Details will be described at the SPIE conference on Quantum Communication and Quantum Imaging held in San Diego on August 15, 2012.
Until now, the majority of researchers in quantum information science have believed that quantum cryptography (quantum key distribution) can provide unconditional security. The guarantee of its unconditional security is given by the trace distance, which is a quantum version of the evaluation of a mathematical cipher.
However, since 2006, new developments in the field have cast criticism over the meaningful security of cryptography ensured only by the trace distance. Despite these criticisms, many papers have continued to claim that the trace distance guarantees unconditional security in quantum key distribution.
Researchers at Quantum ICT have now succeeded in clarifying a logical path between the present theory and criticisms of it. Consequently, they have proved that the present theory does not work to quantify security, and cannot provide the unconditional security given in Shannon’s theory, the theory that rigorously defines the security for an unbreakable cipher.The details of this work will be presented at the SPIE conference on Quantum Communication and Quantum Imaging held in San Diego on August 15, 2012.
The title of the talk is “Incompleteness and Limit of Quantum Key Distribution Theory”.
Consequently, Yuen’s theory is correct, and at present there is no theoretical proof of the unconditional security for any QKD.
Quantum information science holds enormous promise for entirely new kinds of computing and communications, including important problems that are intractable using conventional digital technology. The most expected field is quantum cryptography. But realizing that promise will depend on theoretical guarantee of the security and the ability to transfer an extremely fragile quantum condition. Recently it has been pointed out sometimes that, in general, scientists are not familiar with practical applications. The quantum cryptography (quantum key distribution: QKD) is a typical example of the stern realities.Now, despite enormous progress in theoretical QKD, many theory groups are still discussing the security proof for QKD based on Renner’s trace distance theory. One of reasons is that H.P.Yuen (Northwestern University) pointed out that the present theory does not guarantee the security of the real QKD system [1,2].
Recently, Renner et al announced that in any practical implementation, the generated key length is limited by the available resources, and the present security proofs are not established rigorously in such a situation. And they published own improvement result in Nature Communication in 2012 . However, without the review of the incompleteness of the theory, it is repeatedly and persistently claimed that a specific trace distance criterion would guarantee unconditional security in QKD. And, unfortunately, almost all the theory groups on QKD ignored the criticisms. This is disagreeable in the development of science and technology. Researchers are obliged to clarify "what is going on" in the discussion of the scientific theory.
At present, there is no review on such a dispute. Our purpose is to clarify a story of the argument on the recent theory of QKD and the criticism against them. We introduced the Shannon theory on the cryptography to confirm the basis of the concept of the unconditional security. And we compared the fundamental concept of the current security theory of QKD by R.Renner and. the outline of the Yuen's criticism. Finally, we provided evidence on which there is no theoretical proof of the unconditional security for any QKD, despite that many theoretical papers claimed the perfect proof of the unconditional security. H.P.Yuen, Key generation: Foundation and a new quantum approach,
Nature Communication, vol-3, p639, 2012.Tamagawa University Contact:
Osamu Hirota | Tamagawa University
23.01.2018 | Physikalisch-Technische Bundesanstalt (PTB)
New for three types of extreme-energy space particles: Theory shows unified origin
23.01.2018 | Penn State
Physicists have developed a technique based on optical microscopy that can be used to create images of atoms on the nanoscale. In particular, the new method allows the imaging of quantum dots in a semiconductor chip. Together with colleagues from the University of Bochum, scientists from the University of Basel’s Department of Physics and the Swiss Nanoscience Institute reported the findings in the journal Nature Photonics.
Microscopes allow us to see structures that are otherwise invisible to the human eye. However, conventional optical microscopes cannot be used to image...
On the way to an intelligent laboratory, physicists from Innsbruck and Vienna present an artificial agent that autonomously designs quantum experiments. In initial experiments, the system has independently (re)discovered experimental techniques that are nowadays standard in modern quantum optical laboratories. This shows how machines could play a more creative role in research in the future.
We carry smartphones in our pockets, the streets are dotted with semi-autonomous cars, but in the research laboratory experiments are still being designed by...
What enables electrons to be transferred swiftly, for example during photosynthesis? An interdisciplinary team of researchers has worked out the details of how...
For the first time, scientists have precisely measured the effective electrical charge of a single molecule in solution. This fundamental insight of an SNSF Professor could also pave the way for future medical diagnostics.
Electrical charge is one of the key properties that allows molecules to interact. Life itself depends on this phenomenon: many biological processes involve...
At the JEC World Composite Show in Paris in March 2018, the Fraunhofer Institute for Laser Technology ILT will be focusing on the latest trends and innovations in laser machining of composites. Among other things, researchers at the booth shared with the Aachen Center for Integrative Lightweight Production (AZL) will demonstrate how lasers can be used for joining, structuring, cutting and drilling composite materials.
No other industry has attracted as much public attention to composite materials as the automotive industry, which along with the aerospace industry is a driver...
08.01.2018 | Event News
11.12.2017 | Event News
08.12.2017 | Event News
23.01.2018 | Life Sciences
23.01.2018 | Earth Sciences
23.01.2018 | Physics and Astronomy