MIT News March 8, 2018 A team of researchers in the US (MIT, Dartmouth College) combined NMR techniques with their knowledge of the spin dynamics in their crystal, whose geometry approximately confines the evolution to linear spin chains. It allowed them to figure out a metric, average correlation length, for how many spins are connected to each other in a chain and determine if the interaction is winning or disorder is winning keeping the system in a more quantum localized state. The method represents a possible advance toward the ability to control localization. Because many-body localization preserves information and prevents […]
Tag Archives: Communications technology
‘Two-way signaling’ possible with a single quantum particle
Physorg February 26, 2018 By using a quantum particle that has been put in a superposition of two different locations, researchers in Austria have theoretically shown that both partners are able to encode their messages into a single quantum particle simultaneously. Being in a quantum superposition means that the quantum particle is “simultaneously present” at each partner’s location. Therefore, both partners are able to encode their messages into a single quantum particle simultaneously, a task that is essentially impossible using classical physics. The experimental results show that the communication is secure and anonymous, the direction of communication is hidden—an eavesdropper […]
Breakthrough in controlling light transmission
Physorg February 8, 2018 A team of researchers in the US (UT Austin, City University of New York) has shown that a non-magnetic device free of an external power source can dramatically break transmission symmetry and realize efficient broadband isolation. Using two judiciously designed nonlinear resonators connected through a delay line, they showed that this is the minimal configuration for enabling low-loss one-way transmission over a broad bandwidth. The combined components, which were printed on a circuit board, formed a highly effective, fully passive isolator that provides excellent signal integrity… read more. TECHNICAL ARTICLE
Ocean of Things Aims to Expand Maritime Awareness across Open Seas
Source: DARPA, December 6, 2017 DARPA’s Ocean of Things program seeks to enable persistent maritime situational awareness over large ocean areas by deploying thousands of small, low-cost floats that could form a distributed sensor network. Each smart float would contain a suite of commercially available sensors to collect environmental data—such as ocean temperature, sea state, and location—as well as activity data about commercial vessels, aircraft, and even maritime mammals moving through the area. The floats would transmit data periodically via satellite to a cloud network for storage and real-time analysis. The technical challenge lies in two key areas: float development […]