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A study for the construction of a Quantum Information Processing Device using Doped Fullerenes and with the ReadOut of Single Electron Spin

Objective

This project will investigate the construction of a single-issue (non-ensemble), spin-based solid-state (SBSS), quantum information processing device using endohedral fullerenes. The Group V C60 endohedrals have been shown to be well suited to SBSS quantum computing with long spin lifetimes, large hyperfine couplings, and separate endohedrals spin-coupled via a magnetic dipole coupling. One of the primary obstacles to the construction of a single-issue SBSS device is the lack of a single electron spin readout. The goals of this project are (I) to investigate a variety of candidate single-spin readout techniques and develop an efficient readout technology primarily for use with endohedral fullerenes; and (II) to concurrently develop single-issue quantum computer implementations based on endohedral fullerenes which ultimately uses the developed readout technique to perform few-qubit single-issue quantum information processing. This project will investigate the construction of a single-issue (non-ensemble), spin-based solid-state (SBSS), quantum information processing device using endohedral fullerenes. The Group V C60 endohedrals have been shown to be well suited to SBSS quantum computing with long spin lifetimes, large hyperfine couplings, and separate endohedrals spin-coupled via a magnetic dipole coupling. One of the primary obstacles to the construction of a single-issue SBSS device is the lack of a single electron spin readout. The goals of this project are (I) to investigate a variety of candidate single-spin readout techniques and develop an efficient readout technology primarily for use with endohedral fullerenes; and (II) to concurrently develop single-issue quantum computer implementations based on endohedral fullerenes which ultimately uses the developed readout technique to perform few-qubit single-issue quantum information processing.

OBJECTIVES
The primary objective is to develop a single-issue (non-ensemble), quantum computing device using Group V endohedral fullerenes. The primary thrust of the project's work will be to develop an efficient single electron spin readout technology for use with endohedral fullerenes. The project will investigate the use of Nano SQUIDS, Single Molecule Spectroscopy, Magnetic Resonance Force Microscope, STM-ESR and Single Fullerene Transistors as a means of reading out the spin state of the endohedral electrons. In parallel, we will investigate globally and locally addressed quantum computing architectures through the development of an integrated ESR microresonator together with on-chip generation of ultra-high magnetic field gradients to allow frequency addressing of individual endohedrals. The ultimate goal of the project will be to demonstrate few-qubit quantum information processing using the developed readout techniques.

DESCRIPTION OF WORK
The project work is primarily in two parts. The first part will investigate a number of techniques focusing on the ultimate readout of the spin of the electronic state of a single paramagnetic Group V endohedral molecule. These are molecules that consist of a Group V atom trapped within a fullerene carbon cage. The project will investigate performing electronic spin detection directly on the endohedrals using MRFM and Nano SQUID techniques. In addition, we will investigate readout systems which are specifically tailored for optimal single-electron spin detection in STM-ESR and Single Molecule Spectroscopy (SMS), as well as MRFM and Nano SQUID. These will be, organic free radicals, molecular magnets and nano-crystalline N-V colour centers in Diamond. The project will also investigate the coupling of these separate readout systems to the endohedrals, both chemically and physically, to establish an indirect method of reading out the spin state of the single endohedral. We will also investigate an electro-mechanical spin readout via a single molecule fullerene transistor. The second area of the project will investigate the implementation of various single-issue SBSS quantum computing architectures involving Group V endohedrals. We will build on previous designs for a globally addressed (cellular automata), and locally addressed architectures. The project will construct a integrated on-chip ESR microresonator spectrometer which will be specifically suited for small spin samples. In addition we will investigate the possibility of frequency addressing the endohedral spins by the application of ultra-high on-chip magnetic field gradients. The final goal for the project will be to demonstrate few-spin single-issue quantum information processing using the developed readout technology and to further investigate the scalability of both the locally and globally addressed quantum computing architectures

Funding Scheme

CSC - Cost-sharing contracts
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Coordinator

NATIONAL UNIVERSITY OF IRELAND, MAYNOOTH
Address

Maynooth, Co. Kildare
Ireland

Participants (7)

HAHN-MEITNER-INSTITUT BERLIN GMBH
Germany
Address
Glienicker Strasse 100
14109 Berlin
MAX-PLANCK GESELLSCHAFT ZUR FOERDERUNG DER WISSENSCHAFTEN E.V.
Germany
Address
Hofgartenstrasse 8
80539 Muenchen
THE CHANCELLOR, MASTERS AND SCHOLARS OF THE UNIVERSITY OF CAMBRIDGE
United Kingdom
Address
The Old Schools, Trinity Lane
CB21TT Cambridge
THE UNIVERSITY OF QUEENSLAND
Australia
Address

QLD4072 Brisbane, Queensland
UNIVERSITAET DORTMUND
Germany
Address
August-schmidt-strasse 4
44227 Dortmund
UNIVERSITAET STUTTGART
Germany
Address
Keplerstrasse 7
70174 Stuttgart
UNIVERSITY COLLEGE CORK, NATIONAL UNIVERSITY OF IRELAND, CORK
Ireland
Address
Western Road
Cork