Quantum enhancement effects of macroscopic quantum entangled states

Abstract: The atomic system has reflection symmetry, parity, and atomic stimulated radiation amplified by a parallel plane resonant cavity, can generate macroscopic photons entangled state[4].
 It is a quantum entangled state of 2N photons with a certain parity, a total momentum of zero, a certain energy, and a certain angular momentum. Observing it in time and space has uncertainty and randomness. According to the Heisenberg uncertainty principle, its energy (frequency) and momentum are completely determined. The measurement accuracy can reach the Heisenberg quantum limit and has a quantum 2N enhancement effect (2N is the number of entangled photons).
The probability distribution P2N （t） of ∣Ф2NI > and its fourier transform P2N （w-w0 ）were measured through experiments, and the experimental results were in line with theoretical expectations. And the lifetime of macroscopic photons entangled state was observed, which also has a 2N enhancement factor. The experimental results are consistent with theoretical expectations.