Phys.org October 17, 2019 In their efforts to observe quantum phenomena on a macroscopic scale, researchers in Denmark managed to create a network of 30,000 entangled pulses of light arranged in a two-dimensional lattice distributed in space and time. They produced light beams with special quantum mechanical properties (squeezed states) and woven them together using optical fibre components to form a cluster state. An optical quantum computer will therefore not require costly and advanced refrigeration technology, its information-carrying light-based qubits in the laser light will be much more durable and it can be more easily be scaled to contain hundreds […]
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An important step towards completely secure quantum communication network
Phys.org November 28, 2018 For practical long-distance quantum communication room-temperature atomic vapours are important. Atomic motion has so far limited the single-excitation lifetime in such systems to the microsecond range. Researchers in Denmark have demonstrated that lifespan of the quantum state at room temperature can be extended to about a quarter of a millisecond. They used a small glass container, filled with Cesium atoms, in which they were able to load, store and retrieve single photons from, the quantum states necessary for the repeater. This technique improves the life span of the quantum states at room temperature a hundred times…read […]