Scottish physicists have made a breakthrough in quantum holography, which now allows you to form clear images without interference from external influences. The new method, according to a publication in Nature Physics, is based on the quantum entanglement of photon polarizations.
Most holography techniques rely on a laser that splits into an object beam and a reference beam, illuminating the subject in a specific way. The new quantum holography technology also uses two beams, but they don’t interact with each other as usual. “A blue laser passes through the substance of a crystal and splits into two beams of entangled photons. When the properties of a photon from one beam change as a result of an external influence, the properties of the photon entangled with it in the other beam change as well. As in conventional holography, one beam illuminates an object, with the phases of the light waves changing,” Glasgow University researchers say.
The second beam, the scientists add, penetrates a spatial light-wave modulator that partially reduces the speed of photons passing through it. As a result, the light waves change phase. The hologram is formed by measuring the correlation between the location of entangled photons using several megapixel digital sensors.
Scientists conducted a series of experiments in which they obtained clear images of several objects. Quantum holography, as the authors of the new technology note, is devoid of the shortcomings of conventional holographic techniques, which opens the way for using the technology in medicine and other fields.