Yes, we know that sometimes it feels like they just tack the word quantum on new technology and call it a day like we are all living in the Marvel Cinematic Universe. Nevertheless, quantum technology is very real and is just as exciting. Our better understanding of the quantum world and handle on the principals will help us improve everything from computing to encryption.
One of the advantages of the quantum revolution is the ability to sense the world in a new way. The general idea is to use the special properties of quantum mechanics to make measurements or produce images that are otherwise impossible.
Much of this work is done with photons. But as far as the electromagnetic spectrum is concerned, the quantum revolution has been a little one-sided. Almost all the advances in quantum computing, cryptography, teleportation, and so on have involved visible or near-visible light.
Yay face_with_colon_three
Austrian and Chinese scientists have succeeded in teleporting three-dimensional quantum states for the first time. High-dimensional teleportation could play an important role in future quantum computers.
Researchers from the Austrian Academy of Sciences and the University of Vienna have experimentally demonstrated what was previously only a theoretical possibility. Together with quantum physicists from the University of Science and Technology of China, they have succeeded in teleporting complex high-dimensional quantum states. The research teams report this international first in the journal Physical Review Letters.
In their study, the researchers teleported the quantum state of one photon (light particle) to another distant one. Previously, only two-level states (“qubits”) had been transmitted, i.e., information with values “0” or “1”. However, the scientists succeeded in teleporting a three-level state, a so-called “qutrit”. In quantum physics, unlike in classical computer science, “0” and “1” are not an ‘either/or’ – both simultaneously, or anything in between, is also possible. The Austrian-Chinese team has now demonstrated this in practice with a third possibility “2”.
Together with the University of Innsbruck, the ETH Zurich and Interactive Fully Electrical Vehicles SRL, Infineon Austria is researching specific questions on the commercial use of quantum computers. With new innovations in design and manufacturing, the partners from universities and industry want to develop affordable components for quantum computers.
The ability to securely transmit information over the internet is extremely important, but most of the time, eavesdroppers can still generally determine who the sender and receiver are. In some highly confidential situations, it is important that the sender’s and receiver’s identities remain anonymous.
Over the past couple of decades, researchers have been developing protocols for anonymously transmitting messages over classical networks, but similar protocols for quantum networks are still in much earlier stages of development. The anonymity methods that have been proposed for quantum networks so far face challenges such as implementation difficulties or require that strong assumptions be made about the resources, making them impractical for use in the real world.
In a new paper, Anupama Unnikrishnan, Ian MacFarlane, Richard Yi, Eleni Diamanti, Damian Markham, and Iordanis Kerenidis, from the University of Oxford, MIT, Sorbonne University, the University of Paris and CNRS, have proposed the first practical protocol for anonymous communication in quantum networks.
Magnetic resonance imaging is nothing new, but scientists were able to perform an MRI on a single atom. But how?
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Scientists recently captured the smallest MRI ever while scanning an individual atom. The technique successfully reached a breakthrough level of resolution in the world of microscopy, the detailed MRI can reveal single atoms as well as different types of atoms based on their magnetic interactions.
This breakthrough has potential applications in all kinds of fields, like quantum computing where it could be used to design atomic-scale methods of storing info or when it comes to drug development, the ability to control individual atoms could potentially be used to study how proteins fold and then lead to the development of drugs for diseases like Alzheimers.
In a sense, the researchers combined a version of an MRI machine with a special instrument called a scanning tunneling microscope, which turned out to be a match made in microscopy heaven.
An MRI scanner creates an extremely strong magnetic field around whatever it’s trying to image, temporarily re-aligning the protons in your body with that magnetic field. Then the MRI machine pulses the sample (or patient) with a radiofrequency, which pulls the protons slightly out of alignment with the magnetic field. And after the brief radiofrequency pulse is over, the protons snap back into alignment with the field, and the energy that’s released as the protons move back into place with the magnetic field is what is detected and visualized by the machine.
And a scanning tunneling microscope is used for imaging really tiny surfaces, and it can pick up certain properties like size and molecular structure.
Cambridge Quantum Computing has a demo of its quantum key security generation at Ironbridgeapi.com.
Y.-H. Luo et al. Quantum teleportation in high dimensions. Physical Review Letters. Vol. 123, August 16, 2019. doi:10.1103/PhysRevLett.123.070505.
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Researchers from the Austrian Academy of Sciences and the University of Vienna have experimentally demonstrated what was previously only a theoretical possibility. Together with quantum physicists from the University of Science and Technology of China, they have succeeded in teleporting complex high-dimensional quantum states. The research teams report this international first in the journal “Physical Review Letters”.
In their study, the researchers teleported the quantum state of one photon (light particle) to another distant one. Previously, only two-level states (“qubits”) had been transmitted, i.e., information with values “0” or “1”. However, the scientists succeeded in teleporting a three-level state, a so-called “qutrit”. In quantum physics, unlike in classical computer science, “0” and “1” are not an ‘either/or’ – both simultaneously, or anything in between, is also possible. The Austrian-Chinese team has now demonstrated this in practice with a third possibility “2”.
Novel experimental method.
