In cosmic voids where the density of galaxies is far lower than standard, astronomers have observed weak magnetic fields that may provide a window into the early universe. The fields 10-17-10-10 G in magnitude with large coherence lengths of up to megaparsecs are thought to have their origins in the early universe, but so far it is unclear when or how…
Tag: coherence
Researchers demonstrate nondestructive mid-infrared imaging using entangled photons
Researchers have shown that entangled photons can be used to improve the penetration depth of optical coherence tomography (OCT) in highly scattering materials. The method represents a way to perform OCT with mid-infrared wavelengths and could be useful for non-destructive testing and analysis of materials such as ceramics and paint samples. …
60-year-old limit to lasers overturned by quantum researchers
A team of Australian quantum theorists has shown how to break a bound that had been believed, for 60 years, to fundamentally limit the coherence of lasers. …
Researchers perform quantum simulation of dynamical phase transitions
Quantum simulation uses a controllable quantum system to mimic complex systems or solve intractable problems, among which the non-equilibrium problems of quantum many-body systems have attracted wide research interest. Such systems are hard to simulate using classical computers. Instead, popular quantum simulators, such as superconducting circuits, can provide insights into these problems. As considerable advances have been made in scalability, coherence…
Breathing Habits Are Related To Physical and Mental Health
An anonymous reader quotes a report from The Wall Street Journal, written by James Nestor: Breathing is a missing pillar of health, and our attention to it is long overdue. Most of us misunderstand breathing. We see it as passive, something that we just do. Breathe, live; stop breathing, die. But breathing is not that simple and binary. How we breathe…
Manufacturing-friendly SiC boasts quantum credentials at telecom wavelengths
Decoherence is the bane of quantum technologies. In coherent systems, the phase of the wave functions representing the quantum states of particles in the system have definite relations between each other. This allows quantum devices to operate in a meaningful way that differs from classical devices. However, interacting with the world around us rapidly leads to decoherence, which makes it harder…
Ultrafast probing reveals intricate dynamics of quantum coherence
Ultrafast, multidimensional spectroscopy unlocks macroscopic-scale effects of quantum electronic correlations. …
Researchers achieve quantum control of an oscillator using a Josephson circuit
Superconducting circuits, which have zero electrical resistance, could enable the development of electronic components that are significantly more energy-efficient than most chips used today. Importantly, superconducting circuits rely on an electronic element known as the Josephson junction, which allows them to manipulate quantum information and mediate photon interactions. While past studies have tried to enhance the performance and coherence of Josephson…
Something Strange Seems To Be Causing Distant Galaxies To Synchronize
pgmrdlm quotes Futurism: Massive StructuresGalaxies millions of light years away seem to be connected by an unseen network of massive intergalactic structures, which force them to synchronize in ways that can’t be explained by existing astrophysics, Vice reports. The discoveries could force us to rethink our fundamental understanding of the universe. “The observed coherence must have some relationship with large-scale structures,…
Study observes anomalous decay of coherence in a dissipative many-body system
In quantum physics, some of the most interesting effects are the result of interferences. Decoherence, or loss of coherence, occurs when a quantum system eventually loses the ability to produce interferences, due to external noise or coupling to a larger and unmonitored system (i.e. the surrounding environment). …