Rapid Measurement of Quantum Systems Using Feedback Control
Joshua Combes, Howard M. Wiseman, Kurt A. Jacobs · Physical Review Letters · 2008
We introduce a feedback control algorithm that increases the speed at which a measurement extracts information about a d-dimensional system by a factor that scales as d(2). Generalizing this algorithm, we apply it to a register of n qubits and show an improvement of O(n). We derive analytical bounds on the benefit provided by the feedback and perform simulations that confirm that this speedup is achieved.