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    Area of Science:

    • Quantum optics
    • Non-Hermitian physics
    • Photonics

    Background:

    • Exceptional points (EPs) are singularities in non-Hermitian systems, crucial in optics.
    • EP signatures are typically studied with classical light, showing changes in photon decay.
    • Nonclassical light can obscure EP characteristics due to quantum interference.

    Purpose of the Study:

    • To investigate the impact of nonclassical light on exceptional points in parity-time (PT) optical systems.
    • To determine if quantum interference can hide EP-induced phase transitions.
    • To explore how changing particle statistics affects EP signatures.

    Main Methods:

    • Utilizing a passive parity-time (PT) optical coupler.
    • Probing the system with polarization-entangled two-photon states.
    • Analyzing the photon decay law and phase transitions under varying effective particle statistics (bosonic to fermionic).

    Main Results:

    • Quantum interference from two-photon states can obscure the characteristic signatures of EPs.
    • The EP phase transition, normally a sharp change in photon decay, is smoothed out.
    • As effective particle statistics shift from bosonic to fermionic, the EP signature effectively disappears.

    Conclusions:

    • Exceptional points in optical systems are sensitive to the quantum nature of light.
    • Nonclassical light, specifically two-photon states, can mask EP-induced phenomena.
    • The transition from bosonic to fermionic statistics provides a novel way to control or hide EPs.