Specialists continue their pursuit of digging deeper into quantum entanglement, which takes place when at least two different systems are made or interrelate with each other in a way that their respective quantum states cannot be independently described from that of the other. SciTechDaily notes how such systems have relation, even despite distant separation.
The study of phenomenon has become an interest because of its rich potential to be applied across communication, quantum computing, and encryption. The problem is that when systems interrelate with surroundings, they usually end up getting disentangled.
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Quantum Light Entanglement Challenges
The recent study published in the Physical Review Letters sheds light to such a concern. It was conducted by the LMCAL (Laboratory for Coherent Manipulation of Atoms and Light) of the Physics Institute from the University of São Paulo.
The researchers were able to come up with a singular light source that ended up with two light beams that had maintained entanglement.
Last study author and physicisty Hans Marin Florez notes how the said light source was an OPO, or optical parametric oscillator, which usually comprises an "optical response crystal" that is non-linear, as noted by SciTechDaily, situated between two different mirrors that end up with optical cavity formation. When a vibrant green light blazes over the apparatus, the dynamics of the mirror end up with two light beams that have quantum correlations.
The issue is that OPOs that are based on crystals emit light that is unable to interact with other interest systems when it comes to quantum information. This is because it does not have the same wavelength as other systems.
Florez notes that the research team revealed in previous efforts that atoms could be used as alternative medium to crystals. They, then, came up with an OPO that is grounded on rubidium atoms. In such a case, the team beams had strong quantum correlation. It also gained a source that has the capacity to interact with different systems with the possible capacity to constitute quantum memory.
This, however, did not suffice in proving the entanglement of the beams. Aside from the strength, it was also necessary for the phases of the beam, which are connected to the synchronization of lightwaves, to exhibit correlations in terms of quantum. This was what the researchers achieved in their study.
Significant Light Entanglement
The experts executed the same experiment but included new steps of detection that allowed them to gauge correlations within the generated fields' phases and amplitudes. They were, resultantly, able to reveal significant light entanglement.
Aside from that, this method of detection also enabled the researchers to see the higher richness levels of the entanglement structure. Rather than having two adjacent spectrum bands entangling with each other, the team actually came up with a system that covered four spectral bands that were entangled.
In such a case, the waves' phases and amplitudes also reflected significant entanglement. Such a case is considered fundamental when it comes to various protocols involving the transmission and processing of quantum-coded data.
Azo Quantum reports how one of the probable applications of such findings is the sensitivity boosting of magnetometers that are atomic and utilized to assess the human brain-produced alpha waves.
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