A Science & Technology Center Physics Department, UC Berkeley Materials Sciences Division, LBNL IRFAN SIDDIQI 2 nd Annual E 3 S Retreat Berkeley, CA, August 29, 2011 Spin Ensembles & Ultrasensitive Spin Readout
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A Science & Technology Center
Physics Department, UC Berkeley Materials Sciences Division, LBNL
IRFAN SIDDIQI
2nd Annual E3S Retreat
Berkeley, CA, August 29, 2011
Spin Ensembles
&
Ultrasensitive Spin Readout
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- A Private Meeting
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OUTLINE
Operation of Nanosquid magnetometers
RF readout of spin diffusion currents
Resonant readout of diamond NV spin ensembles
2
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JOSEPHSON TUNNEL
JUNCTION
SQUID Superconducting QUantum Interference Device
I0 I0
SQUID
I0 I0 F
Flux tunable nonlinear inductor
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Page 4
Date (Eli Levenson-Falk)
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MICROWAVE READOUT
• Non-dissipative measurement!
• Flux transduction & amplification!
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Page 6
Date
SQUIDOLOGY
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SPIN CURRENTS: TIME DYNAMICS
• Measure RF Voltage • Measure Time Varying Flux
SWITCHING MECHANISM
ENERGY BUDGET
Behin-Aein et. al. , Nature Nano 5, 266 , (2011)
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RESONANT READOUT OF SPIN ENSEMBLES
Date
• Memory
• Quantum Computation
• Classical Computation ?
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BULK DIAMOND NV Meander Resonator (Niobium)
NV Sample
Resonator Chip
2 mm
Bulk NV sample: 1.5x1018 cm-3
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SPIN LINEWIDTH
Sample* Concentration (NVs/cm^3)
Spin Linewidth Coupling
S6 1.5 x 10^18 5.4 MHz 2.8 MHz
S8 5.5 x 10^16 5.6 MHz 136 kHz
B2 ~1.5 x 10^18 8.3 MHz 2.3 MHz
* V. Acosta et al., Phys. Rev. B 80, 1-15 (2009).
= cavity half linewidth C = cavity intrinsic linewidth
gS = spin linewidth D = magnetic field detuning
(
GH
z)
Spin frequency (GHz)
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CLASSICAL LOGIC ?
• Resources for error correction ?
Classical Boolean logic gates with quantum systems N Renaud1 and C Joachim Nanoscience Group and MANA Satellite CEMES/CNRS, 29 rue J Marvig, BP 94347, 31055 Toulouse Cedex, France 1 Present address: Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA
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ACKNOWLEDGEMENTS
Date
Dr. O. Naaman (Northrop-Grumann)
Dr. E. Hoskinson (D-Wave)
Dr. R. Vijay Dr. K. Murch Dr. A. Schmidt
D.H. Slichter E.M. Levenson-Falk N. Henry C. Macklin N. Antler S. Weber
Y.-D. Sun R. Naik A. Narla Z. Minev
Quantum Nanoelectronics Laboratory
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FUTURE WORK
• Measure spin dynamics in diffusion structures
• Investigate spin linewidth in bulk NV structures
- quantify loss due to dipolar coupling
- quantify loss due to bulk defects
- quantify loss due to surface defects
• Fabricate/test resonant structures on diamond substrates
- selective implantation (T. Schenkel, LBNL)
• Investigate other spin systems - Bi:Si (T. Schenkel, LBNL)
- Ruby (D.M. Stamper-Kurn)
Date
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