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past deliverables and present work. HMI. FU-Berlin. decoherence in solid state N/P@C 60. http://www.hmi.de/people/carola.meyer/Dissertation. (defence: 14. November). contents. Micro resonator:. Small amounts (~ 5 mg) of quality 10 -3 have been supplied to Uni Dortmund. stability tests:.

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  1. past deliverables and present work HMI FU-Berlin • decoherence in solid state N/P@C60 http://www.hmi.de/people/carola.meyer/Dissertation (defence: 14. November) contents

  2. Micro resonator: Small amounts (~ 5 mg) of quality 10-3 have been supplied to Uni Dortmund stability tests: Small amounts (~ 1 mg) of quality 10-4 to Uni Stuttgart enrichment: average amounts (~ 0.5 g) of quality 10-4 to Uni Dublin No further requests have been received from the partners material supply (D 1.1)

  3. K.-P. Dinse P. Jakes N@C60 - C60 dimer (D 1.2)

  4. D 1.3 (month 12): highly enriched material (>20%) • CTA (BmBF) will start middle of October D 1.4 (month 15): diluted doubly-filled dimers • Postdoc (BmBF) started in September • build-up the production of mechanically synthesised dimer • start chemical route towards dimer • move to FU-Berlin present/future work production and enrichment will stay at HMI until March ‘04

  5. Hrel = Hhf + Hfs + Hdip = IAS + SDS + STR P@C60 N@C60 relaxation rate is determined by: A ~ 15 MHz D ~ 0.5 MHz T ~ 440 kHz A ~ 140 MHz D ~ 14 MHz T ~ 440 kHz • strength of interaction • phonons (DOS), which modulate the interaction spin-lattice relaxation modulation of local B0 causes relaxation

  6. two relaxation rates can be resolved relaxation paths

  7. temperature dependence of hyperfine coupling A harmonic oscillator T > 35K: harmonic oscillator T < 35K: acoustic phonons

  8. P@C60 T > 35 K T < 35 K N@C60 relaxation larger for P@C60 than for N@C60 relaxation depends only on spin concentration model for T1

  9. T1 and scalability for a powder sample with 100% spin concentration T1 ~ 1 ms

  10. P@C60 N@C60 spin-spin relaxation number of single qubit operations at room temperature ~ 50 oscillations at room temperature

  11. P@C60 powder N@C60: T2 = 14 µs temperature dependence P@C60: T2 = 14 µs

  12. in a sample with random distribution of electron spins: • T2 itself is temperature independent • depends on spin concentration P@C60/C60 T2 1 x10-4 1 µs 2.4 x10-5 14 µs 1 x10-6 28 µs T2 and scalability • high dilution limit T2 = ?

  13. Ladd et al., arXiv:quant-ph/0309164 v1 (23.09.03) number of single-qubit gates: WRabi T2 ~ 103 number of two-qubit gates: J max T2 ~ 103 for error correction gain one order of magnitude in T2: • measure T2 at spin concentrations as low as possible (signal/noise) • use pulse sesquences known from NMR for dipolar decoupling our qubit in contest

  14. even in solid state concept T1 ~ ms (worst case) 50 Rabi oscillations at room temperature spin-spin relaxation up to T2 = 28 µs measure coupling (T1) on surface show short two-qubit gates measure T2 in high dilution limit conclusions

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