Speaker | Laura Bellentani |
Affiliation | Unimore and Cnr Nano S3 |
Date | 2021-09-09 |
Time | 15:00 |
Venue | |
Host | Massimo Rontani |
Among the possible frameworks to encode quantum information, semiconductor-based implementations present the highest potential in terms of scalability and compatibility with the current nanoelectronics industry. Under the umbrella of EU-H2020 projects, IQubits[1] focuses the technological effort on the formation of single-electron/hole quantum dots in traditional Si and SiGe CMOS devices, where spin qubits are monolithically integrated with the control-readout circuitry on the same die. The partnership involves physicists and engineers from CNR-NANO-S3 in Modena, the University of Toronto in Canada, the Applied Materials company in Reggio Emilia, the Aarhus University in Denmark, the National Institute for Research and Development in Microtechnologies in Romania, and the Foundation for Research and Technology in Greece.
Si has been recognized as an excellent host material for quantum computing devices thanks to the weak hyperfine interaction between the spin qubit and the nuclear spins, which is the main source of decoherence in III–V compound semiconductors. The experimental characterization of a 22-nm FDSOI pMOSFETs[2] has recently proved QD formation in the Si/SiGe channel up to a temperature of 1.2 K. In these transistors, confinement energies of the QD can be controlled by top gates, while the backgate formed in the Si substrate tunes the interdot coupling. Further, fast qubit operations and device scalability are fostered by the possibility to implement the EDSR protocol for a fully-electrical control of the spin and by the feasibility of readout schemes based on gate reflectometry.
This talk will address the work of the CNR-Nano unity within IQubits consortium to theoretically demonstrate the formation and manipulation of hole spin qubits in Si MOSFETs. We implemented a multi-scale approach for qubit simulation based on the 6x6 k.p method and full configuration interaction technique to characterize single and double QDs in the one- and few-hole regime. Our first results concern the characteristic Larmor and Rabi frequencies of single-hole spin-qubit operations in scaled prototypes of Si pMOSFETs[3]. Future perspectives involve the theoretical modeling of intra- e inter-band Coulomb integrals for holes in Silicon nanostructures and the simulation of double quantum dot systems.
References:
[1] https://www.iqubits.eu/
[2] S.Bonen et al., IEEE Electron Device Letters 40, 127-130, (2019)
[3] Bellentani et al., arXiv:2106.04940 (2021)
See the SLIDES of the presentation.
Istituto Nanoscienze
Consiglio Nazionale delle Ricerche
PEC: protocollo.nano@pec.cnr.it
Partita IVA 02118311006
Piazza San Silvestro 12
56127 Pisa, Italy
phone +39 050 509418
fax +39 050 509550
Istituto Nanoscienze Consiglio Nazionale delle Ricerche
Piazza San Silvestro 12, I
56127 Pisa
phone +39 050 509525/418
fax +39 050 509550
via Campi 213/A, I
41125 Modena 7
phone +39 059 2055629
fax +39 059 2055651″
Cookie | Duration | Description |
---|---|---|
cookielawinfo-checkbox-analytics | 11 months | This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Analytics". |
cookielawinfo-checkbox-functional | 11 months | The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". |
cookielawinfo-checkbox-necessary | 11 months | This cookie is set by GDPR Cookie Consent plugin. The cookies is used to store the user consent for the cookies in the category "Necessary". |
cookielawinfo-checkbox-others | 11 months | This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Other. |
cookielawinfo-checkbox-performance | 11 months | This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Performance". |
viewed_cookie_policy | 11 months | The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. It does not store any personal data. |