1. Design and Characterization of Solid-State Quantum Processors with Slow Decoherence Rates for NMR QIP Len Mueller University of California, Riverside CCF-0432186

2. Quantum Information Processing with Single- Crystal NMR Gate Speed Strong spin-spin dipolar couplings mean faster gate times State Initialization Compatible with low temperature and dynamic nuclear polarization Potential for scalability to larger number of qubits Goal Develop single-crystal NMR as a test-bed for QIP

3. Relaxation and Gate Times Liquid or solution: Cory 2001, Alanine Nielsen 1998, TCE Chuang 2001, 7-qubit Crystal: Mueller 2003, Glycine Interaction Strength (Hz) T 2 (sec) 1 10 100 1000 10000

4. Design and Characterization of Solid-State Quantum Processors with slow Decoherence Rates for NMR QIP Improved hardware New samples and characterization of decoherence 2:1 U- 13 C, 15 N-Glycine 1,5- Naphthalenedisulfonate Dihydrate Co-Crystal

5. 1 H-decoupled 13 C and 15 N Single-Crystal Spectra Dipolar couplings: C  -C O 366 Hz C  -N 1377 Hz C O -N 754 Hz Relaxation times (T 2 ): C , C O 31 ms N95 ms

6. Relaxation vs. Concentration Decoherence is predominantly inhomogenous and follows the van Vleck relation with decoherence rates proportional to concentration Single multiplet components relax up to 4x slower than full multiplet

7. Demonstration of 3 qubit QIP in a single-crystal solid Developed new crystals for next generation QIP in solids Characterized relaxation properties Next: Dynamic Nuclear Polarization, 6 qubit system Accomplishments JCP 119(3), 1643-1649 (2003) Phys Rev A, 69(5-A), 052302/1-9 (2004)