Click For Photo: https://3c1703fe8d.site.internapcdn.net/newman/gfx/news/2019/aconnectionb.jpg
Researchers of the Academy explore the consequences of locality for measurements distributed in spacetime. Their article has now been published in the Nature journal Quantum Information.
Locality is a fundamental principle behind all physical interactions. It says that each physical system can only interact with other systems in its immediate vicinity, so that interactions between two distant objects must be mediated by an intermediary. For instance, in the familiar case of radio communication devices and mobile phones, that send and receive information over a distance, the role of the intermediary is played by electromagnetic waves. Particle physics tells us that elementary particles behave similarly. When two of them exert a force on each other, this does not happen instantaneously over distance, rather by an exchange of a particle which mediates that force locally. An important consequence of the locality of interactions is that many physical systems, such as solids as well as quantum fields describing elementary particles, satisfy the so-called "area law" property.
Property - Observers - Alice - Bob - Perform
To explain what this property means, imagine two observers Alice and Bob, that perform measurements on the constituent parts of a whole physical system. Alice can only measure the parts that lie inside a region of space which is separated by a boundary from the rest of space; whereas Bob can perform measurements on the parts that lie outside Alice's region. The "area law" roughly means that the degree to which the outcomes of Alice's and Bob's measurements are correlated is determined by the area of the boundary that separates Alice's region from Bob's regions, rather than by the volume of the region. This is somewhat surprising, as many other thermodynamic...
Wake Up To Breaking News!