© Adrian RADU 2007
 
VERSIUNEA IN LIMBA ROMANA

Project: PN-III-P4-ID-PCE-2016-0122
Contract number: 35/2017
Funded by: UEFISCDI, România
Title: Nanostructures for quantum and plasmonic computing
Budget: 850.000 lei
Duration: 30 months, from 12.07.2017 to 31.12.2019
Coordinator: University of Bucharest
Project director: Prof.univ.dr. Daniela Dragoman
Contact: danieladragoman@yahoo.com

Summary:
The project addresses the problem of fast, reliable and accessible computation motivated by the fact that present-day classical Boolean computers are reaching rapidly their limits. Two alternative approaches based on new principles and architectures will be investigated in this multidisciplinary project: quantum and plasmonic computing, the objective being the development of novel and compact configurations of quantum and plasmonic logic gates and algorithms implemented using nanostructures.
This multidisciplinary project will investigate
(i) quantum computing configurations in ballistic two-dimensional electron gases/materials, focusing on developing compact configurations for quantum algorithms working at room-temperature and/or using current measurements as readout procedures.
(ii) logic gates in the plasmonic slot configuration, which involves gap surface plasmons propagating along narrow dielectric gaps in metals (of the order of 100 nm) that can be fabricated with standard technologies.
(iii) tunable plasmonic slot logic circuits with enhanced functionality, in which two-dimensional materials with gate-tunable refractive index influence the outcome of nearby plasmonic circuits.
Team:
  1. Prof. Univ. Dr. Daniela DRAGOMAN - Project director
  2. Prof. Univ. Dr. Lucian ION
  3. Conf. Dr. George-Alexandru NEMNES
  4. Conf. Dr. Vlad ANTOHE
  5. Lect. Dr. Adrian RADU
  6. Lect. Dr. Sorina IFTIMIE
  7. Master/PhD student - Vacant
Expected results in 2017
Objectives: Study of ballistic nanostructures configurations for quantum algorithms using Y-junctions as qubits
Activities:
  • Development of a computing algorithm able to simulate ballistic nanostructures with arbitrary configurations, by extending the computing algorithm developed in the MDEO center to handle ballistic nanostructures with nonuniform sections and/or curvatures
  • Development of a ballistic configuration for implementing quantum circuits using Y-junction qubits, by applying the computing algorithm developed in the previous activity to a Y-junction and by designing a suitable configuration for implementing logic gates in ballistic nanostructures
Scientific Report 2017
Expected results in 2018
Objectives: Study of ballistic nanostructures configurations for quantum algorithms using edge states, spins and valley states
Activities:
  • Development of a ballistic configuration for implementing quantum circuits using edge states, via the investigation of logic gate configurations employing spin qubits
  • Investigation of novel quantum computing configurations based on spins in nanostructures with gate-controlled spin-orbit Rashba coupling, via the study of a computing configuration with qubits implemented by spin states in ferromagnetic nanowires or in Mach-Zehnder polarizing beam splitters, which performs logic operations
  • Development of a correspondence between qubit implementations with spin and valley states, by generalizing the correspondence between the spin and valley degrees of freedom with the aim of implementing computing configurations
  • Investigation of novel quantum computing configurations using valley states, by employing the correspondence developed in the previous activity for designing quantum computing configurations with valley states inspired by existing ones with spin qubits
Scientific Report 2018
Expected results in 2019
Objectives: Design, fabrication and characterization of plasmonic logic gates in slot waveguides
Activities:
  • Development of a computing algorithm for the investigation of electromagnetic wave propagation in curved and nonuniform plasmonic slot waveguides, by adapting the R matrix computing algorithm developed for quantum states to the simulation of electromagnetic wave propagation
  • Development and optimization of logic circuits in plasmonic slot waveguides, by optimizing existing or novel plasmonic logic circuits with the aim of finding an optimal configuration from the experimental point of view
  • Investigation of gate-controlled logic circuits in plasmonic slot waveguides, by investigating the possibility of controlling logic circuits in plasmonic slot waveguides via gates applied on top of bidimenional materials positioned above the waveguides
  • Determination of the optimal parameters for fabricating narrow slots by local oxidation nanolithography and/or electron beam lithography, by employing these two fabication procedures and comparing the resulted plasmonic structures from the points of view of tollerance and reproducibility
  • Fabrication and characterization of logic gates on plasmonic slot waveguides, by fabricating and characterizing structures simulated before using the optimum fabrication method identified in the previous activity
Scientific Report 2019
Publications related to the project:

a) articles in ISI journals:
  1. G. Nemnes, T.L. Mitran, D. Dragoman - Ballistic transport in graphene Y-junctions in transversal electric field, Nanotechnology 29, 355202, 2018, https://iopscience.iop.org/article/10.1088/1361-6528/aaca43/meta
  2. D. Dragoman - Tunable fractional Fourier transform implementation of electronic wavefunctions in atomically thin materials, Beilstein J. Nanotechnol. 9, 1828-1833, 2018, https://www.beilstein-journals.org/bjnano/articles/9/174
  3. E. Vladescu, D. Dragoman - Reconfigurable plasmonic logic gates, Plasmonics 13, 2189-2195, 2018, https://link.springer.com/article/10.1007/s11468-018-0737-z
  4. A. Radu, S. Iftimie, D. Dragoman - Ballistic 3-port interferometric logic gates in the quantum Hall regime, Physica E 109, 144-151, 2019, https://www.sciencedirect.com/science/article/pii/S1386947718316497
  5. G.A. Nemnes, D. Dragoman - Reconfigurable quantum logic gates using Rashba controlled spin polarized currents, Physica E 111, 13-19, 2019, https://www.sciencedirect.com/science/article/pii/S1386947718317594
  6. D. Dragoman, E. Vladescu - Ring-shaped plasmonic logic gates, Plasmonics 14, 71-78, 2019, https://link.springer.com/article/10.1007/s11468-018-0779-2
  7. S. Iftimie, A. Radu, D. Dragoman - Reconfigurable quantum logic gates with gate-controlled Rashba spin-orbit coupling, submitted to Physica E
  8. Elena Vlădescu, Daniela Dragoman - Plasmonic slot waveguide circuits for pulse shaping, submitted to Applied Physics B
b) contributions to international conferences:
  1. G. A. Nemnes, T. L. Mitran, D. Dragoman - Electric field control in ballistic graphene Y-junctions, TIM 18 Physics Conf, 24-26 May 2018, Timişoara, România
  2. D. Dragoman, A. Dinescu, M. Dragoman - Configurations for quantum computing on graphene, 3rd International Workshop of Materials Physics, 29-30 May 2018, Bucharest, Romania (invited paper)
  3. G. A. Nemnes, T. L. Mitran, D. Dragoman - Ballistic transport in graphene Y-junctions, 18th International Balkan Workshop on Applied Physics and Materials Science (IBWAP 2018), 10-13, July, 2018, Constanţa, România
  4. D. Dragoman, E. Vladescu - Multiport ring-shaped plasmonic waveguides operating as logic gates, 18th International Balkan Workshop on Applied Physics and Materials Science (IBWAP 2018), 10-13, July, 2018, Constanţa, România
  5. V.-A. Antohe, S. Iftimie, A. Radu, L. Ion, D. Dragoman - On the fabrication and characterization of slot waveguides on silicon and aluminum, 18th International Balkan Workshop on Applied Physics and Materials Science (IBWAP 2018), 10-13, July, 2018, Constanţa, România
  6. S. Iftimie, A. Radu, V.-A. Antohe, L. Ion, D. Dragoman - Fabrication and characterization of slot waveguides for plasmonic logic gates, 12th International Conf. on Physics of Advanced Materials, 22-28 Sept. 2018, Heraklion, Greece
  7. G.A. Nemnes, D. Dragoman - Reconfigurable quantum logic gates using Rashba spin-orbit interaction, TIM 19 Physics Conf., 29-31 May 2019, Timisoara, Romania
  8. A. Radu, S. Iftimie, L. Ion, D. Dragoman - Ballistic 3-port interferometric logic gates in the quantum Hall regime, 19th International Balkan Workshop on Applied Physics and Materials Science (IBWAP 2019), 16-19 July 2019, Constanţa, România
  9. D. Dragoman, E. Vladescu - Plasmonic pulse shaping in slot waveguides, 19th International Balkan Workshop on Applied Physics and Materials Science (IBWAP 2019), 16-19 July 2019, Constanţa, România
  10. V.-A. Antohe, S. Iftimie, A. Radu, L. Ion, D. Dragoman - On the characterization of optical slot waveguides fabricated by AFM nano-indentation lithography, 19th International Balkan Workshop on Applied Physics and Materials Science (IBWAP 2019), 16-19 July 2019, Constanţa, România
  11. G.A. Nemnes, D. Dragoman - Reconfigurable quantum logic gates Reconfigurable quantum logic gates for neuromorphic computing, EMRS Fall Meeting 2019, 16-19 September 2019, Warsaw, Poland