Quantum entanglement

                                                                                     What is quantum?                                                                                                                                                        Quantum means a small pocket  of energy . World's smallest particle is atom, the physics inside the atom is known as quantum physics. Quantum physics is totally different from classical physics. It breaks all the laws of physics.                                                                                                                                                        Quantum entanglement  :                                                                  In 1920s quantum theory was started. All physicist  criticize quantum theory / mechanics.  In 1935 Albert Einstein releases an article. In that article, he mentioned problems in quantum mechanics. It gives entanglement effect example : if you measure a object at some point. An another object receives an effect which is far distance from that point it is against the physical reality. So, Albert Einstein said that quantum mechanics is no more yet and he explained the concept of entanglement.                                                          In classical physics, the objects are macro, if you measure an object it has some property like color , shape, mass and if another person measures the same object the property remains same. But in quantum physics it is completely opposite. If you measure an object it has some property. Then, another person measures the object it has some another property. The way of measure varies. So Albert Einstein was so confused. Then, Bohr says to understand quantum want to forgot all classical physics understanding. It  can only prove by mathematical                                                                   Entanglement experiment plan :                                                                               Take thousands of color balls close your eyes and pick out two balls randomly. One ball keep with you and an another ball place  in some box and send it some distance. Open your eyes see the ball's property it is red in color and an another ball in the box as the same property red in color. It quantum it is entangled . But in classical it is random. If it is random .then, it has some hidden variable in classical. For example: if you roll a dice, it has some hidden variable like earth's gravity, direction of air, table vibration. If you know all these then the Randomness should not be exist. You can get what number you want. But in quantum there is no hidden variable, so doing experiment was so challenging.                                         Bell's inequality:                                                                                     Bell assumed hidden variable .              three assumption:                                                                                    corresponding mathematical statement                                                                                 Realism :       fixed properties wheather seen or not example : the ball has some property red in color  wheather if it is seen or not it remains same.                                                                                            Locality :                                                                                               no external influence.                               Freedom of choice :                                                                             Measure freely , open the box in any side up or down or side, if it is all correct. Then, it has classical limit.                                                          Example : In classical, I took thousand pairs of balls and again closing my eyes I took 60% of red balls . It is classical , no entanglement. Iam using my brain and hidden variable, I know which side has red balls, then I took it. But in quantum there is 99% .                                                   Bells inequality limit :                                                                                            2                                                                                      2√2                                            if the experiment result was below 2 , then Einstein was correct there is no entanglement. But if the results were above 2 then there is possibility of Quantum entanglement.                                      Assumption not equal to experiment                 then it is quantum entanglement.                      In classical,                                                                                        obeys assumption I can say accurately how  many% of red  balls I can take.                               Quantum:                                                                                        quantum entanglement breaks all  the occurance.                                                                             Experiment :                                                                                 I took entangled photons sent to two different detectors. Iam sending an light which has more polarization. It passes through polarization filter which is called detectors. Polarization direction was vertical. Iam measuring another photons which is horizontal.. Iam sending more pairs of photons all pairs are mingled.                                                                                                In 2019 , scientists capture the image quantum entanglement first time.                                                     BBO  light passes through it. Beam splitter divides the light into two pairs. One light goes straight, another light goes another side. Like this iam sending pairs of photons and now changing the phase on one side  45° phase. Iam sending one electric field to another light backwards  sending another phase. Two lights goes same , then slowing the speed of one light which is called phase 0°, 45° , 90° . Like slowing this it affects another pair. If I rotate the one light to 90° phase another light also rotate to 90° . Like this sending en numbers of photons all are entangled. Studying this statistical correlation the value is , S= 2.4626 . It is more than two so bell was right quantum entanglement was possible.                                                                                       In this experiment entangled pairs as shor distance so the  detectors can change the photons equal to another photons to same angle.                                    So, we have  to increase the  distance between entangle pairs like one entangle pair in earth and other in moon this ha long distance  .                      Chinese scientists using satellite and sends 600 million entangle pair per second to earth. To two different telescope, distance between these two telescope is 1200km . Satellite sends one particle to one telescope and another particle to another telescope. Among 600millon pairs of photons 1000 only reaches the earth . One telescope receives an photons which has some property and another telescope receives an photons which has same property. And statistical  for this entangle pair is 2.37 . This also above 2 , so bell was true.                                                                     In 2018 . Measuring the light from quasars ( light beaming astronomical object center in milky Way galaxy). Entangle pair produced in earth. One photons sends to one telescope and another photon to another telescope. One photon going to one telescope the light from quasars which is 7.8 billion light years away. Iam setting my detectors in orientation. Scientists not deciding, how to keep the detectors in this direction. Studying 17,000 entangled pair. The statistical limit was above the bell's inequality limit. By this quantum entanglement is real.