Experimental Test of the High-Frequency Quantum Shot Noise Theory in a Quantum Point Contact

Abstract

We report on direct measurements of the electronic shot noise of a quantum point contact at frequencies nu in the range 4-8 GHz. The very small energy scale used ensures energy independent transmissions of the few transmitted electronic modes and their accurate knowledge. Both the thermal energy and the quantum point contact drain-source voltage Vds are comparable to the photon energy hnu leading to observation of the shot noise suppression when $V_{ds}<h\nu /e$. Our measurements provide the first complete test of the finite frequency shot noise scattering theory without adjustable parameters.

Version Published in Phys. Rev. Lett. (Phys. Rev. Lett. 99, 236803 (2007))

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• High Frequency Quantum Admittance and Noise Measurement with an On-chip Resonant Circuit
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• Dynamical Coulomb Blockade in an interacting 1D system coupled to an arbitrary environment
• Second-order coherence of microwave photons emitted by a quantum point contact
• Nonequilibirum noise spectrum and Coulomb-blockade-assisted Rabi interference in a double-dot Aharonov-Bohm interferometer
• Nonzero temperature effects on antibunched photons emitted by a quantum point contact out of equilibrium
• Noninvasive Quantum Measurement of Arbitrary Operator Order by Engineered Non-Markovian Detectors
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• Spin-resolved dynamical conductance of correlated large-spin magnetic molecules
• Scattering approach to frequency-dependent current noise in Fabry-Pérot graphene devices
• Single-electron $G^{(2)}$ function at nonzero temperatures
• Universal Property of Quantum Measurements of Equilibrium Fluctuations and Violation of Fluctuation-Dissipation Theorem
• Observation of edge magnetoplasmon squeezing in a quantum Hall conductor
• Macroscopic Quantum Violation of Fluctuation-Dissipation Theorem in Equilibrium
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• Finite-frequency noise in a non-interacting quantum dot
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• Finite frequency noise spectroscopy for fractional Hall states at ν = 5/2
• Robustness of equilibrium off-diagonal current fluctuation against localization of electron states in macroscopic two-dimensional systems
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• Colored ${\Delta }_T$ noise probes the topological character of edge modes