Title: Programmable quantum matter in semiconductor electronics

Speaker: Krzysztof Pomorski (University College Dublin)

Abstract: Rapid developments in semiconductor electronics allows achieving the transistors with short channels and it opens the new epoch allowing for design of devices working in single electron regime. It is very attractive in implementation of various nanostructures having different functionality both in information processing and in sensing, having high logical density and consuming small amount of power as well as having high level of integration with classical semiconductor electronics. What is more single electron semiconductor electronics enters cryogenic regime as in temperature range of 4 Kelvin or lower and due to electric field effect activation of electric carriers instead of temperature based activation it preserves its functionality with small renormalization of transport parameters. The most spectacular expectation and technological goal arising from cryogenic semiconductor electronics is the implementation of large scale quantum computer implemented [1-4] in technology basing on electrostatic position based qubits proposed by Fujisawa, Petta and others [3-4,1-2] together with network of quantum sensors. Very particular and universal implementation comes by use of 2 dimensional networks of interconnected semiconductor transistors. In such way one can implement programmable quantum neural networks, detectors of electric and magnetic field and it is possible to implement quantum artificial intelligence as well as quantum Artificial Life. At very end of this scheme there is possibility of constructing the interface between semiconductor and superconducting quantum computer that is interface between Josephson junction and semiconductor electrostatic qubit. We also present the scheme of N interacting electrons on graphs of arbitrary topology in tight binding approach [7]. Various physical phenomena as quantum phase transition [5-7] are expected to take place.

Time: Tuesday, 1 October 2019, 2.30pm

Location: Lecture Room, 1st Floor, School of Theoretical Physics, DIAS,
10 Burlington Road, Dublin 4