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Low Noise Single Electron Source Jin Zhang, Yury Sherkunov, Nicholas d’Ambrumenil, Boris Muzykantskii University of Warwick, U.K. Conference on Computational Physics 2009, Kaohsiung, 16 th, Dec.
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Single Electron Excitation Arbitrary Pulse:
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Single Electron Excitation Minimal Excitation States (MES): Ivanov Lee Levitov, Phys. Rev. B 56, 6839 Keeling Klich Levitov, Phys. Rev. Lett. 97, 116403
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Noise Characterization Partition Noise: Thermal Noise: Equilibrium Noise (T=0): DD 0 t D
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Noise Minimization Minimized by setting 0 D t for abrupt opening at GHz 0 t D D Low temperature -- mK High frequency -- GHz
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Suppression of the Equilibrium Noise 1. Single Lorentzian pulse to the barrier 2. Double Lorentzian pulses to the barrier When 0.8
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Low Noise Single Electron Source Total noise from single electron emission: JZ YS NdA BM Phys. Rev. B 80, 245308 Phys. Rev. B 80, 041313 (R) Probability Distribution: High yield single electron emission Suppressed multiple electron emission
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Conclusion Suppressing the quantum equilibrium noise at low temperature by tuning the tunneling barrier (QPC) transparency Low noise on-demand single electron source at low temperature Many thanks for your attention!
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Single Electron Source Fève et.al, Science 316,1169 Averaged over millions of events Too Noisy Working Condition: GHz, mK Keeling et.al, PRL 101, 196404 Minimize the Noise?
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Optimal Electronic Entangler Apply Single Lorentzian pulse to the barrier “useful”, Not “useful” No excessive not “useful” noise at all 50% Entanglement efficiency, Theoretical maximum
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Theory of Full Counting Statistics (I) Characteristic Function Current, Noise, etc... Understood with density matrix of outgoing states:
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Theory of Full Counting Statistics (II) Abanov et.al 2008
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Non Optimal Pulses For finite cut-off, additional noises are induced
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Noise Characterization D Shot Noise: Equilibrium Noise:
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