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Quantum interference in anti-parity-time symmetric coupled waveguide system.

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    Quantum interference in anti-parity-time (anti-PT) systems is explored using coupled waveguides. Researchers observed unique bosonic and fermionic behaviors, including loss-induced transparency and violated statistical rules in anti-PT systems.

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    Area of Science:

    • Quantum optics
    • Non-Hermitian physics
    • Waveguide theory

    Background:

    • Parity-time (PT) symmetry and anti-parity-time (anti-PT) symmetry are crucial concepts in non-Hermitian quantum mechanics.
    • Quantum interference phenomena are fundamental to quantum information processing and understanding particle statistics.

    Purpose of the Study:

    • To theoretically demonstrate quantum interference in an anti-PT symmetric system.
    • To investigate the behavior of bosons and fermions under anti-PT symmetry with and without birefringence.
    • To explore potential applications in quantum devices.

    Main Methods:

    • Theoretical analysis of quantum interference in coupled waveguides.
    • Calculation of coincidence probabilities for two-photon states simulating bosons and fermions.
    • Investigation of systems with and without waveguide birefringence.

    Main Results:

    • Coincidence probabilities for bosons and fermions decrease exponentially with propagation distance due to dissipation in both unbroken and broken anti-PT symmetry regions.
    • Loss-induced transparency and violation of Hermitian statistical rules (bosonic antibunching) observed for bosons.
    • At the exceptional point (EP), bosonic and fermionic coincidence probabilities equalize. Birefringence leads to different probabilities in broken/unbroken anti-PT regions.
    • Hong-Ou-Mandel dip observed for bosons in the broken anti-PT phase.

    Conclusions:

    • The study provides a novel method for manipulating quantum interference in anti-PT symmetric systems.
    • Observed phenomena like loss-induced transparency and bosonic antibunching highlight unique quantum behaviors in non-Hermitian systems.
    • The findings offer potential for developing quantum devices utilizing anti-PT symmetric quantum mechanics.