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QC: may I say that I am skeptical?

Quantum Computing is becoming the talk of the town. Yet, for real computation it seems to be at the end of the rainbow. Its use in quantum communications, on the other hand, seems within grasp. Roadmap by NICT

I have been hearing, and I have been following quantum computer (ideas and prototypes) for many years and I saw progress but the end of the line is nowhere nearer, at least this is my impression.

Tangle Lake, a 49 Qubit chip. Image credit: Intel

Intel has showcased its 49Qubit quantum chip, Tangle Lake, at CES 2018 (which is an amazing feat but it is not a quantum computer that can be take the so called quantum supremacy (the point when QC will make today’s computers history).

Q System, a 50 Qubit system. Image credit: IBM

IBM is fighting back with their 50 Qubits announced at the end of last year and showcased their prototype in February 2018.

Bristlecone, a 72 Qubit chip. Image credit: Google

Google followed suit in March with Bristlecone sporting 72 Qubits.

Impressive, isn’t it? After years of struggling to in the single digit area in just a few months research has been able to get close to 3 digits. Well, actually 72 Qubits is not as close to 100 Qubits as it might seem at first glance.

Additionally, to really get a quantum supremacy in computing you would need something over 1,000 Qubits. The problem (and the nice thing) about QC is that the number of Qubits sustain a parallel processing of all possible combination, that is 2**Qubit (2 at the power of Qubit). This is an exponential number and getting 1,000 Qubit power would mean the capability to address 2**1000 (or 10 followed by 300 zero, and that is a pretty big number, far far bigger than the estimated number of elementary particles in the known Universe), BUT it would also mean to have the capability of managing the coherence of all those states (and correcting errors that inevitably would pop up).

This with the current, and foreseen technology, is just out of the question.

This is basically the point being made in the editorial comment on Slashdot and I am fully in synch with that.

Now, don’t take me wrong. This is an exciting area of research, but it is creating a lot of hype and practical results are no-where in sight. Should we drop it since, at least for the foreseeable future the quantum supremacy will remain at the end of the rainbow? No, I don’t think so. This is an exploration journey and I am sure that on the way a lot will be discovered that can result in useful application. It is not about the destination but it is about the journey.

There are, however, concrete (still challenges) practical application of quantum ICT as shown in the roadmap for quantum communications. We already have a few applications, and products, for quantum cryptography, an area that will become ever more important in the coming decade as more and more data value will be tied to data flowing through communications networks. Their volume, as shown in the roadmap, is expected to grow into the Exabyte range by 2040. In that timeframe QC is still allocated in the yellow research band.

About Roberto Saracco

Roberto Saracco fell in love with technology and its implications long time ago. His background is in math and computer science. Until April 2017 he led the EIT Digital Italian Node and then was head of the Industrial Doctoral School of EIT Digital up to September 2018. Previously, up to December 2011 he was the Director of the Telecom Italia Future Centre in Venice, looking at the interplay of technology evolution, economics and society. At the turn of the century he led a World Bank-Infodev project to stimulate entrepreneurship in Latin America. He is a senior member of IEEE where he leads the New Initiative Committee and co-chairs the Digital Reality Initiative. He is a member of the IEEE in 2050 Ad Hoc Committee. He teaches a Master course on Technology Forecasting and Market impact at the University of Trento. He has published over 100 papers in journals and magazines and 14 books.