News - Quantum Nanoscience
N. Fiaschi, B. Hensen, A. Wallucks, R. Benevides, J. Li, T.P. M. Alegre, and S. Gröblacher, Optomechanical quantum teleportation, Nature Photon. (2021) https://www.nature.com/articles/s41566-021-00866-z
Quantum technology typically employs qubits (quantum bits) consisting of, for example, single electrons, photons, or atoms. A group of TU Delft researchers has now demonstrated the ability to teleport an arbitrary qubit state from a single photon onto an optomechanical device – consisting of a mechanical structure comprising billions of atoms. Their breakthrough research, now published in Nature Photonics, enables real-world applications such as quantum internet repeater nodes while also allowing quantum mechanics itself to be studied in new ways.
The field of quantum optomechanics uses optical means to control mechanical motion in the quantum regime. The first quantum effects in microscale mechanical devices were demonstrated about ten years ago. Focussed efforts have since resulted in entangled states between optomechanical devices as well as demonstrations of an optomechanical quantum memory. Now, the group of Simon Gröblacher, of the Kavli Institute of Nanoscience and the Department of Quantum Nanoscience at Delft University of Technology, in collaboration with researchers from the University of Campinas in Brazil, has shown the first successful teleportation of an arbitrary optical qubit state onto a micromechanical quantum memory.
The Rubicon grant enables young, promising researchers to do research at a top institution abroad. For many scientists, experience in a foreign country is an important step in their career.
Making quantum computers small again
Who? Mario Gely (Gary Steele group)
What? Quantum computers are growing ever larger, getting closer to fulfilling their potential, but if they already fill a whole room... they have to grow in a different way! This research aims to make a quantum computer fit on a chip.
Where? University of Oxford
How materials behave depends on the interactions between countless atoms. You could see this as a giant group chat in which atoms are continuously exchanging quantum information. Researchers from Delft University of Technology in collaboration with RWTH Aachen University and the Research Center Julich have now been able to intercept a chat between two atoms. They present their findings in Science on 28 May, "Free coherent evolution of a coupled atomic spin system initialzed by electron scattering", Lukas M. Veldman, Laetitia Farinacci, Rasa Rejali, Rik Broekhoven, Jeremie Gobeil, David Coffey, Markus Ternes, Alexander F. Otte, https://science.sciencemag.org/content/372/6545/964
Ultrafast control of magnetic interactions via light-driven phonons
D. Afanasiev, J.R. Hortensius, B.A. Ivanov, A. Sasani, E. Bousquet, Y.M. Blanter, R.V. Mikhaylovskiy, A.V. Kimel and A.D. Caviglia, Nature Materials 20, 607-611 (2021), https://nature.com/nmat/volumes/20/issues/5
An international team led by researchers of Delft University of Technology (TU Delft) has managed to manipulate the magnetic state of a magnetic material by optically shaking it. The whole process happens within an extremely short time frame of less than a few picoseconds. In times of stalling efficiency trends of current technology, such atomically-driven ultrafast control of magnetism opens broad new vistas for information technology. The results, which have been published in Nature Materials, could eventually lead to fast and energy-efficient data processing technologies, which are essential to keep up with our data hunger.
The state of Lower Austria has been awarding science prizes to outstanding researchers since 1964. The appreciation prizes, which serve to honor a complete scientific work of supraregional importance, are the highest honor awarded in the field of science in Lower Austria. This year's two prizes were presented yesterday by Governor Johanna Mikl-Leitner and were given to the physicist Simon Gröblacher and the MedRadOnc research group.
Read more (in German)
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Publication in Communication Physics, Otte Lab
Remote detection and recording of atomic-scale spin dynamics
R.J.G.Elbertse, D. Coffey,J. Gobeil,A.F. Otte https://rdcu.be/b4oj0
Researchers at Delft University of Technology have developed a sensor that is only 11 atoms in size. The sensor is capable of capturing magnetic waves and consists of an antenna, a readout capability, a reset button and a memory unit. The researchers hope to use their atomic sensor to learn more about the behaviour of magnetic waves, so that hopefully such wavescan be used in green ICT applicationsone day.
A quantum memory at telecom wavelengths
A. Wallucks, I. Marinković, B. Hensen, R. Stockill, and S. Gröblacher
Nature Phys. https://www.nature.com/articles/s41567-020-0891-z (2020)
Building a large scale quantum network is one of the most exciting goals
of modern quantum physics. Such a network would allow to establish
absolutely secure communication, as well as connect future quantum
computing nodes over regional and global distances. While entanglement
distribution over relatively long distances has been possible for many
years, one of the other key components for such a network is still far
from a proven technology, namely a quantum memory. In our work we
demonstrate such a quantum memory, natively operating in the
telecommunication band. We realize our memory using a fully engineered
optomechanical system and demonstrate storage times of up to 2ms.
Schmidt Futures has selected Andreas Wallucks of the Simon Groeblacher Lab (Quantum Nanoscience) as one of their 22 early-career interdisciplinary Fellows. Wallucks will receive a a $100,000 stipend that allows him to change topics as a postdoc. He will join a community of fellows and will be paired with an internationally accomplished and experienced senior scientist as a mentor.
Andreas Wallucks spent his PhD working on new information storage techniques for quantum technology. He created a macroscopic entangled system using very delicate new micro-fabricated silicon devices which, when cooled to near absolute zero temperatures, stored information in the form of laser-pulse induced vibrations. As a Schmidt Science Fellow, Andreas is planning to pivot his research into optical sensors. He aims to develop optical detectors that can identify very low concentrations of biomolecules with potential applications for disease-detecting healthcare devices.
“I am super happy to be selected for the Schmidt fellowship”, Wallucks said. “It allows me to start looking for a research group where I can focus on a new topic: single molecule detection. I look forward to getting to know the community at the special events that the fellowship hosts throughout the year.”
About Schmidt Futures and the fellowship
Schmidt Futures is a philanthropic initiative founded by Eric and Wendy Schmidt that finds exceptional people and helps them do more for others together. The organization provides their Fellows with the skills and perspectives to harness and accelerate their exceptional scientific talents.
The Fellows are supported to pursue a postdoctoral research placement at a world-leading laboratory anywhere in the world. This placement must be in research at a significantly different discipline from the Fellow’s PhD, with the aim of exposing them to ideas and skills that will help them examine scientific problems and approaches from different perspectives and to accelerate discoveries.