• The new breed of radar is a hybrid system that uses quantum correlation between microwave and optical beams to detect objects of low reflectivity such as cancer cells or aircraft with a stealth capability. Because the quantum radar operates at much lower energies than conventional systems, it has the long-term potential for applications in biomedicine, including non-invasive nuclear magnetic resonance scans
  • The idea is to use “quantum illumination” to “interrogate the target region with one optical beam while retaining its entangled counterpart for subsequent joint measurement with the light returned from that target region."
  • Quantum illumination has only been demonstrated at optical wavelengths, but the research team found that a special converter — a double-cavity device that couples the microwave beam to an optical beam using a nano-mechanical oscillator — was the key to enabling the concept to work at microwave frequencies.

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