In particular, feeding a photon pair into two input ports of a Mach–Zehnder interferometer yields a two-photon NOON state, thus producing double-density fringes 12.

Quantum Tunneling: A quantum mechanical phenomenon where a particle passes through a potential barrier that it classically could not surmount. Triple-NOON States: Highly entangled quantum states ...

potentially revolutionizing everything from quantum sensing to secure communication networks. Lee, D., et al. (2024) NOON-state interference in the frequency domain. Light: Science & Applications.