![]() ![]() This discovery was a major first step and was followed by the emergence of a parallel research discipline in the 1980s that sought to adapt the concepts and numeric tools from control engineering to the strictures of quantum-coherent devices. Then, in 1950, Erwin Hahn demonstrated that an early quantum-control protocol now known as the Hahn echo could mitigate the impacts of magnetic field inhomogeneities on spectroscopic resolution. In those disciplines, hardware imperfections limited the ability to spectroscopically characterize molecules. The field of quantum control largely owes its existence to decades of research in nuclear magnetic resonance and electron paramagnetic resonance, in which semiclassical magnetizations formed from nuclear or electronic spins are manipulated using pulses of resonant RF or microwave radiation. It guides researchers in gaining information about system dynamics through measurements and enabling useful performance in computing, sensing, and metrology. Quantum control is a discipline that addresses the following question How can systems that obey the laws of quantum mechanics be efficiently manipulated to create desired behaviors? Ultimately, quantum control is concerned with how the classical world interacts with quantum devices. In this short overview we provide insight into the foundations of quantum control and its role in the quantum tech industry. Q-CTRL is using quantum control to solve the hardest problems facing quantum technology, improving hardware performance and accelerating pathways to useful quantum computers and other devices. Fast forward over 100 years and, once again, control is the linchpin of an emerging industry - the quantum technology industry. Which constitutes another original contribution of this dissertation.Embracing the importance of control theory was integral to making flight a reality. ![]() The approximate controllability of the systems under study is proven using aĬontrollability result by T. Schrödinger equation with time-dependent boundary conditions is addressed. The problem of controllability, the problem of existence of solutions for the Generalization of quantum grahs) is introduced. Method, a family of boundary control systems on Quantum Circuits (a For showing the viability of the Quantum Control at the Boundary Which makes one to expect that it may help maintaining the quantumĬorrelations. Manipulation and, eventually, its control. Hence, a modification of suchīoundary conditions modifies the state of the system allowing for its On the boundary conditions imposed on it. Spectrum of a quantum system, for instance an electron moving in a box, depends Quantum system by directly interacting with it through an external field, theĬontrol is achieved by manipulating the boundary conditions of the system. The Quantum Control at the Boundary approach is Systems need to be kept at very low temperatures and the interactions have toīe performed very fast. ![]() System in this way, due to the complications of manipulating a system made ofįew particles while maintaining the quantum correlations. Some technological difficulties appear when controlling a quantum The standardĪpproach to quantum control bases on the use of an external field to manipulate Download a PDF of the paper titled Quantum Control at the Boundary, by Aitor Balmaseda Download PDF Abstract: This dissertation presents and prove the viability of a non-standard methodįor controlling the state of a quantum system by modifying its boundaryĬonditions instead of relying on the action of external fields. ![]()
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