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An Electronic Primary Thermometer Based on Thermal Shot Noise

An Electronic Primary Thermometer Based on Thermal Shot Noise. Lafe Spietz, K.W. Lehnert, Irfan Siddiqi, R.J. Schoelkopf Department Of Applied Physics, Yale University Thanks to: Michel Devoret and Dan Prober. Introduction.

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An Electronic Primary Thermometer Based on Thermal Shot Noise

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  1. An Electronic Primary Thermometer Based on Thermal Shot Noise Lafe Spietz, K.W. Lehnert, Irfan Siddiqi, R.J. Schoelkopf Department Of Applied Physics, Yale University Thanks to: Michel Devoret and Dan Prober

  2. Introduction • Thermal-shot noise in tunnel junctions: a voltage-dependent combination of Johnson noise and shot noise • Relates T and V using only e and kB • Demonstration of functional form for tunnel junction T=800 mK to >10 K

  3. Fundamental Noise Sources Johnson-Nyquist Noise • Frequency-independent • Temperature-dependent • Used for thermometry Shot Noise • Frequency-independent • Temperature independent

  4. Conduction in Tunnel Junctions M I M Difference gives current: Assume: Tunneling amplitudes and D.O.S. independent of Energy

  5. Thermal-Shot Noise of a Tunnel Junction* Sum gives noise: *D. Rogovin and D.J. Scalpino, Ann Phys. 86,1 (1974)

  6. Thermal-Shot Noise of a Tunnel Junction 2eI Shot Noise Transition Region eV~kBT 4kBT Johnson Noise R

  7. Tunnel Junction: Dolan Bridge Fabrication Dolan Resist Bridge(SEM) Al-AlOX-Al Junction(AFM)

  8. The Measurement For t= 1 second

  9. Self-Calibration Technique for Thermometry P = GB( SIAmp+SI(V,T) )

  10. Comparison of normalized data to functional form over wide range Normalized Data

  11. Merits Vs. Complications *R. J. Schoelkopf et al., Phys Rev. Lett. 80, 2437 (1998)

  12. Summary • New Tunnel Junction Thermometer based on voltage and temperature dependent noise of a tunnel junction (thermal-shot noise.) • Fast, accurate thermometer • works over a wide temperature range • Relates T to V using only e and kb implications for metrology

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