# Why Is Entangled Photons Pair Difficult To Produce?

It is not difficult to produce entangled photon pair. These entangled photon pair depends on the interdependent quantum states and are produced ony when the pair emit identical photons. But it is not so easy to decide which pair of photons will emit identical photons. Also, monitoring of these photons in the device becomes difficult as the variations in the structures of these photons takes place at the microscopic level resulting in change in overall emission frequencies. Therefore, it can be said that it is difficult to produce entangled photons. It is not difficult to produce an entangled photon pair. These entangled photon pair depends on the interdependent quantum states and are produced only when the pair emit identical photons. But it is not so easy to decide which pair of photons will emit identical photons. Also, monitoring of these photons in the device becomes difficult as the variations in the structures of these photons take place at the microscopic level resulting in a change in overall emission frequencies. Therefore, it can be said that it is difficult to produce entangled photons.