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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Maximal quantum Fisher information for phase estimation without initial parity.

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    Photon losses in Mach-Zehnder interferometers limit phase accuracy. This study analyzes precision limits for coherent and superposition states, offering strategies to restore accuracy even with photon loss.

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    Area of Science:

    • Quantum optics
    • Quantum metrology

    Background:

    • Mach-Zehnder interferometers are crucial for quantum phase estimation.
    • Photon losses degrade phase accuracy in these devices.

    Purpose of the Study:

    • To analyze the precision limit of phase estimation in Mach-Zehnder interferometers.
    • To investigate the impact of photon losses and propose mitigation strategies.

    Main Methods:

    • Utilizing coherent states and superpositions of coherent states as input.
    • Deriving a general analytical expression for quantum Fisher information.
    • Analyzing sensitivity behaviors under photon loss scenarios.

    Main Results:

    • Established phase-matching conditions and optimal initial parity.
    • Quantified the impact of symmetric and asymmetric photon losses.
    • Developed specific strategies to restore phase accuracies.

    Conclusions:

    • The study provides a comprehensive understanding of phase precision limits in Mach-Zehnder interferometers.
    • Proposed methods can enhance phase estimation accuracy despite photon losses.