“Vijay and colleagues used continuous feedback control to keep a quantum bit (qubit) cycling between its ground and excited state. The process is analogous to a car driver trying to make one lap every minute on a circular racetrack by monitoring the position of the car on the track and comparing it with the position of the second hand of a clock on a tower by the start/finish line. In this illustration, the car is slightly ahead of where it should be, so the driver should ease off the accelerator. In this manner, the driver can continuously compensate for any fluctuations affecting the car’s speed. In a system that dissipates power, such as the qubit, fluctuations are inevitable, and are also introduced by the measurement of the qubit’s state. In this analogy, the qubit’s excited state is equivalent to the car being at a point (blue flag) that is diametrically opposite to the start/finish line, which corresponds to the ground state.”

“Vijay and colleagues used continuous feedback control to keep a quantum bit (qubit) cycling between its ground and excited state. The process is analogous to a car driver trying to make one lap every minute on a circular racetrack by monitoring the position of the car on the track and comparing it with the position of the second hand of a clock on a tower by the start/finish line. In this illustration, the car is slightly ahead of where it should be, so the driver should ease off the accelerator. In this manner, the driver can continuously compensate for any fluctuations affecting the car’s speed. In a system that dissipates power, such as the qubit, fluctuations are inevitable, and are also introduced by the measurement of the qubit’s state. In this analogy, the qubit’s excited state is equivalent to the car being at a point (blue flag) that is diametrically opposite to the start/finish line, which corresponds to the ground state.”

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    This is amazing.
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