INSTITUCIONAL SEMINAR
Efficient Transmission of Quantum States in Qubit Arrays
On Wednesday, July 31, 2024, the seminar entitled “Efficient Transmission of Quantum States in Qubit Arrays” was held in the graduate classroom of the Faculty of Exact, Natural Sciences and Surveying of UNNE. At this event, Dr. Alejandro Ferron addressed quantum state transfer, a fundamental aspect for the implementation of quantum information processing (QIP) and the development of related technologies.
The speaker provided valuable insights into quantum transmission and its application in the next generation of technologies. Quantum entanglement and the manipulation of superconducting qubits are exciting areas that promise to revolutionize computing and communication.
Since Bose’s pioneering work in 2003, where the transfer of states in quantum spin chains (Heisenberg) was studied, this field has experienced significant growth. Bose introduced a simple transfer protocol and managed to quantify the performance of spin chains as communication channels. Efficiency in the transmission of quantum states has become a highly relevant topic in recent years, especially driven by recent technological advances.
The meeting enabled discussion on the possibility of transmitting states in spin chains. Different couplings were demonstrated to improve the efficiency of chain transmission. In addition, the experimental feasibility of implementing spin chains was analyzed and experimental protocols were studied that would allow the efficient transmission of quantum states in arrangements of atoms.
One of the promising approaches is the use of magnetic atoms in nanodevices. These devices can be designed using scanning tunneling microscopes (STM), which allow the precise manipulation of atoms on an arbitrary surface. Using radiofrequency (RF) voltages, it is possible to coherently control the spins of these atoms. Furthermore, the readout of the spin states is achieved by the polarized tunneling current between the microscope tip and the sample surface.
Dr. Alejandro Ferron, whose abbreviated resume is presented below, has contributed significantly to research in nanodevices and applications related to Quantum Information and Spintronics. His career includes postdoctoral stays at the Bariloche Atomic Center and the International Iberian Nanotechnology Laboratory in Braga, Portugal.
Short CV of Dr. Alejandro Ferron:
· Bachelor of Physics (FaMAF-UNC, 2003)
· PhD in Physics (CONICET, 2009)
· Scientific Researcher (CIC, CONICET)
· Full-time Professor
· Researcher at the Institute of Modeling and Technological Innovation (IMIT, CONICET-UNNE)
Since 2012, he has been involved in teaching and research tasks at IMIT and the Faculty of Exact and Natural Sciences (FaCENA). In September 2013, he moved to the International Iberian Nanotechnology Laboratory in Braga, Portugal, for a two-year postdoctoral stay focusing on topics related to condensed matter and spintronics. During this stay, he was promoted within the CIC to associate researcher. In September 2015, he returned to IMIT and FaCENA in Corrientes, where he has continued to work on topics related to control in nanostructured nanodevices. His research has benefited from active collaborations with institutions in Córdoba, Bariloche and Portugal.
In November 2019, he was again promoted within the CIC to independent researcher. Throughout his career, he has published more than 30 articles in international peer-reviewed journals, including:
· “Engineering the Eigenstates of Coupled Spin-Atoms on a Surface” (Physical Review Letters, 119, 227206, 2017)
· “Hyperfine Interaction of Individual Atoms on a Surface” (Science, 362, 336-339, 2018)
· “Exchange Mechanism for Electron Paramagnetic Resonance of Individual Adatoms” (Physical Review B, 96, 205420, 2017)
· “Tailoring Population Inversion in Landau-Zener-Stückelberg Interferometry of Flux Qubits” (Physical Review Letters, 109, 237005, 2012)
· “Optimizing Tip-Surface Interactions in ESR-STM Experiments” (Physical Review B, 107, 155406, 2023)