Scientists at Sandia National Laboratories and Max Planck Institute for the Science of Light have reported on a device that could replace a roomful of equipment used to entangle photons.
[A]nother meeting of minds underway this week in Vancouver, where organizers hope to renew the push to unite quantum mechanics with general relativity and create an overarching mathematical framework that explains all known phenomena.
Sensing with levitated nanoparticles has so far been limited by the precision of position measurements. Researchers at the Department of Experimental Physics of the University of Innsbruck, Austria, have now demonstrated a new technique that boosts the efficiency with which the position of a sub-micron levitated object is detected. The new technique demonstrated by Tracy Northup, a professor at the University of Innsbruck, and her team resolves this limitation by replacing the laser beam with the light of the particle reflected by a mirror.
A Bristol-led team of physicists has found a way to operate mass manufacturable photonic sensors at the quantum limit. This breakthrough paves the way for practical applications such as monitoring greenhouse gases and cancer detection.
Physicists study many forms of communication, including quantum communication. Thanks to specific properties of quantum mechanics, like entanglement, information integrity can be better maintained with quantum communications, even being hackproof in some cases.
How monitoring quantum Otto engine affects its performance – Minimizing the measurement effects preserves coherence across engine cycles and improves the power output and reliability
The Joint Center for Quantum Information and Computer Science (QuICS)—a research powerhouse focused on quantum computation, quantum communication and quantum cryptography—recently received a renewal of federal funding from the National Institute of Standards and Technology (NIST).
One of the most fundamental features of quantum physics is Bell nonlocality: the fact that the predictions of quantum mechanics cannot be explained by any local (classical) theory. This has remarkable conceptual consequences and far-reaching applications in quantum information. However, in our everyday experience, macroscopic objects seem to behave according to the rules of classical physics, and the correlations we see are local. Is this really the case, or can we challenge this view? In a recent paper in Physical Review Letters, scientists from the University of Vienna and the Institute of Quantum Optics and Quantum Information (IQOQI) of the Austrian Academy of Sciences have shown that it is possible to fully preserve the mathematical structure of quantum theory in the macroscopic limit. This could lead to observations of quantum nonlocality at the macroscopic scale.
Whatever the causes of these two results, they do show that there is something out there which established explanations cannot account for. Similarly unexplained anomalies were starting points for both quantum theory and relativity. It looks possible, therefore, that what has seemed one of physics’s darkest periods is about to brighten into a new morning.
An international team of researchers has used a high-speed electron camera to observe the atomic motion of liquid water for the first time.
