying two different kinds of reality: anything that we come across a posteriori as a result of an observation, so-called phenomenon, and anything-in-itself a priori with respect to our observation, so-called noumenon. In the following we will be interested in the latter form of reality and ask the question: is it there even if we do not observe it? In other (Einstein’s) words: is the moon there when no one looks? Of course many other questions immediately follow, such as: how can we ever prove that there is no reality-in-itself if we are by definition not allowed to observe it? Can we resort to the phenomenon to prove the nonexistence of the noumenon?

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A somewhat coherent post on a robust idea

[This is a guest post by our long-time friend and collaborator Marco Piani, cross-posted on his blog Quantum Rules]

The word “coherence” has different meaning for different people. Most people may think of the notion of being logical and consistent, be it in speaking or in acting. Actually, we all hope to deal with people — especially politicians(!) — who exhibit coherence between what they say and what they do. And we all hope that the next major blockbuster movie is coherent, with no major plot holes that make you grind your teeth in your seat, unable to fully enjoy your popcorn.

Nonetheless, to a physicist, coherence is also a notion associated with wave behaviour. More precisely, it is associated with the possibility of seeing the effects of superposition, which is the coherent(!) combination of different physical possibilities. For example, the superposition of sounds waves is what allows people to listen to music in the background, while pleasantly chatting.

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Posted in Interference, Quantum research, Superposition | 2 Comments

Tangram puzzles and the cost of calculating entanglement

I haven’t got many memories of my time as a kid. They mostly survive through exhilarating accounts narrated by my parents to other relatives and friends over and over again… but I do not remember living most of them (not sure why). Yet one of the distinctive memories I have is that of me sitting in the one and only barber shop in my home village, sometime during my primary school years, and discovering a great way of killing time during the long waits: Tangram. Yes, Tangram, the traditional dissection puzzle invented ages ago in China and imported in the western world during the 19th century, a sample of which eventually ended up in that barber shop.

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Tangram set (source: Wikipedia)

I clearly remember myself playing with the seven wooden pieces, and the cheer of satisfaction when I finally figured out a way to reassemble them into the designed large square. More recently, with the advent of smartphones, plenty of Tangram puzzle apps became available for download, all based on the same principle: reassembling a number of small polygonal pieces in a puzzle, to reconstruct a target, more complex shape. Sometimes, there is only one way to achieve the goal, given the set pieces; some other times, there are multiple solutions to a puzzle.

Today I am going to discuss a variation of the Tangram puzzles, with an important twist: price. Imagine that each of the set pieces, to be used for assembling the final target shape, comes at a cost (that we will indicate with the currency symbol ¥). For any given target shape, the goal of the game is then to find the solution which minimizes the overall cost. This may not be necessarily the one with the least amount of used pieces, but must be the solution (or solutions) involving the overall cheapest possible combination of the pieces, in order to reconstruct the target.

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Posted in Entanglement, Geometry, Quantum research | 1 Comment