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Quasi-light Storage for Optical Data Packets
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QAM quantum stream cipher using digital coherent optical transmission.

Masataka Nakazawa, Masato Yoshida, Toshihiko Hirooka

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    This study introduces Quantum Stream Cipher (QSC) with Quadrature Amplitude Modulation (QAM) for enhanced optical communication security. The novel QAM/QSC technique significantly boosts encryption robustness against eavesdropping compared to ASK or PSK/QSC methods.

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    Area of Science:

    • Quantum Information Science
    • Optical Communication Security
    • Cryptography

    Background:

    • Existing Quantum Stream Cipher (QSC) methods using Amplitude Shift Keying (ASK) or Phase Shift Keying (PSK) offer limited security against sophisticated eavesdropping.
    • The need for advanced encryption techniques in optical communication is critical to protect sensitive data transmission.

    Purpose of the Study:

    • To present a novel Quantum Stream Cipher (QSC) utilizing Quadrature Amplitude Modulation (QAM) to enhance the security of optical data transmission.
    • To demonstrate the superior encryption capabilities of QAM/QSC compared to ASK/QSC and PSK/QSC.

    Main Methods:

    • Developed a Quantum Stream Cipher (QSC) incorporating Quadrature Amplitude Modulation (QAM) to encode multi-bit data within a single symbol.
    • Simultaneously employed amplitude and phase encryption of the light beam.
    • Conducted a 16 QAM/QSC experiment at 10 Gbit/s over 160 km using digital coherent optical transmission.

    Main Results:

    • Successfully implemented a 16 QAM/QSC system, encrypting data within a large constellation (32x32 to 4096x4096 symbols).
    • Experimentally verified that the Number of Masked Signals (NMS) in quantum noise for QAM/QSC (Γ(QAM)) is significantly larger than for ASK/QSC (Γ(ASK)).
    • Achieved Γ(QAM) exceeding 10,000, indicating a substantial increase in security.

    Conclusions:

    • The proposed QAM/QSC technique offers a greatly increased level of security compared to ASK/QSC and PSK/QSC.
    • QAM/QSC demonstrates superior robustness against potential eavesdroppers in optical communication systems.
    • This advancement provides a more secure foundation for high-speed optical data transmission.