Editing Glossary (section)

===EPR Pairs===
EPR pairs refer to the pairs of particles with a conjugate physical property such as angular momentum. This concept has been introduced for the first time by the EPR (Einstein–Podolsky–Rosen) paradox which is a thought experiment challenging the explanation of physical reality provided by Quantum Mechanics.
The particles that have been used in the EPR paradox had perfect correlation in such a way that measuring a quantity of a particle A will cause the conjugated quantity of particle B to become undetermined, even if there was no contact, no classical disturbance. A two party quantum state with the above property can be described with the following state:<br/>
<math>|\Phi^+\rangle = \frac{1}{\sqrt{2}} (|00\rangle + |11\rangle)</math><br/>
This is one of the Bell states.