ETRI successfully exchanged quantum information on daylight in a free-space quantum key distribution
The Electronics and Telecommunications Research Institute (ETRI) has reported a successful free-space quantum key distribution (QKD) in daylight with the self-developed polarization encoding chip for the first time.
QKD is one of the most promising secure communication technologies, which encodes information into a single-photon, the smallest measurable unit of light.
By using the quantum mechanical properties of the single-photon, quantum cryptography guarantees secure information exchange between the distant parties. The report is particularly worthy of attention in two points as follows.
First, ETRI's free-space QKD system works successfully even during the daylight whereas most other systems have failed to operate properly due to substantial amount of noise photons from sunlight.
By developing and adopting elaborate noise filtering technologies, ETRI's QKD system achieved the secure key rate of 142.94 kbps with quantum bit error rate of 4.26% in daylight over the free-space distance of 275 m .
Second, ETRI's QKD system is configured with the self-developed polarization encoding chip, which dramatically reduces the size of the system compared to conventional QKD systems.
Miniaturizing key components is highly important to make QKD systems to be used for the secure communication solution of several applications requiring light-weight such as Unmanned Aircraft Vehicle (UAV) and automotive cars, whose security is one of the critical concerns.
The chip-based QKD component of ETRI is considered as a core technology for the commercialization of QKD system in various fields.
ETRI is now applying their integrated-chip technologies to other optical components to realize miniaturized QKD transceiver modules. Also, ETRI is trying to conduct the free-space QKD experiments for the extended transmission distance in daylight.
Yongsoon Baek | EurekAlert!
Accelerating quantum technologies with materials processing at the atomic scale
15.05.2019 | University of Oxford
A step towards probabilistic computing
15.05.2019 | University of Konstanz
A new assessment of NASA's record of global temperatures revealed that the agency's estimate of Earth's long-term temperature rise in recent decades is accurate to within less than a tenth of a degree Fahrenheit, providing confidence that past and future research is correctly capturing rising surface temperatures.
The most complete assessment ever of statistical uncertainty within the GISS Surface Temperature Analysis (GISTEMP) data product shows that the annual values...
Physicists at the University of Basel are able to show for the first time how a single electron looks in an artificial atom. A newly developed method enables them to show the probability of an electron being present in a space. This allows improved control of electron spins, which could serve as the smallest information unit in a future quantum computer. The experiments were published in Physical Review Letters and the related theory in Physical Review B.
The spin of an electron is a promising candidate for use as the smallest information unit (qubit) of a quantum computer. Controlling and switching this spin or...
Engineers at the University of Tokyo continually pioneer new ways to improve battery technology. Professor Atsuo Yamada and his team recently developed a...
With a quantum coprocessor in the cloud, physicists from Innsbruck, Austria, open the door to the simulation of previously unsolvable problems in chemistry, materials research or high-energy physics. The research groups led by Rainer Blatt and Peter Zoller report in the journal Nature how they simulated particle physics phenomena on 20 quantum bits and how the quantum simulator self-verified the result for the first time.
Many scientists are currently working on investigating how quantum advantage can be exploited on hardware already available today. Three years ago, physicists...
'Quantum technologies' utilise the unique phenomena of quantum superposition and entanglement to encode and process information, with potentially profound benefits to a wide range of information technologies from communications to sensing and computing.
However a major challenge in developing these technologies is that the quantum phenomena are very fragile, and only a handful of physical systems have been...
29.04.2019 | Event News
17.04.2019 | Event News
15.04.2019 | Event News
24.05.2019 | Physics and Astronomy
24.05.2019 | Medical Engineering
24.05.2019 | Life Sciences