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Pancharatnam-Berry geometric phase memory based on spontaneous parametric down-conversion.

Wen-Rong Qi, Rui Liu, Ling-Jun Kong

    Optics Letters
    |February 1, 2020
    PubMed
    Summary
    This summary is machine-generated.

    This study demonstrates non-dynamic phase memory using Pancharatnam-Berry geometric phase in nonlinear optics. Researchers controlled photon pair interference by introducing geometric phase to pump light.

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    Area of Science:

    • Quantum optics
    • Nonlinear optics
    • Geometric phase

    Background:

    • Phase memory in spontaneous parametric down-conversion (SPDC) typically involves dynamic phase.
    • Non-dynamic phase memory in SPDC has not been previously reported.
    • Pancharatnam-Berry (PB) geometric phase offers a novel approach to phase manipulation.

    Purpose of the Study:

    • To investigate the memory of non-dynamic phase using Pancharatnam-Berry geometric phase.
    • To explore PB geometric phase memory in induced coherence and NOON states.
    • To demonstrate control over two-photon interference using geometric phase.

    Main Methods:

    • Utilized a cascaded nonlinear crystal scheme for induced coherence.
    • Generated photon pairs via spontaneous parametric down-conversion.
    • Established a NOON state ($N=2$) by blocking idler photons.
    • Introduced Pancharatnam-Berry geometric phase to the pump beam.

    Main Results:

    • Successfully acquired Pancharatnam-Berry geometric phase in the physical system.
    • Demonstrated induced coherence when idler photons were indistinguishable.
    • Observed that the first-order interference of two-photon states or signal photons can be controlled by the PB geometric phase.
    • Established a NOON state ($N=2$) for phase memory exploration.

    Conclusions:

    • The study establishes non-dynamic phase memory in a physical system.
    • Pancharatnam-Berry geometric phase can be used to control the phase of down-converted photons.
    • This work may enable precise phase control in quantum optical experiments.