Radar, electromagnetic sensor used for detecting, locating, tracking, and recognizing objects of various kinds at considerable distances. It operates by transmitting electromagnetic energy toward objects, commonly referred to as targets, and observing the echoes returned from them.  Energy is emitted in various frequencies and wavelengths from large wavelength radio waves to …

Just as classical computers are unthinkable without memories, quantum memories will be essential elements for future quantum information processors.  Quantum memories are devices that can store quantum information for a long time with very high fidelity and efficiency. Quantum memories are devices that can store the quantum state of a photon, …