/computing with light and molecules – Northern Gwinnett News (via Qpute.com)
computing with light and molecules – Northern Gwinnett News

computing with light and molecules – Northern Gwinnett News (via Qpute.com)


Peter Müller

It will be a long time before quantum computers can prove their superiority. The investigation proceeds step by step.

Enlarge a qubit, please!

© Perig Production – shutterstock.com

Research on the quantum computer is entering a new phase, quantum superiority has been proven in numerous experiments. The goal of a scalable platform for quantum computers with high-number error-corrected qubits and a corresponding quantum volume is still about twenty years away. The research pursues different approaches, such as superconducting systems with Josephson junctions as equivalent to transistors, atomic systems or molecular and photonic platforms for quantum communication. After all, the era of “noisy intermediate-scale quantum devices” has dawned, as Professor Peter Zoller of the University of Innsbruck explains in a seminar organized by the Science Media Center. These are machines that can do initial quantum calculations with qubits that have not been corrected for errors on the order of 50 to 100.

Greater coherence with nuclear spin states

Researchers from the Karlsruhe Institute of Technology (KIT) and Chimie ParisTech – CNRS report in the specialized journal Nature Communications a significant advance in light-addressable quantum units, leading to a longer coherence of the superimposed quantum states.

Expand Researchers want to advance the development of quantum computers based on the europium (III) molecule.

© S Kuppusamy, KIT

The experiment uses europium (III) molecules, whose quantum states are detected at the light nuclear spin interface: the excited states of the ligands (coordinatively linked molecules) transfer the europium to the rare earth nuclear spin and return to the ground state. with light emission. The experiment demonstrates the possibility of a qubit complex containing rare earth ions that can be approached with light to operate with quanta. “By demonstrating polarization at a light nuclear spin interface, which is associated with the nuclear spin of the europium (III) ion, in a molecule for the first time, we see a promising step towards the development of quantum computer architectures based on complexes. containing rare earth ions were successful, “explains Dr. Philippe Goldner of the CNRS.

Quantum Computers: The State of Things

In theory, the quantum computer is superior to the classical one, since its quantum bits (qubits) can not only assume states like 0 and 1, but also, thanks to quantum superposition, in many intermediate states simultaneously. This makes parallel computing possible with exponentially increasing computing power, especially in materials research, quantum chemistry, and for optimization problems, quantum algorithms can arrive at solutions in finite time. However, so far no experiment with 50 to 100 qubits has been able to solve problems that could not have been calculated with a classical computer, explains Professor Immanuel Bloch, Director and Head of the Department of Many-Body Quantum Systems at Max Planck. Institute for Quantum Optics in Garching, near Munich. A logical qubit must be made up of around 10,000 physical qubits for error correction to be possible. Another important key figure of the quantum computer is the quantum volume, that is, a measure of the (logical) qubits that can be used at the same time. Experts estimate that it will be 15 to 20 years before a quantum computer can be widely used.


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