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    We developed compact quantum circuits for deterministic quantum computing using electron-spin qubits. These circuits, including CNOT, Toffoli, and Fredkin gates, achieve 100% success probability with single photons.

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    Area of Science:

    • Quantum Computing
    • Cavity Quantum Electrodynamics
    • Quantum Information Science

    Background:

    • Deterministic quantum computing requires efficient and reliable quantum gates.
    • Electron-spin qubits in quantum dots are promising candidates for quantum computation.
    • Optical microcavities enhance light-matter interactions for quantum control.

    Purpose of the Study:

    • To design compact and deterministic quantum circuits for universal quantum gates.
    • To utilize cavity quantum electrodynamics for efficient quantum gate operations.
    • To demonstrate the feasibility of these gates in both weak and strong coupling regimes.

    Main Methods:

    • Exploiting giant optical Faraday rotation induced by single-electron spins in quantum dots within optical microcavities.
    • Implementing CNOT, Toffoli, and Fredkin gates using single-photon input-output processes.
    • Designing circuits that do not require additional electron-spin qubits.

    Main Results:

    • Achieved 100% success probability for quantum gates in principle.
    • Developed simple, economic, and compact quantum circuits.
    • Demonstrated gate operation in both weak and strong coupling regimes.
    • Confirmed experimental feasibility.

    Conclusions:

    • Presented a novel approach for deterministic quantum computing using electron-spin qubits.
    • Highlighted the advantages of using cavity quantum electrodynamics for quantum gate implementation.
    • The proposed schemes are practical and efficient for building quantum processors.