Current students


Section: Electronics

Major Research topic:
Design and characterization of electronics for cryogenic integration with quantum devices

The development of quantum devices operating at cryogenic temperature (below 1 K) requires auxilary cryogenic electronics. The small distance between the classical and quantum hardware reduces the wiring complexity to room temperature instruments, the associated heat load, the parassitic capacitances.
The most attractive field of application is the quantum computing based on superconductive or semicondutor qubits. Quantum alghoritms promise to solve problems that can not be managed by the classical ones, at least in reasonable time, using quantum phenomena (e.g. superposition, entanglement, interference). Qubits exhibit their quantum nature only at very low temperature (below 20 mK) and in a very low noise environment which must take into account also the noise of the electronics needed to control and readout the qubits themselves. Today this classical elctronic platform operatates at room temparture occupaying an entire room. Therefore, the future of this tecnology necessarily pass through the development of an electronics platforn that must operate at cryogenic temperature. Infact, the benefits offered by this solution will allow to integrate a large number of qubits. Furthermore, the close proximity between the quantum and classical hardware makes possible to increase the resolution and the speed of reading operations. In this context, I am developing an acquisition chain in order to read multiple quibits with high resolution and high bandwidth. Moreover the limited cooling power of refrigerator requires a readout platform power saving. 
The design of a cryogenic electronic will be based on a cryogenic model of the CMOS technology adopted. Infact, the design tool kit offered by the foundary is valid in a limited temperature range. It will be necessary a characterization and modelling session of the CMOS technology.
In particular, the design and development of cryogenic amplifiers opens the way for high resolution measurmeents of different quantum devices. Cyogenic amplifiers make possible to investigate the physical nature of quantum phenomena in silicon quantum dots, they also find application in condensated matter physics. Cryogenic electronics operating at temperature below 1 K will be used for measuraments in physical experiments of supercondutors.
Finally, this aknowledge acquired in cryogenic electronics will help us to develop an hybrid superconductive/silicon electronics based on SQUID and JJ. This "marriage" promises to achieve a very low power electronics in the range of 10-100 GHz.