ISTA physicists have developed a breakthrough method to connect superconducting qubits using fiber optics instead of traditional electrical signals, significantly reducing cooling requirements and potentially enabling the scaling and networking of quantum computers by converting optical signals to microwave frequencies that qubits can process.
Researchers resolved the apparent paradox between quantum mechanics and classical thermodynamics by demonstrating that while von Neumann entropy remains constant in quantum systems, Shannon entropy increases over time just as classical entropy does, thereby reconciling quantum theory with the second law of thermodynamics.
Researchers have developed a groundbreaking method enabling quantum computers to switch between different error correction codes during computation, overcoming a fundamental limitation in quantum computing where no single code can efficiently perform all necessary operations while maintaining error protection.
Trapped ions have previously only been entangled in one and the same laboratory. Now, teams have entangled two ions over a distance of 230 meters. The nodes of this network were housed in two labs at the Campus Technik to the west of Innsbruck, Austria. The experiment shows that trapped ions are a promising platform for future quantum networks that span cities and eventually continents.
The quantum nature of objects visible to the naked eye is currently a much-discussed research question. A team has now demonstrated a new method in the laboratory that could make the quantum properties of macroscopic objects more accessible than before. With the method, the researchers were able to increase the efficiency of an established cooling method by an order of a magnitude.
Two seemingly different areas of physics are related in subtle ways: Quantum theory and thermodynamics. How can the laws of thermodynamics arise from the laws of quantum physics? This question has now been pursued with computer simulations, which showed that chaos plays a crucial role: Only where chaos prevails do the well-known rules of thermodynamics follow from quantum physics.
Computing power of quantum machines is currently still very low. Increasing it is still proving to be a major challenge. Physicists now present a new architecture for a universal quantum computer that overcomes such limitations and could be the basis of the next generation of quantum computers soon.
Physicists have discovered how to switch topological states on and off in a strongly correlated metal using magnetic fields, a breakthrough made possible by the collective behavior of electrons that dramatically amplifies the material’s response to external magnetic fields and could enable new applications in quantum computing and sensor technology.
Researchers have developed a method to make previously hardly accessible properties in quantum systems measurable. The new method for determining the quantum state in quantum simulators reduces the number of necessary measurements and makes work with quantum simulators much more efficient.
A new method has been developed at TU Wien, Austria, to produce entangled atom pairs and not just atoms which are emitted in all directions, but well-defined beams. This was achieved with the help of ultracold atom clouds in electromagnetic traps.
A team of researchers at Vienna Center for Quantum Science and Technology (VCQ) and Centre for Quantum Technologies, Singapore (CQT), has demonstrated homomorphic-encrypted quantum computing with unitary transformations of individual qubits, as well as multi-qubit quantum walk computations using single-photon states and non-birefringent integrated optics.
Researchers from the University of Innsbruck have entangled two qubits distributed over several quantum objects and successfully transmitted their quantum properties.
IBM recently added support in Qiskit for trapped ion-based quantum computing devices.