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Equilibrium Noise Suppression by Modulating Contact Transparency

Equilibrium Noise Suppression by Modulating Contact Transparency Y. B. Sherkunov, Jin Zhang, N. d'Ambrumenil, B. Muzykantskii Department of Physics, University of Warwick, Coventry, CV4 7AL, U.K . A. when. 0. t. ABSTRACT

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Equilibrium Noise Suppression by Modulating Contact Transparency

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  1. Equilibrium Noise Suppression by Modulating Contact Transparency Y. B. Sherkunov, Jin Zhang, N. d'Ambrumenil, B. Muzykantskii Department of Physics, University of Warwick, Coventry, CV4 7AL, U.K. A when 0 t ABSTRACT Controlled injection of single electrons into a ballistic conductor is essential for ``moving-electron-based'' quantum computation. 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 two optimal contact opening schemes with the equilibrium noise largely suppressed. The potential applications includes an optimal electronic entangler and on-demand single electron source. Mapping Method for Modulating Contact Transparency Single Electron Source No bias-voltage Real Transmission and Reflection Amplitudes A(t) and B(t) Total noise due to MES: Scattering Matrix Approach , 2 independent channels with Probability For , (Direct analog to MES, see grey box) Non-Optimal Opening Arbitrary Switching: Extra noise due to finite time cut-off tf EntanglerSource Optimal Electronic Entangler Noise Minimization for QPC? Minimal Excitation States (MES) 1,2 Arbitrary Pulse Lorentzian Pulse (L.P.) Spin Entanglement: Faraday Flux: Not Useful Useful References: Ivanov, Lee, Levitov, Phys. Rev. B 56, 6839 (1997) Keeling, Klich, Levitov, Phys. Rev. Lett. 97, 116403 (2006) Abanov and Ivanov, Phys. Rev. Lett. 100, 086602 (2008) YS, JZ, NdA, BM, arXiv:0812.4433v3 JZ, YS, NdA, BM, in preparation

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