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Low Noise On-demand Single Electron Source

Low Noise On-demand Single Electron Source Jin Zhang, Y. Sherkunov, N. d'Ambrumenil, B. Muzykantskii Department of Physics, University of Warwick, Coventry, CV4 7AL, U.K . (See poster by Y. Sherkunov also). A. 0. t. ABSTRACT

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Low Noise On-demand Single Electron Source

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  1. Low Noise On-demand Single Electron Source Jin Zhang, Y. Sherkunov, N. d'Ambrumenil, B. Muzykantskii Department of Physics, University of Warwick, Coventry, CV4 7AL, U.K. (See poster by Y. Sherkunov also) A 0 t ABSTRACT We obtain the full counting statistics (FCS) of a quantum point contact (QPC) for the case when the contact transparency is modulated in time, which is shown to be equivalent to a system with a time-dependent bias voltage applied between the leads. We demonstrate an improved contact opening schemes with the logarithmically divergent equilibrium noise suppressed, which can be used as an on-demand single electron source. The effect of a possible deviation of the opening is also presented. Low Noise Single Electron Source Non-Quantized Opening Arbitrary Switching: Noise diverges logarithmically: Open the barrier as Noise Minimization for QPC? Noise Characterization Total noise due to an MES: Turn on QPC as: Transmission amplitude: A(t) Scattering Matrix: Density matrix of the incoming states: Full Counting Statistics Probability distribution at : Density matrix of the outgoing states: Faraday Flux: Characteristic Function Noise: Suppressed double electron emission: Diagonalize Hi-yield single electron emission: Classify Noise as: Current, Noise, etc... Noise generated by an MES with w.r.t. temperature (T) for different cut-off : Minimal Excitation States (MES) Arbitrary Pulse Lorentzian Pulse (L.P.) Measurement time: Thermal Noise: Faraday Flux: Zero Temperature Equilibrium Noise: References: [1] JZ, YS, NdA, BM, arXiv:0909.3427 [2] YS, JZ, NdA, BM, Phys. Rev. B 80, 041313(R) (2009) [3] Abanov and Ivanov, Phys. Rev. Lett. 100, 086602 (2008) [4] Keeling, Klich, Levitov, Phys. Rev. Lett. 97, 116403 (2006) [5] Ivanov, Lee, Levitov, Phys. Rev. B 56, 6839 (1997) Particle: Hole: Shot Noise: 0.25

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