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    Area of Science:

    • Quantum Information Science
    • Quantum Cryptography
    • Optical Communication

    Background:

    • Continuous-variable quantum key distribution (CV-QKD) is a method for secure key exchange.
    • Transmitting both the quantum signal and local oscillator (LO) over an insecure channel limits CV-QKD distance and complexity.
    • High-speed quantum measurements are crucial for practical, high-bit-rate QKD systems.

    Purpose of the Study:

    • To demonstrate a simplified and high-speed CV-QKD system.
    • To overcome the limitations of transmitting the LO through an insecure channel.
    • To achieve high-bit-rate CV-QKD over significant fiber distances.

    Main Methods:

    • A 100-MHz continuous-variable quantum key distribution (CV-QKD) experiment was conducted over a 25-km fiber channel.
    • A "locally" generated local oscillator (LO) was used, eliminating the need to transmit it through the quantum channel.
    • A 1-GHz shot-noise-limited homodyne detector was implemented for high-speed quantum measurements.
    • A secure phase compensation scheme was developed to minimize excess noise.

    Main Results:

    • Successful 100-MHz CV-QKD operation over a 25-km fiber link was achieved.
    • The system operated without transmitting the LO through the quantum channel.
    • High-speed quantum measurements were performed using a 1-GHz homodyne detector.
    • The phase compensation scheme effectively maintained low excess noise levels.

    Conclusions:

    • The proposed method significantly simplifies high-bit-rate CV-QKD for longer transmission distances.
    • Eliminating the need to transmit the LO over the insecure channel enhances security and practicality.
    • This approach offers a more feasible path towards widespread adoption of high-speed CV-QKD.