Researchers have demonstrated the ability to control the spin state of a single electron in a double quantum dot using electron spin resonance (ESR). By applying a continuous-wave oscillating magnetic field, they observed electron spin resonance in spin-dependent transport measurements. Short bursts of this magnetic field were used to coherently control the electron spin, resulting in eight oscillations (Rabi oscillations) during a microsecond burst. This experiment shows the feasibility of using single-electron spins in quantum dots as quantum bits. Quantum computing relies on quantum mechanical superposition and entanglement to solve problems faster than classical computers. However, controlling fragile quantum states is challenging. Semiconductor quantum dots, with their robustness against decoherence, are promising for quantum computing. Recent advances have enabled the isolation of single electrons in quantum dots and reliable initialization of their spin states. Spin states in quantum dots have long coherence times, making them suitable for quantum information processing. The use of a double quantum dot system allows for spin detection without requiring the electron spin Zeeman splitting to exceed the temperature of the electron reservoirs. This enables operation at lower magnetic fields and reduces technical challenges. The experiment also demonstrated the coherent exchange of two electron spins in a double dot system and the free evolution of a single electron spin about a static magnetic field. The study shows that driven coherent spin rotations (Rabi oscillations) can be achieved in a double quantum dot system. This is crucial for universal quantum computation with spins in dots. The results demonstrate the ability to control the spin state of a single electron via ESR, with the spin state detected through electron transitions between dots. The experiment also revealed the role of nuclear spin baths in ESR detection and the importance of minimizing electric field effects. Theoretical models were used to understand the amplitudes and decay times of the oscillations. The results show that the spin states evolve according to the applied magnetic field and nuclear field fluctuations. The experiment also demonstrated the time evolution of the spin states during RF bursts and the quantum gate fidelity of the spin rotations. The study highlights the potential of quantum dots for quantum computing, with the ability to control single-electron spins through ESR. The results open new opportunities for quantum information processing, including measuring violations of Bell's inequalities and implementing simple quantum algorithms. The findings contribute to the development of scalable quantum computing systems using semiconductor quantum dots.Researchers have demonstrated the ability to control the spin state of a single electron in a double quantum dot using electron spin resonance (ESR). By applying a continuous-wave oscillating magnetic field, they observed electron spin resonance in spin-dependent transport measurements. Short bursts of this magnetic field were used to coherently control the electron spin, resulting in eight oscillations (Rabi oscillations) during a microsecond burst. This experiment shows the feasibility of using single-electron spins in quantum dots as quantum bits. Quantum computing relies on quantum mechanical superposition and entanglement to solve problems faster than classical computers. However, controlling fragile quantum states is challenging. Semiconductor quantum dots, with their robustness against decoherence, are promising for quantum computing. Recent advances have enabled the isolation of single electrons in quantum dots and reliable initialization of their spin states. Spin states in quantum dots have long coherence times, making them suitable for quantum information processing. The use of a double quantum dot system allows for spin detection without requiring the electron spin Zeeman splitting to exceed the temperature of the electron reservoirs. This enables operation at lower magnetic fields and reduces technical challenges. The experiment also demonstrated the coherent exchange of two electron spins in a double dot system and the free evolution of a single electron spin about a static magnetic field. The study shows that driven coherent spin rotations (Rabi oscillations) can be achieved in a double quantum dot system. This is crucial for universal quantum computation with spins in dots. The results demonstrate the ability to control the spin state of a single electron via ESR, with the spin state detected through electron transitions between dots. The experiment also revealed the role of nuclear spin baths in ESR detection and the importance of minimizing electric field effects. Theoretical models were used to understand the amplitudes and decay times of the oscillations. The results show that the spin states evolve according to the applied magnetic field and nuclear field fluctuations. The experiment also demonstrated the time evolution of the spin states during RF bursts and the quantum gate fidelity of the spin rotations. The study highlights the potential of quantum dots for quantum computing, with the ability to control single-electron spins through ESR. The results open new opportunities for quantum information processing, including measuring violations of Bell's inequalities and implementing simple quantum algorithms. The findings contribute to the development of scalable quantum computing systems using semiconductor quantum dots.