Advances in sequential measurement and control of open quantum systems
For researchers in quantum science and technology, this work provides a unified framework for measurement and control of open quantum systems, though it is primarily a conceptual review without concrete numerical results.
This paper discusses sequential measurement and control schemes for open quantum systems, showing how repeated measurements and dynamical decoupling pulses can confine quantum dynamics, predict state transfer probabilities, and reconstruct environmental noise spectra, thereby advancing quantum science and technologies.
Novel concepts, perspectives and challenges in measuring and controlling an open quantum system via sequential schemes are shown. We discuss how similar protocols, relying both on repeated quantum measurements and dynamical decoupling control pulses, can allow to: (i) Confine and protect quantum dynamics from decoherence in accordance with the Zeno physics. (ii) Analytically predict the probability that a quantum system is transferred into a target quantum state by means of stochastic sequential measurements. (iii) Optimally reconstruct the spectral density of environmental noise sources by orthogonalizing in the frequency domain the filter functions driving the designed quantum-sensor. The achievement of these tasks will enhance our capability to observe and manipulate open quantum systems, thus bringing advances to quantum science and technologies.