REPORT DOCUMENTATION PAGE I Form Approved OMB NO. 0704-0188 The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggesstions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington VA, 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any oenalty for failing to comply with a collection 01 information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. 1. REPORT DATE (DD-MM-YYYY) 2. REPORT TYPE 3. DATES COVERED (From - To) 16-07-2009 Final Report 5-Aug-2004 - 30-Nov-2008 4. TITLE AND SUBTITLE 5a. CONTRACT NUMBER Solid State Quantum Computing using Spin Qubits in Silicon W911NF-04-1-0389 Quantum 5b. GRANT NUMBER Dots (QCCM) 5c. PROGRAM ELEMENT NUMBER 6. AUTHORS 5d. PROJECT NUMBER Mark Eriksson, Max Lagally, Mark Friesen, Susan Coppersmith, Robert Joynt, Robert Blick, Alex Rimberg, Stephen Lyon, Paul von Allmen, 56.1 'frog( NUMBER Gerhard Klimeck 551 UNIT NUMBER 7. PERFORMING ORGANIZATION NAMES AND ADDRESSES 8. PERFORMING ORGANIZATION REPORT University of Wisconsin - Madison NUMBER The Board of Regents of the OW System 21 N. Park Street Madison, WI 53715 -1218 9. SPONSORlNGIMONITORlNG AGENCY NAME(S) AND 10. SPONSORIMONITOR'S ACRONYM(S) ADDRESS(ES) ARO U.S. Army Research Office 11. SPONSORIMONITOR'S REPORT P.O. Box 12211 NUMBER(S) Research Triangle Park, NC 27709-2211 46260-PH-OC.67 12. DISTRIBUTION AVAILIBILITY STATEMENT Approved for public release; Distribution Unlimited 13. SUPPLEMENTARY NOTES The views, opinions and/or findings contained in this report are those of the author(s) and should not contrued as an official Department of the Army position, policy or decision, unless so designated by other documentation. 14. ABSTRACT The project goals are to fabricate qubits in quantum dots in Si/SiGe modulation-doped heterostructures, to characterize and understand those structures, and to develop the technology necessary for a Si/SiGe quantum dot quantum computer. The physical qubit in our approach is the spin of an electron confined in a top-gated silicon quantum dot in a Si/SiGe modulation-doped heterostructure. Operations on such a qubit may be performed by controlling the voltages on gates in-between neighboring quantum dots. A quantum computer and qubits in silicon 15. SUBJECT TERMS quantum computing, qubits, silicon devices, quantum dots, spins, valley splitting, quantum point contact, decoherence, single electron transistor, spin blockade 16. SECURITY CLASSIFICATION OF: 17. LIMITATION OF 15. NUMBER 19a. NAME OF RESPONSIBLE PERSON a. REPORT b. ABSTRACT c. THIS PAGE ABSTRACT OF PAGES Mark Eriksson U U U SAR 19b. TELEPHONE NUMBER 608-262-2281 Standard Fonn 298 (Rev 8/98) Prescribed by ANSI Std. Z39.18